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2025

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Articles 1081 - 1110 of 1515

Full-Text Articles in Civil and Environmental Engineering

Assessing Experiences Of Women In Mep Field And Project Management Roles, Lily K. Brown Mar 2025

Assessing Experiences Of Women In Mep Field And Project Management Roles, Lily K. Brown

Construction Management

Despite increased enrollment of women in construction education programs, the industry is not seeing significant gains in the percentages of women, especially in field and project management roles. This study looks specifically at the experiences of women in the Mechanical, Electrical, and Plumbing (MEP) sector working in field and project management. Women in different career stages were interviewed to gain perspective on the state and climate of the industry from a woman’s perspective. The interviews were analyzed for recurring themes and three primary themes that emerged were: 1) women see themselves as able to bring about better team synthesis than …

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Introduction Of An Industial Construction Topics Course In The Cal Poly Cm Curriculum, Connor N. Merz Mar 2025

Introduction Of An Industial Construction Topics Course In The Cal Poly Cm Curriculum, Connor N. Merz

Construction Management

The industrial construction sector represents a significant portion of the construction industry, yet it remains underrepresented in many academic programs, including the Construction Management (CM) curriculum at California Polytechnic State University (Cal Poly). This research investigates the feasibility and interest in introducing a dedicated industrial construction elective course to bridge this gap. A student survey was conducted to assess interest levels and determine relevant topics for the course, while an industry interview provided professional insight into necessary competencies. Survey results indicated strong student interest, with 71% expressing a willingness to take the course. The study identified key topics such as …

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Comparing The Work-Life Balance And Stress At General Contractors And Cm Agencies, Lucca A. Arcolino Mar 2025

Comparing The Work-Life Balance And Stress At General Contractors And Cm Agencies, Lucca A. Arcolino

Construction Management

The struggle for a work-life balance has become a significant issue in the construction industry, resulting in personal and organizational challenges. This paper will compare work-life balance and stress between industry professionals working at a CM agency and those at a general contractor. A CM agency is responsible for overseeing the construction project alongside the owner by providing planning, cost estimation, scheduling, and quality assurance. In contrast, the general contractor is responsible for managing the day-to-day operations on-site. A survey was distributed to both types of construction firms to collect data about work hours, work-life balance, stress, and biggest stressors. …

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The Application Of Decision Analysis Theory For Space Allocation At The Air Force Institute Of Technology, Damian N. Soriano Mar 2025

The Application Of Decision Analysis Theory For Space Allocation At The Air Force Institute Of Technology, Damian N. Soriano

Theses and Dissertations

This thesis investigates the application of Decision Analysis Theory to optimize space allocation at the Air Force Institute of Technology (AFIT). Through a Multi-Objective Decision Analysis (MODA) framework, this study addresses existing methodologies for space allocation in military, academic, and office settings; the rules, limitations, and factors influencing space utilization at AFIT; and approaches to improve office and lab allocations for institutional efficiency and fairness. This research incorporates qualitative and quantitative metrics, including faculty and student data, research outputs, and historical space usage. These findings highlight significant complexities in space allocation, particularly in reconciling administrative and research requirements with structural …

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Advancing Sustainable Road Construction With Cold Mix Rap And Rejuvenator, Abeeb G. Oyelere Mar 2025

Advancing Sustainable Road Construction With Cold Mix Rap And Rejuvenator, Abeeb G. Oyelere

Shelby Hall Graduate Research Forum Presentations

Presentation slides for a presentation given at the 1st annual Shelby Hall Graduate Research Forum at the University of South Alabama.

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Modelled Flooding Impacts On Lower Fish River Watershed, Sebastian Loschner Mar 2025

Modelled Flooding Impacts On Lower Fish River Watershed, Sebastian Loschner

Shelby Hall Graduate Research Forum Posters

This study investigates the impacts of compound flooding in the Lower Fish River watershed, Baldwin County, Alabama, with a focus on the potential effects of sea level rise due to climate change. Coastal flooding, particularly in smaller watersheds, is a growing concern as it results from the interaction of multiple factors, including rainfall, tidal changes, and extreme weather events. Compound flooding, which involves multiple flood drivers, is expected to worsen with climate change, as increased precipitation and rising sea levels create heightened flood risks. However, existing research on compound flooding predominantly focuses on large-scale watersheds, leaving a knowledge gap in …

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Toward Sustainability: A New Construction Method For Electrically Heated Rigid Pavement Systems, Mohamed Abdel-Raheem, Mohammad Anis Mar 2025

Toward Sustainability: A New Construction Method For Electrically Heated Rigid Pavement Systems, Mohamed Abdel-Raheem, Mohammad Anis

Civil Engineering Faculty Publications

Damage caused by snow and ice to airport pavements in colder regions of the United States presents a persistent and economically significant challenge. This research explores an innovative construction method using an electrically conductive composite (ECC) composed of waterborne polyurethane and graphite powder (Gp). The ECC is applied to a Portland cement concrete substrate through a parallel stripe technique, using two types of “exposed” specimen. The study thoroughly examines the resistive heating performance of these specimens under various conditions, focusing on critical factors such as Gp concentrations in ECC, stripe thickness, spacing, and applied voltages. ECC was prepared with varying …

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Generating Synthetic Images For Construction Machinery Data Augmentation Utilizing Context-Aware Object Placement, Yujie Lu, Bo Liu, Wei Wei, Bo Xiao, Zhangding Liu, Wensheng Li Mar 2025

Generating Synthetic Images For Construction Machinery Data Augmentation Utilizing Context-Aware Object Placement, Yujie Lu, Bo Liu, Wei Wei, Bo Xiao, Zhangding Liu, Wensheng Li

Michigan Tech Publications

Dataset is an essential factor influencing the accuracy of computer vision (CV) tasks in construction. Although image synthesis methods can automatically generate substantial annotated construction data compared to manual annotation, existing challenges limited the CV task accuracy, such as geometric inconsistency. To efficiently generate high-quality data, a synthesis method of construction data was proposed utilizing Unreal Engine (UE) and PlaceNet. First, the inpainting algorithm was applied to generate pure backgrounds, followed by multi-angle foreground capture within the UE. Then, the Swin Transformer and improved loss functions were integrated into PlaceNet to enhance the feature extraction of construction backgrounds, facilitating object …

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Shear Behavior Of Ultra-High-Performance Concrete Deep Beams Reinforced With Fibers: A State-Of-The-Art Review, Hossein Mirzaaghabeik, Nuha S. Mashaan, Sanjay Kumar Shukla Mar 2025

Shear Behavior Of Ultra-High-Performance Concrete Deep Beams Reinforced With Fibers: A State-Of-The-Art Review, Hossein Mirzaaghabeik, Nuha S. Mashaan, Sanjay Kumar Shukla

Research outputs 2022 to 2026

Ultra-high-performance concrete (UHPC) is considered a highly applicable composite material due to its exceptional mechanical properties, such as high compressive strength and ductility. UHPC deep beams are structural elements suitable for short spans, transfer girders, pile caps, offshore platforms, and bridge applications where they are designed to carry heavy loads. Several key factors significantly influence the shear behavior of UHPC deep beams, including the compressive strength of UHPC, the vertical web reinforcement (ρsv), horizontal web reinforcement (ρsh), and longitudinal reinforcement (ρs), as well as the shear span-to-depth ratio (λ), fiber type, fiber content (FC), and geometrical dimensions. In this paper, …

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Smart Highway Construction Site Monitoring Using Artificial Intelligence, Mehran Mazari, Yahaira Nava-Gonzalez, Ly Jacky N. Nhiayi, Mohamad H. Saleh Mar 2025

Smart Highway Construction Site Monitoring Using Artificial Intelligence, Mehran Mazari, Yahaira Nava-Gonzalez, Ly Jacky N. Nhiayi, Mohamad H. Saleh

Mineta Transportation Institute

Construction is a large sector of the economy and plays a significant role in creating economic growth and national development,and construction of transportation infrastructure is critical. This project developed a method to detect, classify, monitor, and track objects during the construction, maintenance, and rehabilitation of transportation infrastructure by using artificial intelligence and a deep learning approach. This study evaluated the performance of AI and deep learning algorithms to compare their performance in detecting and classifying the equipment in various construction scenes. Our goal was to find the optimized balance between the model capabilities in object detection and memory processing requirements. …

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Assessing The Perceived Safety Of Cyclists With Virtual Reality, Vahid Balali Mar 2025

Assessing The Perceived Safety Of Cyclists With Virtual Reality, Vahid Balali

Mineta Transportation Institute

In 2022, 7,522 pedestrians and 1,084 bicyclists were killed and approximately 67,000 pedestrians and 46,195 bicyclists injured in motor vehicle crashes on public roadways in the United States, according to the Insurance Institute for Highway Safety (IIHS). The transportation industry is faced with a pressing need to bolster the safety of these vulnerable road users. This research develops models of design and environmental factors that influence bicyclists’ and pedestrians’ perception of safety using Virtual Reality (VR) technology and ultimately informs transportation infrastructure design to better accommodate nonmotorized travelers. The goal of the bicycle element of this research is to develop …

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Numerical Analyses Of Construction Materials At Different Scales For Improved Resilience And Sustainability Of Civil Infrastructures, Chenchen Huang Feb 2025

Numerical Analyses Of Construction Materials At Different Scales For Improved Resilience And Sustainability Of Civil Infrastructures, Chenchen Huang

Theses and Dissertations

The resilience and sustainability of civil infrastructure are fundamental to supporting modern society in the face of growing environmental challenges and resource limitations. This study aims to use multi-scale numerical tools to evaluate mechanical performance of different construction materials under various environmental and loading conditions. Firstly, we adopt the discrete element method (DEM) to evaluate the influence of freeze-thaw cycles (FTCs) action on the mechanical properties of rock from the micro perspective. A simplified plastic model is proposed to capture the residual deformation produced during FTCs. To further explore the deterioration of FTCs on rock, the water-contained grain-based model (GBM) …

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Immersive Modeling To Communicate And Manage Risks Of Water Shortages, David Rosenberg, Erki Porse Feb 2025

Immersive Modeling To Communicate And Manage Risks Of Water Shortages, David Rosenberg, Erki Porse

Civil and Environmental Engineering Faculty Publications

Our project goal is to use immersive online collaborative modeling as a tool for active learning to communicate and manage users conflicting risks of water shortages because decisions now to manage risk effect future risk. State-of-the art river basin forecasting tools provide probabilistic estimates of streamflow at hourly to annual scales. Water resource models quantify tradeoffs and risk across hundreds or thousands of scenarios of inflow and demand forecast out decades. Our project objectives are: 1) Formulate extreme scenarios for reservoir inflows without probabilities one to three years out that pose imminent risk of water shortages. 2) Hold immersive model …

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Static Performance And Stability Of A Multi-Span Hybrid Continuous Rigid Frame Bridge With High Piers, Huang Yu, Liu Guanyu, Yi Jianbo, Xing Xuan, Su Miao, Peng Hui Feb 2025

Static Performance And Stability Of A Multi-Span Hybrid Continuous Rigid Frame Bridge With High Piers, Huang Yu, Liu Guanyu, Yi Jianbo, Xing Xuan, Su Miao, Peng Hui

Journal of China & Foreign Highway

In order to study the static performance and stability of a steel-concrete composite continuous rigid frame bridge in Suichang,Zhejiang Province,a single girder and girder lattice finite element model for the whole bridge was established by using Midas Civil,and a local solid finite element model was established by using Ansys.A detailed analysis of the structural displacement and stress state of the bridge in use and the local stress in the solid section of the pier and girder under different loads was carried out.The influence of the pile-bottom restraint stiffness and pier-girder connection form on the overall stability of the bridge was …

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Influence Of Train Speed On Thermal Insulation And Anti-Thawing Length For Tunnel In Cold Region, Huang Huanan, Chen Yong, Wang Yibo, Wu Yaping Feb 2025

Influence Of Train Speed On Thermal Insulation And Anti-Thawing Length For Tunnel In Cold Region, Huang Huanan, Chen Yong, Wang Yibo, Wu Yaping

Journal of China & Foreign Highway

To study the influence of train speed on thermal insulation and anti-thawing measures for surrounding rock of tunnels in cold regions,it is necessary to analyze the temperature field.By using the Kunlun Mountain Tunnel Project in cold regions as a case study,the effects of external atmospheric temperature,piston wind effects caused by varying train speeds,and the driving resistance on the distribution of the tunnel ’s internal temperature field were considered.A three-dimensional numerical calculation model including the surrounding rock,concrete lining,and tunnel air was established by utilizing the thermo-fluid-structure interaction (TFSI ) technique.The thermal environment variations caused by trains at different speeds were predicted.The …

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Parametric Analysis Of Composite Slab With Steel Bar Trusses At Construction Stages, Zhang Junhao, He Jun, Tan Chao, Feng Sidong, Wang Zitong Feb 2025

Parametric Analysis Of Composite Slab With Steel Bar Trusses At Construction Stages, Zhang Junhao, He Jun, Tan Chao, Feng Sidong, Wang Zitong

Journal of China & Foreign Highway

To clarify the structural behavior of composite slab with steel bar trusses at key construction stages including hoisting and concrete post-pouring,a composite beam bridge with a main span of 60 m in Georgia ’s E60 Highway was investigated.A finite element model was developed by using ABAQUS to simulate the construction process and analyze the influence of parameters such as prefabricated bottom slab material,number of hoisting points,slab thickness,and number of steel bar trusses on the principal stress of concrete and mid-span deflection.The results indicate that ultra-high-performance concrete (UHPC ) prefabricated bottom slabs prevent plastic damage and enhance slab stiffness.Normal concrete (NC) …

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Cracking Characteristics Of Cement-Stabilized Macadam With Early Strength Agent Under Variable Temperature And Humidity Curing Conditions, Ge Dongdong, Liu Dingyuan, Lyu Songtao, Jiang Xiangyang, Xue Yanhua, Yu Yang Feb 2025

Cracking Characteristics Of Cement-Stabilized Macadam With Early Strength Agent Under Variable Temperature And Humidity Curing Conditions, Ge Dongdong, Liu Dingyuan, Lyu Songtao, Jiang Xiangyang, Xue Yanhua, Yu Yang

Journal of China & Foreign Highway

In environments with large temperature variations and low humidity,the curing conditions of cement-stabilized macadam fail to meet the specifications,leading to slow early strength development and increased susceptibility to cracking.This study aimed to investigate the effects of actual environmental temperature,humidity,curing age,and addition of early strength agents on the cracking characteristics of cement-stabilized macadam.Variable temperature conditions were determined based on actual environmental temperature data.Four curing conditions were set by combining temperatures (variable temperature and standard temperature ) with relative humidity of 95%,80%,and 65%,respectively.Three types of specimens were prepared with 0%,10%,and 15% early strength agent contents and cured for 14 and 28 days,respectively.The …

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Identification And Prediction Model For Traffic Blockage State Of Highways To Xizang, Wu Ling, Liu Jianbei, Zhang Zhiwei, Shan Donghui, Chi Gandu Feb 2025

Identification And Prediction Model For Traffic Blockage State Of Highways To Xizang, Wu Ling, Liu Jianbei, Zhang Zhiwei, Shan Donghui, Chi Gandu

Journal of China & Foreign Highway

To identify the traffic blockage state on highways to Xizang in extreme environments,comprehensive evaluation indicators for traffic blockage state based on the entropy-weighted TOPSIS method were proposed by using the traffic blockage event parameters observed on four major highways to Xizang:Sichuan ‒ Xizang Highway,Yunnan ‒ Xizang Highway,Qinghai ‒ Xizang Highway,and Xinjiang ‒ Xizang Highway.The K-Medoids clustering algorithm was used to categorize the traffic blockage state into different levels.By considering factors such as hazard types,road types,traffic volume,and vehicle type ratios,a classification model for the traffic blockage state on highways to Xizang was constructed based on machine learning algorithms.The results show that …

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Seismic Performance Of Bridge Pile Foundation Considering Effects Of Material Freeze-Thaw Deterioration And Permafrost Degradation, Zhang Xiyin, Yu Shengsheng, Wang Wanping, Wen Hairong Feb 2025

Seismic Performance Of Bridge Pile Foundation Considering Effects Of Material Freeze-Thaw Deterioration And Permafrost Degradation, Zhang Xiyin, Yu Shengsheng, Wang Wanping, Wen Hairong

Journal of China & Foreign Highway

In cold and high-seismic regions,such as the Qinghai‒Xizang Plateau in China,the deterioration of material properties caused by freeze-thaw cycles and permafrost degradation due to climate change have become increasingly severe,posing significant challenges for the seismic performance assessment of bridge pile foundations.To systematically investigate the impact of permafrost degradation and material freeze-thaw deterioration on the seismic performance of bridge pile foundations and ensure proper seismic design,a finite element model was established,considering the dual effects of permafrost degradation and material freeze-thaw deterioration.A comparative analysis was conducted to evaluate the influence mechanisms of various factors on the seismic performance of bridge pile foundations …

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Design And Simulation Evaluation Of Converged Toll Collection Schemes For Senegalese Highways, Lai Zengcheng, Zhang Ning, Yang Shichun, Ding Xueqi, Ji Yanjie Feb 2025

Design And Simulation Evaluation Of Converged Toll Collection Schemes For Senegalese Highways, Lai Zengcheng, Zhang Ning, Yang Shichun, Ding Xueqi, Ji Yanjie

Journal of China & Foreign Highway

The Senegalese highway toll collection system is inefficient,and significant congestion and delays frequently occur at toll stations in the face of sudden traffic surges during holidays.This paper examined the limitations of the existing toll collection methods on Senegalese highways and combined the image detection algorithm and electronic license plate recognition technology with the existing MTC and ETC toll collection methods to construct a converged toll collection method based on vehicle information recognition.The paper aimed to optimize the Senegalese highway toll collection system,reduce its cost of use,and improve the efficiency of toll collection.The BPV Thiès toll station in Senegal was selected …

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Model Test On Bearing Capacity Of Gravity Anchor Foundation Considering Rock Socketed Effect, Yin Jingze, Guo Chao, Zhang Xinmin, Li Wei, Shi Haiyang, Fu Baiyong Feb 2025

Model Test On Bearing Capacity Of Gravity Anchor Foundation Considering Rock Socketed Effect, Yin Jingze, Guo Chao, Zhang Xinmin, Li Wei, Shi Haiyang, Fu Baiyong

Journal of China & Foreign Highway

The calculation of the bearing capacity of traditional gravity anchor foundation instructed by Code for Design of Ground Base and Foundation of Highway Bridges and Culverts (JTG D 63—2007 ) only considers the friction effects of the basement and neglects the rock socketed effect of bottom plate,which is simply regarded as a safety margin,on the improvement of bearing capacity.To study the influence of rock socketed effect on the bearing capacity of gravity anchor,this paper designed two groups of indoor scale model tests on non-rock-socketed and rock-socketed gravity anchors with a scale of 1∶50 to discuss the bearing capacity and load …

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Theoretical And Experimental Studies On Adaptive Spatial Rotating Main Cable Saddle, Chen Yuanlin, Huang Anming, Chen Long, Xie Jun Feb 2025

Theoretical And Experimental Studies On Adaptive Spatial Rotating Main Cable Saddle, Chen Yuanlin, Huang Anming, Chen Long, Xie Jun

Journal of China & Foreign Highway

To ensure the accuracy of the main cable alignment during adaptive rotation,an adaptive spatial rotating main cable saddle suitable for spatial suspension bridges was designed.The main cable saddle had two adaptive rotating pair mechanisms with axes passing through the IP point.By using a specific suspension bridge as a case study,the design was validated through a combination of finite element analysis and model testing to assess the reliability and structural safety of the adaptive rotation mechanism.The results show that the adaptive spatial rotating main cable saddle can automatically adjust its orientation based on variations in the main cable load during construction,with …

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Section Form Of Open-Cut Tunnel By Ultra-Large-Diameter Shield Empty-Push Technology, Sun Chao, Zhang Guangwei Feb 2025

Section Form Of Open-Cut Tunnel By Ultra-Large-Diameter Shield Empty-Push Technology, Sun Chao, Zhang Guangwei

Journal of China & Foreign Highway

Based on the engineering background of the open-cut section by the shield machine with overall movement in the rapid transformation project of Wanghai Road,Shenzhen City,the structural stress and economy of three types of section forms under construction and operation conditions were analyzed to determine the optimal section design.The load-structure model was used to analyze the parameters affecting the internal force of the optimal section.The research results show that the top and bottom plates and side walls in the scheme with ribs set at the corner (scheme 3) have uniform force,and force during the construction period is close to that during …

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Application Of Superelevation Detection Technology In Ship Collision Prevention System Of Cross-Sea Bridges, Song Xiaodong, Duan Min, Ren Quanli, Hu Jianan, Yang Naiheng, Chen Jingwen, Tong Jianrong Feb 2025

Application Of Superelevation Detection Technology In Ship Collision Prevention System Of Cross-Sea Bridges, Song Xiaodong, Duan Min, Ren Quanli, Hu Jianan, Yang Naiheng, Chen Jingwen, Tong Jianrong

Journal of China & Foreign Highway

Cross-sea bridges are an important component of national infrastructure and an important regional transportation hub,which have a significant impact on economic development,regional integration,and cultural exchange.Ship superelevation is an important factor that threatens the safety of bridges.Therefore,superelevation detection is an important means to improve the service level of channel navigation,standardize the navigation order of ships in the water area near the bridge,and enhance the ship collision prevention ability of bridges.This paper conducted theoretical analysis and engineering feasibility research on superelevation detection by using laser alignment,laser ranging,optoelectronic detection,LiDAR detection,and machine vision.According to the superelevation detection requirements of the Hong Kong-Zhuhai-Macao Bridge,two technical …

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Industrial Design And Economic Analysis Of Steel Box Girder Bridge With Conventional Span, Cui Bing, Chen Kun Feb 2025

Industrial Design And Economic Analysis Of Steel Box Girder Bridge With Conventional Span, Cui Bing, Chen Kun

Journal of China & Foreign Highway

To improve the industrial construction level of steel bridges,a prefabricated continuous steel box girder bridge was designed in this study,which is suitable for bidirectional four lanes and six lanes with spans ranging from 40 m to 80 m.The overall dimensions and local structures of the steel box girder bridge were determined according to the specifications and engineering experience,and the load-bearing capacity was checked.Modular industrial products were designed by defining the vertical and horizontal modular divisions for the steel box girders,resulting in 21 standardized modular components.Based on the concept of life cycle,an economic analysis of the prefabricated steel box girder bridge …

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Mechanism Of Mud Pumping On Plateau Highway Under Traffic Loads And Its Treatment Strategy, Zhang Junhui, Chen Zhide, Gao Feng, Na Qicai, Ma Pengfei, Xiao Lin Feb 2025

Mechanism Of Mud Pumping On Plateau Highway Under Traffic Loads And Its Treatment Strategy, Zhang Junhui, Chen Zhide, Gao Feng, Na Qicai, Ma Pengfei, Xiao Lin

Journal of China & Foreign Highway

The dynamic hydraulic response and particle migration of subgrade structures under traffic loads are fundamental to reveal the formation and development mechanisms of mud pumping.The driving mechanism of fine particle migration in the mud pumping state was explored by conducting laboratory tests on layered gravel-sandy silt columns under dynamic loads.The results show that the slurry sloshing causes alternating positive and negative pressure gradients within the gravel layer.This oscillating pressure gradient enhances the pore permeability in the underlying sandy silt layer,providing the necessary hydrodynamic conditions for fine particle migration.Fine particle migration increases the slurry turbidity to a stable value.Upon the removal …

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Risk Zoning Of Hazards Along Highways To Xizang Based On Information Model, Liu Weimin, Guo Guanmiao, Cai Qing ’E, Yu Xueyong, Dong Xiaobo, Chen Peicong Feb 2025

Risk Zoning Of Hazards Along Highways To Xizang Based On Information Model, Liu Weimin, Guo Guanmiao, Cai Qing ’E, Yu Xueyong, Dong Xiaobo, Chen Peicong

Journal of China & Foreign Highway

The frequent occurrence of hazards along the highways in the Qinghai ‒ Xizang Plateau seriously affects road traffic and threatens the security of lives and property of the people.Conducting a risk zoning assessment of hazards along the highways to Xizang is crucial to enhancing hazard prevention and mitigation.This paper summarized the regional geological environment and development patterns of hazards along the highways to Xizang and analyzed the overall performance of highway traffic operations.On this basis,the Xinjiang‒Xizang Highway was taken as the research object,and the evaluation factors were selected based on the regional geological environment and the main controlling factors of …

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Influence Of Urease-Induced Calcium Carbonate Precipitation On Frost Heave Characteristics Of Saline Soil, Li Jue, Wen Zili, Liu Zhengnan Feb 2025

Influence Of Urease-Induced Calcium Carbonate Precipitation On Frost Heave Characteristics Of Saline Soil, Li Jue, Wen Zili, Liu Zhengnan

Journal of China & Foreign Highway

This study investigated the impact of the soybean urease-induced calcium carbonate precipitation (SICP ) technique on frost heave characteristics of saline soil,specifically addressing the frost heave in saline soil used as a subgrade.The relationships between compaction degree,moisture content,volume ratio of the reaction liquid,and curing temperature with the frost heave rate of treated soil were explored.The results show that SICP significantly reduces the frost heave rate of soil samples by over 28%,with the most noticeable improvement occurring under conditions of higher compaction degree and lower moisture content.Additionally,the increased volume ratio of reaction liquid enhances reaction efficiency,while lower curing temperatures are crucial …

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Prediction And Evaluation Of Road Service Performance In Cold Regions Based On Uncertainty Quantification Theory, Liu Yuanyuan, Si Junling, Zheng Hao, Ren Daoju, Fan Shaobing, Quan Lei Feb 2025

Prediction And Evaluation Of Road Service Performance In Cold Regions Based On Uncertainty Quantification Theory, Liu Yuanyuan, Si Junling, Zheng Hao, Ren Daoju, Fan Shaobing, Quan Lei

Journal of China & Foreign Highway

In cold regions,road service performance is influenced by various nonlinear dynamic factors under complex hydrothermal environments and freeze-thaw cycles.Traditional empirical and mechanical models exhibit significant limitations in comprehensively considering the impacts of complex environments and conducting quantitative analyses.This study proposed a method to predict and assess the service performance of constructed roads in cold regions.The method integrated deep neural networks with uncertainty quantification theory,addressing the inadequacies of existing models in adapting to complex environments and analyzing multiple influencing factors.By utilizing data from Montana road sections in the LTPP database,the study employed deep neural networks to predict the international roughness index …

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Permanent Deformation Prediction Model Of Subgrade Soil Under Freeze-Thaw Cycles Based On Lstm And Transformer, Zhang Anshun Feb 2025

Permanent Deformation Prediction Model Of Subgrade Soil Under Freeze-Thaw Cycles Based On Lstm And Transformer, Zhang Anshun

Journal of China & Foreign Highway

To accurately predict the permanent deformation of subgrade soil under the coupling effect of freeze-thaw cycles and traffic loads,a hybrid neural network model based on long short-term memory (LSTM ) and Transformer was proposed,building upon the results of dynamic triaxial tests.This model effectively captured the temporal dependencies and complex interactive effects among input variables,thereby significantly enhancing the accuracy and generalization ability of permanent deformation prediction of subgrade soil.The results indicate that higher confining pressure improves the resistance of subgrade soil to deformation,but its permanent deformation behavior is still significantly influenced by the magnitude of cyclic loading and the number of …

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