Classification And Damage Characteristics Of Complex Secondary Cracks In Granite Residual Soil,
2023
Department of Civil and Environmental Engineering, Shantou University, Shantou, Guangdong 515000, China; State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei
430071, China
Classification And Damage Characteristics Of Complex Secondary Cracks In Granite Residual Soil, Cheng-Sheng Li, Bing-Xin Zhang, Zhi-Jun Liu
Rock and Soil Mechanics
The development of cracks is important to the damage and failure of soil. In order to study the evolution of meso-cracks in granite residual soil with complex geotechnical engineering properties, a series of reconstructed volume images was obtained by using CT to scan the process of the triaxial compression test. The crack volume overlap rate is introduced to improve the crack classification method proposed by the author, and the accuracy of judging the connectivity of the two cracks before and after deformation is improved. The results reveal that the change of crack volume overlap rate has a slight effect on …
Pull-Out Test Study On Mechanical Characteristics Of Geogrid-Aggregate Interface,
2023
School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; China Railway Design Corporation, Tianjin 300308, China; School of Civil Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, China
Pull-Out Test Study On Mechanical Characteristics Of Geogrid-Aggregate Interface, Mu-Han Yan, Xian-Zhang Ling, Liang Tang, Hong Xiao, Xu-Guo Song
Rock and Soil Mechanics
Geogrids are often used in the aggregate cushion of the composite foundation to limit the lateral displacement and reduce the differential deformation. It depends on the interaction between geogrids and aggregate particles. In this study, a series of large-size pull-out tests was performed on biaxial and triaxial geogrids embedded in aggregates with three particle-size gradations. The test results showed that higher normal stress, better gradation and more suitable aggregate particle sizes yielded the increase of the pull-out resistance. The classic punching-shear failure model was proven to be valid for explaining the shear effect between transverse ribs of biaxial geogrids and …
Prediction Of Consolidation Coefficient Of Soft Soil Using An Artificial Neural Network Models With Biogeography-Based Optimization,
2023
Institute of Geotechnical Engineering, Southeast University, Nanjing, Jiangsu 211189, China
Prediction Of Consolidation Coefficient Of Soft Soil Using An Artificial Neural Network Models With Biogeography-Based Optimization, Cai-Jin Wang, Meng Wu, Yang Yang, Guo-Jun Cai, Song-Yu Liu, Huan He, Jian-Xin Chang
Rock and Soil Mechanics
The consolidation coefficient Cv of soft soil is an important parameter in geotechnical engineering. The artificial neural network (ANN) model is improved with the biogeography-based optimization algorithm (BBO). And the artificial neural network with biogeography-based optimization (ANN-BBO) model, trained and tested by using the subgrade soft soil data of the reconstruction and expansion project of Lianyungang–Huai’an expressway, has been adopted to calculate the soft soil consolidation coefficient. Using the correlation coefficient matrix and principal component analysis, eleven physical and mechanical parameters were statistically analyzed, seven of which were identified as input parameters of calculation model which was then trained and …
Effect Of Particle Swelling On Hydraulic Performance And Meso-Mechanism Of Geosynthetic Clay Liners,
2023
College of Mechanics and Engineering Science, Shanghai University, Shanghai 201900, China; School of Civil Engineering, Qinghai University, Xining, Qinghai 810016, China; School of Engineering, University of Virginia, Charlottesville, VA 22904, USA
Effect Of Particle Swelling On Hydraulic Performance And Meso-Mechanism Of Geosynthetic Clay Liners, Juan Hou, Jin-Bang Zhang, Yin-Yu Sun, Rui Sun, Fei-Yu Liu
Rock and Soil Mechanics
The hydraulic performance of geosynthetic clay liners (GCL) is closely related to the swelling characteristics of the bentonite particles and the resulting porous medium. However, there currently needs to be more analysis at the mesoscopic level to understand the permeating mechanisms. A numerical model using COMSOL was developed to study the effects of particle swelling on the effective porosity, tortuosity, and hydraulic conductivity of GCL under deionized water actions. The results demonstrate that the swelling of bentonite particles is a crucial factor influencing the effective porosity, tortuosity, and hydraulic conductivity of GCL. Particle swelling significantly affects the width and number …
Study On The Environmental Durability Of Heavy Metal Contaminated Soil Remediated By Enzyme Induced Carbonate Precipitation,
2023
School of Civil Engineering and Architecture, Henan University, Kaifeng, Henan 475004, China; Kaifeng Technology Research Center of Engineering on Soil Modification and Restoration, Henan University, Kaifeng, Henan 475004, China
Study On The Environmental Durability Of Heavy Metal Contaminated Soil Remediated By Enzyme Induced Carbonate Precipitation, Han-Liang Bian, Pei-Rui Ji, Jun-Ling Wang, Xu-Gang Zhang, Xiang-Chun Xu
Rock and Soil Mechanics
To explore the environmental durability of heavy metal contaminated soil remediated by enzyme induced carbonate precipitation (EICP) technology, acid soaking, freeze-thaw tests, and rainfall tests were carried out on the zinc and lead contaminated soil after EICP remediation, respectively. The durability and influence of the zinc and lead contaminated soil remediated by EICP technique under different environmental conditions and the corresponding influence regularity were discussed in this paper. The results showed that under different concentrations and types of acid solutions, the leaching amount of heavy metal ions in exchangeable and carbonate bound forms in the zinc and lead contaminated soil …
Experimental Study On Rock Joint Permeability Evolution During Plugging Process By Microbially Induced Calcite Precipitation,
2023
School of Civil Engineering, Sichuan Agricultural University, Dujiangyan, Sichuan 611830, China; Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction, Sichuan Agricultural University, Dujiangyan,
Sichuan 611830, China
Experimental Study On Rock Joint Permeability Evolution During Plugging Process By Microbially Induced Calcite Precipitation, Wei-Min Xiao, Xin Lin, Jian-Min Zhong, Shuang Li, Zhan-Yuan Zhu
Rock and Soil Mechanics
Microbially induced calcite precipitation (MICP) has been widely applied for soil reinforcement, but its applications in rock mass permeability reduction have been rarely reported. To explore the plugging mechanism of rock joints using MICP, artificial rock joint specimens made of transparent resin were prepared, and laboratory MICP plugging experiments under six various conditions considering MICP reaction influence factors were performed. Through the plugging experiments, evolution laws of rock joint transmissivity and hydraulic aperture, accompanied with corresponding CaCO3 distribution images, during plugging processes were obtained. The experimental results showed that the hydraulic aperture of rock joint approximately decreases linearly with grouting …
Inverse Analysis On Dynamic Shear Modulus Of Earth-Rockfill Dam Foundation Based On The Influence Of Dynamic Earth Pressure,
2023
Center for Hypergravity Experimental and Interdisciplinary Research, Zhejiang University, Hangzhou, Zhejiang 310058, China
Inverse Analysis On Dynamic Shear Modulus Of Earth-Rockfill Dam Foundation Based On The Influence Of Dynamic Earth Pressure, Xiao-Shi Huang, Jun-Qing Huang, Ye-Gan Yan, Yu-Bing Wang
Rock and Soil Mechanics
The one-dimensional shear beam model method is unsuitable for determining the stress–strain relationship in the earth-rockfill dam foundation because of the constrained ground surface and the effects of the lateral normal stress. A centrifugal shaking table test was conducted on an earth-rockfill dam with overburden saturated sand foundation to analyze the soil acceleration response in the non- dam-covered area of the foundation, middle and toe of the dam under different input seismic loads. This test also obtained the variation characteristics of the horizontal dynamic earth pressure in the upper and middle layers of the dam foundation. An inverse calculation method …
Service-Learning In Action: Lafayette, Indiana, Rain Garden Installation,
2023
Purdue University
Service-Learning In Action: Lafayette, Indiana, Rain Garden Installation, Elizabeth Mccleery
Purdue Journal of Service-Learning and International Engagement
Indiana’s Wabash River is being polluted with contaminated water runoff from precipitation events. A lack of pervious land cover has led to an accumulation of fertilizer, sediment, and waste in the river. Green infrastructure, a stormwater management practice that mimics the natural ecosystem, is one of the most effective ways to prevent pollution from stormwater runoff and benefit the community. This project consisted of a rain garden installation at the Lafayette Fueling Station, a site where frequent water drainage and water runoff into the Wabash occurs. The rain garden will allow on-site water infiltration during rain events and promote natural …
Experimental Study On Shear Properties Of Fault Gouge With Different Mineral Compositions,
2023
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Science, Wuhan, Hubei 430071, China; University of Chinese Academy of Sciences, Beijing 100049, China
Experimental Study On Shear Properties Of Fault Gouge With Different Mineral Compositions, Li-Huan Xie, He-Juan Liu, Sheng-Nan Ban, Hai-Jun Mao, De-Bin Xia, Yu-Jia Song, Rong-Chen Tong, Qi-Qi Ying
Rock and Soil Mechanics
The strength parameters of fault gouge is significant for the fault sealing of underground gas storage. In this paper, direct shear tests are performed for fault gouge composed of different contents of kaolinite(K), montmorillonite(M) and quartz(Q), thus obtaining the shear strength parameters (cohesion c and internal friction angle ) of various types of fault gouge. The results reveal that: (1) the cohesion of fault gouge is positively correlated with the content of montmorillonite and negatively correlated with the content of quartz. The cohesion of fault gouge specimens with high content of montmorillonite (≥40%) is positively correlated with the content of …
Experimental Study Of Capillary Water Rising In Aeolian Sand Using A Moisture Field Testing Technique Based On Image Rgb Information,
2023
Guangxi Key Laboratory of Rock and Soil Mechanics and Engineering, Guilin University of Technology, Guilin, Guangxi 541004, China; State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
Experimental Study Of Capillary Water Rising In Aeolian Sand Using A Moisture Field Testing Technique Based On Image Rgb Information, Sheng-Kui Tian, Guan-Shi Liu, Qing-Song Zhao, Guo-Fang Xu, Ming-Xuan Cai
Rock and Soil Mechanics
Capillary action has an important impact on the deformation and stability of various geotechnical engineering structures. It is challenging to accurately monitor the dynamic changes in the capillary water rising process by traditional methods. In this study, the relationship between RGB (red, green, blue) information and water content of aeolian sand images was firstly investigated. The methodology and technology for measuring water content and obtaining centimeter-level resolution moisture fields via image RGB information were developed. According to this method, the spatial-temporal variation of water content during capillary water rising in aeolian sand was further explored, and the wetting front profile …
Experimental Investigation On Quantitative Evaluation Of Rock Hardness Based On Impact Energy Dissipation Index,
2023
China State key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
Experimental Investigation On Quantitative Evaluation Of Rock Hardness Based On Impact Energy Dissipation Index, Rui-Lang Cao, Yu-Jie Wang, Bo Xing, Yu-Fei Zhao, Qiang Shen
Rock and Soil Mechanics
Rock hardness is an important indicator reflecting the relative hardness, drillability, and blastability of rock formation. Accurate interpretation of the response of percussion drilling tools can provide new possibilities for in-situ, rapid, and quantitative evaluation of rock hardness. High-precision digital displacement, hydraulic pressure, and rotational speed sensors were used to monitor the key transmission parts of the percussion drill, and a digital monitoring system for the drilling process was then established. Rock hardness measurement and orthogonal tests of percussion drilling were parallelly carried out, and a standard database containing response data of the drill when drilling various types of rocks …
Multi-Directional Cyclic Simple Shear Behaviour Of Loose Sand Under Complex Initial Stress States,
2023
School of Highway, Chang’an University, Xi’an, Shaanxi 710064, China
Multi-Directional Cyclic Simple Shear Behaviour Of Loose Sand Under Complex Initial Stress States, Yao Li, Jia-Ping Li
Rock and Soil Mechanics
Loose sand is highly susceptible to liquefaction, and small changes in stress state can affect its liquefaction characteristics. Based on multi-directional cyclic simple shear tests, this study conducted cyclic simple shear tests on loose sand under different magnitudes and directions of static shear stress, and complex shear paths. The cyclic simple shear characteristics of loose sand under complex initial stress states are studied. The main conclusions are drawn as follows: (1) As the static shear stress ratio increases, the peak shear stress of the specimen increases, the increment of pore water pressure in the first cycle increases, and the specimen …
Characteristics And Mechanism Of Soil Heave At The Bottom Of Ultra-Deep Circular Shafts In Soft Soil Areas,
2023
Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China; Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China
Characteristics And Mechanism Of Soil Heave At The Bottom Of Ultra-Deep Circular Shafts In Soft Soil Areas, Ya-Fei Qiao, Kai Yan, Teng-Teng Zhao, Wen-Qi Ding
Rock and Soil Mechanics
Based on an ultra-deep circular shaft project in Shanghai, the field data of soil heave at the bottom of the pit during the construction were collected, and the vertical distribution pattern, evolution law and main influencing factors of soil heave at the bottom of the pit were summarized. An axisymmetric numerical model was then built and verified to investigate the effect of the excavation-induced unloading, dewatering, diaphragm wall and soil mechanical properties on the soil heave, then the mechanism of soil heave was revealed. Soil heave was the combined result of the soil mechanical response under the excavation-induced unloading, dewatering, …
Numerical Simulation Of Three-Dimensional Rock Fragmentation By Disc Cutters Of Tunnel Boring Machine Using Peridynamics,
2023
Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China; Engineering Research Center of Urban Underground Development of Zhejiang Province, Zhejiang University, Hangzhou, Zhejiang 310058, China
Numerical Simulation Of Three-Dimensional Rock Fragmentation By Disc Cutters Of Tunnel Boring Machine Using Peridynamics, Jian Zhou, Xiao-Nan Shang, Fu-Shen Liu, Jun-Yi Shen, Xing-Chuan Liao
Rock and Soil Mechanics
Peridynamics is a non-local mesh-free numerical method which has great advantages in simulating dynamic damage and fracture. This work proposes to use the peridynamics to simulate rock fragmentation by TBM disc cutters and seven tests are simulated to verify this idea. The feasibility of peridynamics in simulating rock fragmentation by TBM disc cutters is demonstrated by comparisons with the punch indentation tests. A nonlinear short-range force contact model is proposed to better reflect the variation of the disc cutter normal force with respect to indentation depth, and can also calculate the changing contact area between the disc cutter and the …
Shaking Table Test Study On The Influence Of Seismic History On Liquefaction Resistance Of Soils At Different Depths,
2023
College of Civil Engineering, Hebei University of Engineering, Handan, Hebei 056038, China 2. Institute of Geotechnical Engineering, Tianjin University, Tianjin 300072, China
Shaking Table Test Study On The Influence Of Seismic History On Liquefaction Resistance Of Soils At Different Depths, Xiao-Lei Wang, Li-Teng Liu, Run Liu, Li-Bo Liu, Lin Dong, Hai Ren
Rock and Soil Mechanics
Earthquake-induced liquefaction can cause significant damage to geotechnical structures, and the aftershocks accompanying the earthquakes may cause the sandy soils to liquefy again. To investigate the effect of free-field subsurface seismic history on the liquefaction resistance of saturated sandy soils at various depths, a series of shaking table tests was designed and conducted. Four shaking events with different accelerations, subdivided into seven smaller events, were input to the sandy soil in the tests. The excess pore pressure ratio, acceleration response, and soil settlement were calculated and compared for each vibration event to investigate the variation laws of soil liquefaction resistance …
Early-Age Strength And Failure Characteristics Of 3d Printable Polymer Concrete: Numerical Modelling And Experimental Testing,
2023
University of New Mexico - Main Campus
Early-Age Strength And Failure Characteristics Of 3d Printable Polymer Concrete: Numerical Modelling And Experimental Testing, Mohammad Amin Dehghani Najvani
Civil Engineering ETDs
The time-dependent rheological and early-age strength parameters of Polymer concrete (PC) were investigated. PC flow decreased, and the static yield stress and thixotropy increased as the specimen aged, while the dynamic yield stress remained unchanged. The study found that the Herschel-Bulkley model can accurately describe the PC’s rheological behavior over time. The change in cohesion strength and internal friction angle over time was observed using uniaxial unconfined compression and direct shear tests of fresh PC. A time-dependent MohrCoulomb failure criterion was established. Temperature analysis was used to determine the gel time and explain the evolution of the time-dependent early-age strength …
Modeling Of Asphalt Concrete For Cross-Anisotropic Visco-Elasticity And Heterogeneity,
2023
University of New Mexico - Main Campus
Modeling Of Asphalt Concrete For Cross-Anisotropic Visco-Elasticity And Heterogeneity, Zafrul Hakim Khan
Civil Engineering ETDs
Asphalt Concrete (AC) is a cross-anisotropic viscoelastic material. This study has developed a methodology to backcalculate the cross-anisotropic properties of the AC layer from the Falling Weight Deflectometer (FWD) sensor and pavement response data from embedded sensors inside a pavement section. This study has also developed a two-way coupled Multiscale Finite Element Model (MsFEM) with Phase Field Fracture (PFF) to study the microstructural heterogeneity and damage of the AC layer based on the actual field loadings. A Finite Difference Time Domain (FDTD) and Machine learning-based backcalculation algorithm were developed to determine the layer thickness and dielectric constant from air-coupled Ground …
Dynamic Response And Effect Of Loading Rate Of Soil Under Impact Loading,
2023
School of Civil Engineering, Guangzhou Institute of Science and Technology, Guangzhou, Guangdong 510040, China; School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, Guangdong 510006, China
Dynamic Response And Effect Of Loading Rate Of Soil Under Impact Loading, Yong-Jian Liu, Yang-Pan Fu, Ming-Yang Lai, Zhang-Ming Li, Hao-Yuan Fang, Zhi-Kun Xie
Rock and Soil Mechanics
To study the dynamic response characteristics of soil under impact load, plate dynamic load tests (PDLT) with different load levels and loading rates were carried out on two typical soils (sand and clay) in Guangzhou University Town by using the self-developed additional excitation force-type PDLT system, obtaining three characteristic curves of load-time curve, displacement-time curve, and load-displacement curve, establishing the empirical formula of dynamic deformation modulus and loading rate, and comparing the effects of loading rate of the two soils under impact load. It shows that: (1) There is a threshold of charging voltage in the PDLT test of sand. …
Enhancing Wettability Prediction In The Presence Of Organics For Hydrogen Geo-Storage Through Data-Driven Machine Learning Modeling Of Rock/H2/Brine Systems,
2023
Edith Cowan University
Enhancing Wettability Prediction In The Presence Of Organics For Hydrogen Geo-Storage Through Data-Driven Machine Learning Modeling Of Rock/H2/Brine Systems, Zeeshan Tariq, Muhammad Ali, Nurudeen Yekeen, Auby Baban, Bicheng Yan, Shuyu Sun, Hussein Hoteit
Research outputs 2022 to 2026
The success of geological H2 storage relies significantly on rock–H2–brine interactions and wettability. Experimentally assessing the H2 wettability of storage/caprocks as a function of thermos-physical conditions is arduous because of high H2 reactivity and embrittlement damages. Data-driven machine learning (ML) modeling predictions of rock–H2–brine wettability are less strenuous and more precise. They can be conducted at geo-storage conditions that are impossible or hazardous to attain in the laboratory. Thus, ML models were utilized in this research to accurately model the wettability behavior of a ternary system consisting of H2, rock minerals (quartz and mica), and brine at different operating geological …
Study Of Multi-Dimensional Transfer Effects In Applied Smouldering Systems,
2023
Western University
Study Of Multi-Dimensional Transfer Effects In Applied Smouldering Systems, Seyed Ziaedin Miry Mr
Electronic Thesis and Dissertation Repository
Smouldering is a flameless form of combustion that is driven by oxygen directly diffusing into the surface of condensed phase fuel (liquid or solid) and involves a complex interplay between heat and mass transfer through porous media, chemical reactions, and multiphase flow. Applied smouldering systems have been gaining popularity for a variety of applications including (i) energy and resource recovery, (ii) waste-to-energy, (iii) pyrolysis and gasification, and (iv) applied smouldering of organic liquids/solids for environmental benefits. In all contexts, smouldering is a complicated oxygen-limited phenomenon where multi-dimensional transfer effects (i.e., non-uniformities in …
