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Articles 9181 - 9210 of 294494

Full-Text Articles in Physical Sciences and Mathematics

Sensitivity Analysis Of Factors Influencing Water Redistribution In Vadose Zones Under Coal Mining Disturbance In Ecologically Vulnerable Areas, Wang Ao, Liu Shiliang, Wang Shanlin, Zheng Yusheng, Wang Tengye, Wang Zuzhen, Mao Deqiang Dec 2025

Sensitivity Analysis Of Factors Influencing Water Redistribution In Vadose Zones Under Coal Mining Disturbance In Ecologically Vulnerable Areas, Wang Ao, Liu Shiliang, Wang Shanlin, Zheng Yusheng, Wang Tengye, Wang Zuzhen, Mao Deqiang

Coal Geology & Exploration

Objective Coal mining-induced disturbance leads to water redistribution in the vadose zones of mining areas. The sensitivity analysis of the factors influencing this redistribution holds critical significance for the reconstruction of eco-geological environments and the sustainable economic development in mining areas. Methods Against the engineering background of the Yushen mining area characterized by wind-blown sandy terrain in northern Shaanxi Province, this study analyzed the primary factors influencing water redistribution in the vadose zone under coal mining disturbance. Accordingly, 18 COMSOL Multiphysics numerical models for water redistribution in the vadose zone under coal mining disturbance were constructed through orthogonal experiments. Using …

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Simulation Of Groundwater Flow Field Evolution And Water Inrush Risks Under The Deep-Well Reinjection Of High-Tds Mine Water, Liu Qi, Sun Yajun, Fan Jianguo, Tan Xianfeng, Xiao Shengxin, Yang Chuanwei, Chen Weiyang, Chen Ge Dec 2025

Simulation Of Groundwater Flow Field Evolution And Water Inrush Risks Under The Deep-Well Reinjection Of High-Tds Mine Water, Liu Qi, Sun Yajun, Fan Jianguo, Tan Xianfeng, Xiao Shengxin, Yang Chuanwei, Chen Weiyang, Chen Ge

Coal Geology & Exploration

Objective The deep-well reinjection of mine water results in a regional groundwater level rise to varying degrees, possibly inducing hydrogeological hazards such as floor water inrushes or water inrushes along faults. In this context, determining the evolutionary pattern of the groundwater flow field under long-term mine water reinjection and conducting reinjection safety assessments play a critical role in ensuring both the safety of mine water reinjection and water conservation-based coal mining.Methods This study examined the reinjection of mine water in a coal mine within the Juye coalfield, North China. Based on the geological conditions for mine water reinjection in …

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Current Status And Future Trend Of Research On Underground Borehole Measurement Technology For Coal Mines, Chen Long, Yang Dongdong, Li Quanxin, Chu Zhiwei, Zhang Jiguan, Chen Xiang Dec 2025

Current Status And Future Trend Of Research On Underground Borehole Measurement Technology For Coal Mines, Chen Long, Yang Dongdong, Li Quanxin, Chu Zhiwei, Zhang Jiguan, Chen Xiang

Coal Geology & Exploration

Background Underground borehole measurement emerges as a core technology for the safe production of coal mines. Its multi-parameter measurements, data accuracy, data transmission rate, and reliability directly influence the timeliness of early warning for disasters, the operating stability of instruments, the accuracy of borehole assessment, and the scientific rigor of intelligent decision-making under complex deep geological conditions. Advances So far, the measurement while drilling (MWD) and post-drilling borehole visualization techniques have developed into a diversified technological system. Specifically, the MWD technique has achieved a leap from wireline to wireless transmission, obviating the reliance on wireline drill rods in traditional measurement …

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An Automated Attitude Control Method For The Rotary Steerable System And Its Validation Through Hardware-In-The-Loop Simulation, Zhang Nan, Ren Bai’An, Li Fei, Liu Ziqi, Lyu Fangxing Dec 2025

An Automated Attitude Control Method For The Rotary Steerable System And Its Validation Through Hardware-In-The-Loop Simulation, Zhang Nan, Ren Bai’An, Li Fei, Liu Ziqi, Lyu Fangxing

Coal Geology & Exploration

Objective The traditional manual control mode of a rotary steerable system (RSS) faces challenges, including response delay and low control efficiency. To address these challenges, this study proposed a closed-loop automated attitude control method for the RSS and verified its effectiveness through hardware-in-loop (HIL) simulation. Methods This study focuses on the drilling process of a point-the-bit RSS. In the case of deviations between measured and target attitudes, the control parameters were calculated based on the deviation signals using a closed-loop controller, driving the RSS actuator to conduct trajectory correction. Afterward, the actual attitude was yielded and then entered the input …

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Co2-Water Displacement Characteristics Of Saturated Sandstones With Different Pore Structures, Liu Ting, Li Jinglin, Li Yi, Dan Wendong, Diao Yujie, Ma Xin Dec 2025

Co2-Water Displacement Characteristics Of Saturated Sandstones With Different Pore Structures, Liu Ting, Li Jinglin, Li Yi, Dan Wendong, Diao Yujie, Ma Xin

Coal Geology & Exploration

Objective The pore structures of clastics play a crucial role in assessing the potential of saline aquifers for geologic CO2 sequestration. Current studies on pore structures during CO2 sequestration focus primarily on artificial cores. However, compared to artificial cores, natural cores feature more complex pore size distributions and stronger heterogeneity. Methods This study examined a natural core from deep reservoirs in the Ordos Basin and two artificial cores with different porosities through CO2-water displacement experiments under water-saturated conditions. Using a nuclear magnetic resonance (NMR) analysis and imaging system for multiphase fluid displacement, this study analyzed the …

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Multi-Field Coupling-Based Numerical Simulations Of Co2 Storage In Saline Aquifers: A Case Study Of The Dingji Coal Mine, Huainan Mining Area, Li Dianshang, Zheng Sijian, Liao Qingfa, Miao Wei, Tian Yuchen, Zhang Helong, Liu Yanzhi, Liu Shiqi Dec 2025

Multi-Field Coupling-Based Numerical Simulations Of Co2 Storage In Saline Aquifers: A Case Study Of The Dingji Coal Mine, Huainan Mining Area, Li Dianshang, Zheng Sijian, Liao Qingfa, Miao Wei, Tian Yuchen, Zhang Helong, Liu Yanzhi, Liu Shiqi

Coal Geology & Exploration

Background Saline aquifers are characterized by extensive distribution, abundant reserves, and substantial potential for CO2 storage, establishing them as the most promising geological media for carbon capture, utilization, and storage (CCUS). CO2 storage in saline aquifers plays a crucial role in mitigating the greenhouse effect and achieving the goals of peak carbon dioxide emissions and carbon neutrality. Thoroughly investigating CO2 storage in deep saline aquifers within the Huainan mining area helps alleviate the regional pressure of carbon emission reduction while also providing important support for expanding the technical pathways of CCUS and promoting its engineering applications. Methods …

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Environmental Risk Assessment Of Co2 Storage Combined With The Overlying Coal Mining, Gu Leiyu, Li Wenhui, Huang Wei, Zhou Quanchao, Zhu Yalong, Li Xiaying, Liu Guizhen, Li Qi Dec 2025

Environmental Risk Assessment Of Co2 Storage Combined With The Overlying Coal Mining, Gu Leiyu, Li Wenhui, Huang Wei, Zhou Quanchao, Zhu Yalong, Li Xiaying, Liu Guizhen, Li Qi

Coal Geology & Exploration

Objective Carbon capture, utilization, and storage (CCUS) technology serves as a key method for carbon neutrality. However, large-scale engineering applications of CCUS are still confronted with serious challenges of environmental risks. Therefore, systematic environmental risk assessment plays an essential role in ensuring the environmental safety and social acceptability of CO2 geological storage projects. Methods Targeting the CO2 geological storage project combined with overlying coal mining in Zhengning County, Gansu Province, this study performed the environmental risk assessment of CO2 leakage based on the requirements of the Technical Guideline on Environmental Risk Assessment for Carbon Dioxide Capture, Utilization, …

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Advances In Research On The Policies, Technologies, And Demonstration Projects Of Geologic Co2 Sequestration In China, Zhao Yue, Yang Xuechao, Chen Xiaodong, Chang Jia, Wei Hengfei, Liu Zhibang, Liu Hui Dec 2025

Advances In Research On The Policies, Technologies, And Demonstration Projects Of Geologic Co2 Sequestration In China, Zhao Yue, Yang Xuechao, Chen Xiaodong, Chang Jia, Wei Hengfei, Liu Zhibang, Liu Hui

Coal Geology & Exploration

Background Carbon capture, utilization, and storage (CCUS) is considered a key technology to promote large-scale carbon dioxide (CO2) emission reduction. Against the backdrop of achieving its goals of carbon neutrality and peak carbon dioxide emissions, China faces a tremendous challenge of CO2 emission reduction. This situation will provide new driving forces for the development of geologic CO2 sequestration while also imposing higher requirements for technical innovation and industrialization of the technology. Methods and Advances This study systematically reviews the development process of policies on CCUS of China over the past two decades, with over 30 policies …

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Mechanisms Governing Co2 Mineral Trapping And Cementitious Activity Degradation Of Solid Waste-Based Backfill Materials, Liu Zhifei, Chen Qingting, Li Hongjie, Wang En, Zhao Heming Dec 2025

Mechanisms Governing Co2 Mineral Trapping And Cementitious Activity Degradation Of Solid Waste-Based Backfill Materials, Liu Zhifei, Chen Qingting, Li Hongjie, Wang En, Zhao Heming

Coal Geology & Exploration

Objective This study investigated three types typical alkaline industrial solid waste: steel slag, fly ash, and bottom ash, highlighting the differences in their CO2 mineral trapping efficiency and the degradation patterns of their cementitious activity after carbon fixation. The purpose is to reveal the mechanisms underlying CO2 mineral trapping in solid waste and evaluate their application potential in backfill engineering, thereby promoting the synergistic development of industrial solid waste recycling and carbon emission reduction. Methods Through experiments on CO2 mineral trapping using the direct wet method, the kinetics and product characteristics of solid waste-CO2 interactions were …

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Impacts Of Anti-Rock Burst Multistage Hydraulic Fracturing Using Horizontal Wells On Mining Roadways And Fracture Control Techniques: A Case Study Of Mining Facein The Zhaoxian Coal Mine, Shaanxi Province, Liu Xiugang, Jiang Zaibing, Yang Juan, Liu Mingjun, Pang Tao, Wu Weixing, Tu Xiaolong, Mo Haitao, Guo Xiaolong, Du Xinfeng Dec 2025

Impacts Of Anti-Rock Burst Multistage Hydraulic Fracturing Using Horizontal Wells On Mining Roadways And Fracture Control Techniques: A Case Study Of Mining Facein The Zhaoxian Coal Mine, Shaanxi Province, Liu Xiugang, Jiang Zaibing, Yang Juan, Liu Mingjun, Pang Tao, Wu Weixing, Tu Xiaolong, Mo Haitao, Guo Xiaolong, Du Xinfeng

Coal Geology & Exploration

Objective Surface multistage hydraulic fracturing of hard roofs using horizontal wells serves as an important technique for rock burst control in mines. However, fracturing technique under improper control might pose adverse impacts on excavated mining roadways underground, causing roadway deformation, mesh failure with block falling, and the flow of fracturing fluids into the roadways. Methods This study investigated certain mining face of the Zhaoxian Coal Mine in the Yonglong mining area, Shaanxi Province. Targeting different characteristics and phenomena of roadways following hydraulic fracturing, this study analyzed the reasons why fracturing fluids flowed into roadways during hydraulic fracturing using theoretical analysis, …

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Lithofacies Paleogeography Of The Ordovician Kelimoli-Lashizhong Formations Along The Western Margin Of The Ordos Basin, Wang Weibin, Ma Zhanrong, Hu Aiping, Zhang Qian, Li Wenhou, Chen Qiang, Ma Yao, Wang Yanbo Dec 2025

Lithofacies Paleogeography Of The Ordovician Kelimoli-Lashizhong Formations Along The Western Margin Of The Ordos Basin, Wang Weibin, Ma Zhanrong, Hu Aiping, Zhang Qian, Li Wenhou, Chen Qiang, Ma Yao, Wang Yanbo

Coal Geology & Exploration

Objective The period during the deposition of the Middle-Late Ordovician Kelimoli-Lashizhong formations witnessed a key transition of the tectonic framework along the western margin of the Ordos Basin. Investigating the lithofacies paleogeography of these formations can reveal the tectono-sedimentary responses during this period, thereby providing a basis for the resource potential prediction, exploration, and exploitation of natural gas in the study area. Methods Using field section observations, core observations, and log interpretations, as well as previous research results, this study comprehensively analyzed the Middle-Late Ordovician strata in the Ordos Basin from the perspectives of stratigraphy, sedimentary system division, and sedimentary …

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Physical Simulation Experiments On 4d Visualization Of Dynamic Methane Diffusion And Adsorption In Low-Porosity And Low-Permeability Coals, Liu Tong, Jiao Baizhuo, Lin Baiquan, Sang Shuxun, Yang Wei, Liu Shiqi, Liu Ting, Li He, Yang Mingxing Dec 2025

Physical Simulation Experiments On 4d Visualization Of Dynamic Methane Diffusion And Adsorption In Low-Porosity And Low-Permeability Coals, Liu Tong, Jiao Baizhuo, Lin Baiquan, Sang Shuxun, Yang Wei, Liu Shiqi, Liu Ting, Li He, Yang Mingxing

Coal Geology & Exploration

Objective and Method The diffusivity of methane (CH4) in coal seams significantly influences the surface extraction of coalbed methane (CBM) and underground gas drainage. However, the visualized characterization of the diffusion and migration processes of CH4 in coals remains challenging. To address this issue, this study systematically demonstrated the similarity between krypton (Kr) and CH4 in their adsorption and diffusion behavior in coals. Utilizing Kr—a gas with high X-ray attenuation—as a tracer substitute for CH4, this study achieved the transparent observation of the dynamic gas migration process in low-porosity, low-permeability, and heterogeneous coals using …

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Mechanisms Underlying Sodium Enrichment In Coals In The Dananhu Mining Area, Turpan-Hami Basin, Qi Zhenghui, Sun Fanxing, Wang Wenlong, Huang Chunhui, Liang Kaihua, Huang Yangyang, Shao Longyi Dec 2025

Mechanisms Underlying Sodium Enrichment In Coals In The Dananhu Mining Area, Turpan-Hami Basin, Qi Zhenghui, Sun Fanxing, Wang Wenlong, Huang Chunhui, Liang Kaihua, Huang Yangyang, Shao Longyi

Coal Geology & Exploration

Background The Dananhu mining area boasts abundant coal resources, serving as a significant coal-fired power generation base in Xinjiang, China. However, the high sodium (Na) content in coals within the mining area tends to cause fouling and slagging during coal combustion, severely affecting the clean and efficient utilization of coal resources in the area. Methods and Results epresentative samples collected from the major mineable coal seams were subjected to proximate and ash-composition analyses. The analytical results show that the coal samples had low ash and sulfur contents and high volatile content. SiO2 predominated in the ash components, followed by …

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Mechanisms Behind Soil Water Evaporation And Infiltration During Long-Term Microbial Reclamation In Coal Mining-Induced Subsidence Areas In Northern Shaanxi Province, China, Ke Zengming, Bi Yinli, Yang Wei Dec 2025

Mechanisms Behind Soil Water Evaporation And Infiltration During Long-Term Microbial Reclamation In Coal Mining-Induced Subsidence Areas In Northern Shaanxi Province, China, Ke Zengming, Bi Yinli, Yang Wei

Coal Geology & Exploration

Background Water scarcity is identified as an important factor restricting ecological restoration in arid and semi-arid mining areas. The application of microbial reclamation technologies, especially inoculation with Arbuscular mycorrhizal fungi (AMF), has achieved encouraging ecological effects in mining areas. In this case, investigating soil water movement and its controlling factors in mining areas undergoing long-term microbial reclamation is a key scientific issue for understanding the long-term ecological restoration mechanisms of AMF. Methods This study investigated the microbial reclamation base in the coal mining-induced subsidence area of the Daliuta coal mine of northern Shaanxi Province, located in the middle reaches of …

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Water Quality Characteristics And Reutilization Of Goaf Water From Shallow Coal Seams Within The Datong Mining Area, Shanxi Province, China, Li Jun, Gui Herong, Ding Pengfei, Chen Yongqing, Wan Heyong, Li Weiqi, Huang Dawei, Peng Weihua, Hu Yang, Guo Yan Dec 2025

Water Quality Characteristics And Reutilization Of Goaf Water From Shallow Coal Seams Within The Datong Mining Area, Shanxi Province, China, Li Jun, Gui Herong, Ding Pengfei, Chen Yongqing, Wan Heyong, Li Weiqi, Huang Dawei, Peng Weihua, Hu Yang, Guo Yan

Coal Geology & Exploration

Objective The Datong mining area in Shanxi Province of China faces serious threats from goaf water hazards, while the goaf water drainage is constrained by environmental protection policies. Therefore, the reutilization of goaf water serves as an effective approach to eliminating mine water hazards, protecting water environments, and mitigating water scarcity in the mining area. Methods This study investigated goaf water from shallow coal seams in the Datong mining area. Based on water quality assessment theories and a range of hydrogeochemical indices, including saturation index (SI), chloro-alkaline index (CAI), and sodium adsorption ratio (SAR), this study conducted a joint determination …

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Advances In Research And Future Prospects Of Borehole Geophysical Prospecting Technology For Coal Mines, Li Ping, Wei Rong, Fan Tao, Zhao Rui, Jiang Bici, Tian Xiaochao, Wang Bingchun Dec 2025

Advances In Research And Future Prospects Of Borehole Geophysical Prospecting Technology For Coal Mines, Li Ping, Wei Rong, Fan Tao, Zhao Rui, Jiang Bici, Tian Xiaochao, Wang Bingchun

Coal Geology & Exploration

Background Borehole geophysical prospecting technology for coal mines integrates the advantages of both drilling and geophysical prospecting. Accordingly, multiple critical advances have been achieved in its applications to the technologies and equipment for intelligent coal mining in recent years, enabling long-distance, relatively high-precision geological exploration. This technology plays an increasingly important role in a range of fields, including deep mineral resource exploration and the reconnaissance surveys of hidden disaster-causing factors, providing robust support for safe and efficient coal mining. Advances This study systematically reviews the development history of borehole geophysical prospecting technology, elaborating advances in research on the methodology, theories, …

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Application Of Seismic-While-Tunnelling Detection In The Identification Of Densely Distributed Sub-Seismic Faults, Li Haodang, Li Kang, Chen Jian, Song Xiaozhong, Jin Dan, Wang Baoli Dec 2025

Application Of Seismic-While-Tunnelling Detection In The Identification Of Densely Distributed Sub-Seismic Faults, Li Haodang, Li Kang, Chen Jian, Song Xiaozhong, Jin Dan, Wang Baoli

Coal Geology & Exploration

Objective and Method Densely distributed sub-seismic faults have emerged as a major hidden disaster-causing geological factor, heavily influencing both the production efficiency and operational safety of coal mines. To achieve precise advance detection of underground sub-seismic faults in coal mines, this study designed a geological model. Using seismic-while-tunneling (SWT) advance detection technology for roadways of coal mines, this study investigated the geological situation of sub-seismic faults through forward modeling. Furthermore, it explored the seismic image characteristics of these faults obtained using the SWT observation system under varying survey line lengths and geophone spacing values. Results and Conclusions The forward modeling …

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Real-Time Production Of High-Resolution, Gap-Free, 3-Hourly Aod Over South Korea: A Machine Learning Approach Using Model Forecasts, Satellite Products, And Air Quality Data, Seoyeon Kim, Youjeong Youn, Menas Kafatos, Jaejin Kim, Wonsik Choi, Seung Hee Kim, Yangwon Lee Dec 2025

Real-Time Production Of High-Resolution, Gap-Free, 3-Hourly Aod Over South Korea: A Machine Learning Approach Using Model Forecasts, Satellite Products, And Air Quality Data, Seoyeon Kim, Youjeong Youn, Menas Kafatos, Jaejin Kim, Wonsik Choi, Seung Hee Kim, Yangwon Lee

Institute for ECHO Articles and Research

Aerosol optical depth (AOD) is essential for air quality monitoring and climate research. However, satellite-based retrievals suffer from cloud-related data gaps, and reanalysis products are limited by coarse spatial resolution and substantial production latency. This study develops a real-time, gap-free, high-resolution (1.5 km) AOD retrieval system for South Korea. The system integrates Copernicus Atmosphere Monitoring Service (CAMS) forecasts, high-resolution meteorological fields, and ground-based air quality observations within a machine learning framework. Three models with varying training periods were systematically evaluated using cross-validation and independent validation with 2024 Aerosol Robotic Network (AERONET) data. The optimal model, trained on 2015–2023 data, achieved …

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The Aurora Survey: Robust Helium Abundances At High Redshift Reveal A Subpopulation Of Helium-Enhanced Galaxies In The Early Universe, Danielle A. Berg, Ryan L. Sanders, Alice E. Shapley, Michael W. Topping, Naveen A. Reddy, Evan D. Skillman, Erik Aver, Fergus Cullen, Callum T. Donnan, James S. Dunlop, Tucker Jones, Ali Ahmad Khostovan, Derek J. Mcleod, Desika Narayanan, Pascal A. Oesch, Anthony J. Pahl, Max Pettini, N. M. Förster Schreiber, Daniel P. Stark Dec 2025

The Aurora Survey: Robust Helium Abundances At High Redshift Reveal A Subpopulation Of Helium-Enhanced Galaxies In The Early Universe, Danielle A. Berg, Ryan L. Sanders, Alice E. Shapley, Michael W. Topping, Naveen A. Reddy, Evan D. Skillman, Erik Aver, Fergus Cullen, Callum T. Donnan, James S. Dunlop, Tucker Jones, Ali Ahmad Khostovan, Derek J. Mcleod, Desika Narayanan, Pascal A. Oesch, Anthony J. Pahl, Max Pettini, N. M. Förster Schreiber, Daniel P. Stark

Physics Faculty Scholarship

We present the first robust helium (He) abundance measurements in star-forming galaxies at redshifts 1.6 ≲ z ≲ 3.3 using deep, moderate-resolution JWST/NIRSpec spectroscopy from the AURORA survey. We establish a high-z He sample consisting of 20 galaxies with multiple high-signal-to-noise-ratio (>5σ) He i emission-line detections, including the critical near-infrared λ10833 line. This is the first study at high redshift leveraging λ10833 to break degeneracies between temperature, electron density, optical depth, and He+/H+, enabling reliable He abundance determinations in the early Universe. We use a custom Markov Chain Monte Carlo framework incorporating direct-method electron …

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Numerical Simulation Analysis On Support Performance Of Inclined-Vertical Combined Double-Row Interlocked Steel Pipe Piles, Zhou Yi, Zhang Ning, Wang Yanhua, Zhou Dequan Dec 2025

Numerical Simulation Analysis On Support Performance Of Inclined-Vertical Combined Double-Row Interlocked Steel Pipe Piles, Zhou Yi, Zhang Ning, Wang Yanhua, Zhou Dequan

Journal of China & Foreign Highway

To select appropriate support structures in foundation pit engineering of underground tunnels for the Hong Kong International Airport (HKIA ),this paper proposed the use of inclined-vertical combined interlocked steel pipe piles,which are beneficial for support,water isolation,and recovery.Numerical simulations were conducted using finite element software Midas GTS NX to analyze the effect of different combination types and inclination angles on the engineering response of the inner-row piles of inclined-vertical combined double-row interlocked steel pipe piles.The results show that the inclined-vertical combined double-row piles reduce the horizontal displacement at the top of the inner-row piles by approximately 50% and decrease the peak …

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Influence Mechanism Of Static And Dynamic Loading On Adsorbed Bound Water And Deformation In High Liquid Limit Soils, Fang Zhongwang, Zhou Shiji E, Xiao Yupeng, Peng Xin, Zhang Rui Dec 2025

Influence Mechanism Of Static And Dynamic Loading On Adsorbed Bound Water And Deformation In High Liquid Limit Soils, Fang Zhongwang, Zhou Shiji E, Xiao Yupeng, Peng Xin, Zhang Rui

Journal of China & Foreign Highway

In order to reveal the evolution law of adsorbed bound water and the deformation characteristics of high liquid limit soil under static and dynamic loading,Hainan high liquid limit soil and Hunan clayey sand were selected as comparative samples.Through consolidation,consolidation-creep,and dynamic triaxial tests,the deformation patterns of high liquid limit soil under different loading conditions were obtained.By combining nuclear magnetic resonance tests,the variation pattern of adsorbed bound water content in specimens before and after the consolidation and dynamic triaxial tests was studied.The results show that under static loading,the compression coefficient of high liquid limit soil meets the requirements of the Specifications for …

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Utilization Technology And Compaction Quality Control Of Hardened Layer In Beam Yard Of Rock-Filled Roadbed, Cheng Xiaoliang, Tian Wendi, Gao Mengke, Zhou Xujia Dec 2025

Utilization Technology And Compaction Quality Control Of Hardened Layer In Beam Yard Of Rock-Filled Roadbed, Cheng Xiaoliang, Tian Wendi, Gao Mengke, Zhou Xujia

Journal of China & Foreign Highway

To investigate the utilization technology and compaction quality control of hardened layers in the beam yard of rock-filled roadbed,the optimization design and construction control methods for rock-filled roadbed under different conditions were proposed based on a highway project in Guangdong Province.When the elevation of the hardened layer was lower than the top surface elevation of the roadbed and the top surface bending and settlement value of the hardened layer was less than that of the rock-filled roadbed,the gravel material could be filled directly on the hardened layer to the top surface elevation of the roadbed,and acceptance and pavement design could …

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Shaking Table Test And Numerical Simulation Of Seismic Response Characteristics Of Rock Slope With Muddy Interlayer, Duan Chenggang, Fang Yanlin, Tian Yeqing, Zhou Zhijun Dec 2025

Shaking Table Test And Numerical Simulation Of Seismic Response Characteristics Of Rock Slope With Muddy Interlayer, Duan Chenggang, Fang Yanlin, Tian Yeqing, Zhou Zhijun

Journal of China & Foreign Highway

In order to study the seismic macroscopic failure process and dynamic response characteristics of rock slope with muddy interlayer and reveal the influence of muddy interlayer on slope stability,a similar slope model with concave and convex slope types was designed,and shaking table test was carried out;finite element analysis was used for numerical modeling analysis,and the results obtained by the two models were compared.The results show that:① The macroscopic deformation and failure process of the model slope is divided into three stages.Muddy interlayer dislocates,and cracks occur;mud interlayer slips,and cracks expand;slope collapses;② The seismic load has a decisive influence on the stability …

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Study On Creep Mechanical Properties And Constitutive Models Of Silty Clay With Different Compaction Degrees, Li Mingchao, Wu Gangrong Dec 2025

Study On Creep Mechanical Properties And Constitutive Models Of Silty Clay With Different Compaction Degrees, Li Mingchao, Wu Gangrong

Journal of China & Foreign Highway

In order to ensure the smooth construction and long-term stable operation of silty clay sections in the Zhoukou –Pingdingshan highway project,this paper conducted one-dimensional creep tests on silty clay samples with different compaction degrees under different stress levels and studied the effect law of compaction degree on its long-term creep mechanical properties.By establishing the corresponding creep constitutive models,a theoretical basis was provided for the prevention and control of creep failure in silty clay subgrades in engineering practice.Research results show that:① Under the same stress level,with the increase of compaction degree,the instantaneous strain,creep strain,and total strain of the samples all decrease …

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Reflection Cracking Resistance And Fatigue Performance Of Super-Flexible Fma Mixture, Lan Yong, Deng Xinghe, Zhang Zida, Wu Kuanghuai, Ding Weizhe, Guan Xuebing, Peng Tiekun Dec 2025

Reflection Cracking Resistance And Fatigue Performance Of Super-Flexible Fma Mixture, Lan Yong, Deng Xinghe, Zhang Zida, Wu Kuanghuai, Ding Weizhe, Guan Xuebing, Peng Tiekun

Journal of China & Foreign Highway

To investigate the fatigue performance and reflection cracking resistance of super-flexible fluid mastic asphalt (FMA ) mixtures,this study designed a super-flexible FMA- 13 mixture by the mastic flow for filling (MaFF ) method.The effects of temperature and maximum horizontal tensile displacement on the cracking resistance of both FMA- 13 and GAC- 13 (as the control ) mixtures were explored via the Overlay Tester.Additionally,small-scale accelerated pavement loading tests were conducted to analyze the effect of load cycles on the rebound modulus of the FMA- 13 mixture.A nonlinear fatigue damage model was employed to predict the fatigue life of both mixtures.The results …

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Research On Pavement Roughness Evaluation Method Based On Smartphones, Siriguleng Bai, Yili Guoqi, A Rong, Guo Guoying, Wang Jing Dec 2025

Research On Pavement Roughness Evaluation Method Based On Smartphones, Siriguleng Bai, Yili Guoqi, A Rong, Guo Guoying, Wang Jing

Journal of China & Foreign Highway

To address the low efficiency and high cost of current detection methods,as well as the insufficient accumulation of pavement damage data on rural low-grade roads,this study developed a vehicle vibration data acquisition application based on smartphones and proposed a conversion method for calculating an index equivalent to the international roughness index (IIRI).Vertical acceleration signals collected during vehicle travel were proposed through high-pass filtering and denoising to calculate the vertical displacement,from which a converted I'IRI was derived.Experimental results show that although the data collected by smartphones has slightly lower accuracy than that collected by professional detection equipment,the proposed I'IRI exhibits a …

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Study On Thermal Corrosion Resistance Of Asphalt Modified By Phase Change Materials, Li Ping, Wang Zhijian, Zheng Zhipeng, Yi Chengxi, Zhou Dexiang Dec 2025

Study On Thermal Corrosion Resistance Of Asphalt Modified By Phase Change Materials, Li Ping, Wang Zhijian, Zheng Zhipeng, Yi Chengxi, Zhou Dexiang

Journal of China & Foreign Highway

In order to address the degradation issues faced by asphalt mixtures in airport runways and highway pavement,particularly focusing on thermal stability and thermal corrosion under high-temperature conditions,this paper investigated the impact of phase change materials (PCMs ) on the thermal corrosion resistance of asphalt.Three types of PCMs were utilized to jointly modify SBS-modified asphalt,and a series of tests were conducted to systematically analyze the performance of the modified asphalt,including thermogravimetric-differential scanning calorimetry (TG-DSC ) analysis,heat storage and release performance evaluation,laboratory thermal corrosion simulation of asphalt,three-index testing,and dynamic shear rheometer (DSR ) testing.The results indicate that PCMs can effectively regulate asphalt …

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Sound Attenuation Characteristics In Relation To Compaction Degree In Sandy Soil, Liu Junbin, Long Shiguo Dec 2025

Sound Attenuation Characteristics In Relation To Compaction Degree In Sandy Soil, Liu Junbin, Long Shiguo

Journal of China & Foreign Highway

In order to investigate the effect of water content and compaction degree on the attenuation characteristics of sound waves in sandy soil,this paper first determined the particle gradation of the soil through a sieving test and identified its optimal water content through a compaction test.Then,six sets of ring knife specimens of sandy soil with different water contents and nine sets with varying compaction degrees were prepared.Ultrasonic testing was carried out using the acoustic transmission method,and the received acoustic signals were subjected to time-frequency analysis to extract acoustic characteristic parameters indicative of the compaction degree.Finite element simulation was employed to explore …

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Road Performance And Water-Softening Characteristics Of Stabilized Soil Under Cyclic Loading, Hu Hong, Li Zongheng, Feng Yong, Cao Zhigang, Liu Yaoxing Dec 2025

Road Performance And Water-Softening Characteristics Of Stabilized Soil Under Cyclic Loading, Hu Hong, Li Zongheng, Feng Yong, Cao Zhigang, Liu Yaoxing

Journal of China & Foreign Highway

To effectively deal with waste soil and reduce environmental pollution,this paper took a road engineering project in Shaoxing as the research object and conducted a cyclic triaxial incremental loading test on the undisturbed lime soil under undrained conditions to study the effects of confining pressure,cyclic stress ratio,and water immersion on its performance.The results show that when the cyclic stress ratio increases from 1 to 4,the cumulative strain and resilient strain increase rapidly in the initial loading stage,showing a trend of “stepwise” increase.The cumulative strain produced at a cyclic stress ratio of 2 is about twice that at the cyclic stress …

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Study On Mechanical Properties Of Improved High Liquid Limit Soil Based On Solid Waste, Zhang Yafei, Qin Yalan, Wu Jiacheng, Zhang Rui, Gao Yingli, Zhu Zhanghuang, Li Lu Dec 2025

Study On Mechanical Properties Of Improved High Liquid Limit Soil Based On Solid Waste, Zhang Yafei, Qin Yalan, Wu Jiacheng, Zhang Rui, Gao Yingli, Zhu Zhanghuang, Li Lu

Journal of China & Foreign Highway

To improve the application of the solid waste polymer-modified high liquid limit soil as filler in the upper embankment or road bed work area,this study prepared colloidal polymer and improved materials of traditional cement by using industrial solid waste (fly ash,steel slag,etc.) and compared them with the improved high liquid limit soil to investigate its mechanical properties and economic benefits.The mechanical properties of high liquid limit soil improved by the colloidal polymer of solid waste,as well as its stability and durability when immersed in water were studied through a liquid-plastic limit test,a laboratory compaction test,a shrinkage test,a California bearing ratio …

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