Proceedings of the Institution of Civil Engineers - Geotechnical Engineering最新文献

A method for calculating the lateral earth pressure on rigid anti-slip piles with EPS inclusions 带有发泡聚苯乙烯（EPS）夹杂物的刚性抗滑桩侧向土压力计算方法

Proceedings of the Institution of Civil Engineers - Geotechnical Engineering Pub Date : 2024-07-16 DOI: 10.1680/jgeen.24.00276

Shi Wang, Junjie Wang, Yuyan Chen, Yufang Zhang

{"title":"A method for calculating the lateral earth pressure on rigid anti-slip piles with EPS inclusions","authors":"Shi Wang, Junjie Wang, Yuyan Chen, Yufang Zhang","doi":"10.1680/jgeen.24.00276","DOIUrl":"https://doi.org/10.1680/jgeen.24.00276","url":null,"abstract":"Expanded polystyrene (EPS) inclusions are placed between rigid anti-slip pile-free sections and slopes, causing soil displacement and transforming the lateral earth pressure from a static to an active state. This study proposes a calculation method for estimating the lateral pressure on rigid anti-slip piles with EPS inclusions based on the deformation coordination of the rigid pile–EPS geofoam–soil composite system and soil-arching effect behind the pile using the polar coordinate translation and oblique differential-unit methods. A FLAC3D numerical model, designed to verify the theoretical results and analyse the effect of load reduction due to EPS inclusions, confirmed the validity of the proposed calculation method. The load-reduction effect of EPS inclusions were positively and negatively correlated with the thickness and elastic modulus of the EPS specimen, respectively. Finally, three EPS-inclusion design methods are proposed; specimens manufactured by the first two methods facilitate both the load-reduction effect and poor economic efficiency, whereas those manufactured by the third method show excellent load reduction with economic efficiency. The results of this study contribute significantly towards research on EPS inclusions that could facilitate high-performance engineering and construction applications.","PeriodicalId":509438,"journal":{"name":"Proceedings of the Institution of Civil Engineers - Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141644059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A method for predicting deformation field of deep foundation pit considering spatial effect 考虑空间效应的深基坑变形场预测方法

Proceedings of the Institution of Civil Engineers - Geotechnical Engineering Pub Date : 2024-06-04 DOI: 10.1680/jgeen.23.00096

Lijuan Luo, Yunxin Zheng, Rui Wang, Xiang Ren, Yonghui Zhang

{"title":"A method for predicting deformation field of deep foundation pit considering spatial effect","authors":"Lijuan Luo, Yunxin Zheng, Rui Wang, Xiang Ren, Yonghui Zhang","doi":"10.1680/jgeen.23.00096","DOIUrl":"https://doi.org/10.1680/jgeen.23.00096","url":null,"abstract":"Urban underground spaces have experienced significant development and utilization due to the rapid progress of urban construction and continuous advancements in construction technology. The number of foundation-pit projects immediately adjacent to buildings, structures, and pipelines has been increasing. Ensuring the safety of construction and surrounding facilities, it is essential to predict deformation caused by foundation pit excavations. In this study, a simple calculation method was proposed for predicting deformation of an envelope structure and surface settlement caused by deep foundation excavation with spatial effects. Firstly, the principle of minimum potential energy was applied and the lateral displacement equation of the envelope structure was derived, considering spatial deformation effects. Secondly, based on linear elasticity theory, a surface settlement expression was formulated utilizing the plane strain boundary. Finally, the stratigraphic loss method was used to establish a connection between horizontal envelope deformation and surface settlement, allowing for calculations of surface settlement at any position behind the envelope structure. The effectiveness and practicability of the proposed method were demonstrated by comparison of two existing foundation-pit engineering examples.","PeriodicalId":509438,"journal":{"name":"Proceedings of the Institution of Civil Engineers - Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141268280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Incorporating inherited variability into the drainage effect analysis of piezocone tests in gold tailings 将遗传变异纳入金尾矿压陷试验的排水效应分析中

Proceedings of the Institution of Civil Engineers - Geotechnical Engineering Pub Date : 2024-06-03 DOI: 10.1680/jgeen.23.00082

G. Dienstmann, Letícia Perini, André Luis Meier, Natália Ziesmann, Juliano Pasa de Campos

{"title":"Incorporating inherited variability into the drainage effect analysis of piezocone tests in gold tailings","authors":"G. Dienstmann, Letícia Perini, André Luis Meier, Natália Ziesmann, Juliano Pasa de Campos","doi":"10.1680/jgeen.23.00082","DOIUrl":"https://doi.org/10.1680/jgeen.23.00082","url":null,"abstract":"The piezocone test (CPTu) is a commonly used field investigation method for analyzing the geomechanical behavior of mine tailings. However, the effect of drainage conditions on CPTu measurements is a critical factor in assessing tailings properties, particularly as tailings are often characterized as silty materials with intermediate permeability. Previous studies of drainage conditions have been hindered by the high variability of tailings materials, leading to considerable dispersion in experimental results. To address this challenge, the present paper proposes a numerical approach to characterize and incorporate the inherent variability of tailings to identify probabilistic limits of drainage. This approach involves characterizing site statistics through piezocone tests and incorporating this variability into a set of Monte Carlo analyses using cavity expansion theory. The results indicate that the probabilistic analysis accurately represents the variability of the normalized resistance, although there is a greater discrepancy when considering pore pressure measurements. As a practical application, probabilistic values of cone resistance were used to establish profiles of fully drained and undrained tests. These corrected profiles can then be used in load capacity methods, providing rational limits of behavior.","PeriodicalId":509438,"journal":{"name":"Proceedings of the Institution of Civil Engineers - Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141269592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of sand subgrade seepage erosion caused by buried pipeline leakage 对埋地管道泄漏造成的砂土路基渗流侵蚀的评估

Proceedings of the Institution of Civil Engineers - Geotechnical Engineering Pub Date : 2024-06-03 DOI: 10.1680/jgeen.23.00133

Wenxin Chen, Yekai Chen, Zhihang Su, Liyuan Zhao, Xianghua Chen

{"title":"Evaluation of sand subgrade seepage erosion caused by buried pipeline leakage","authors":"Wenxin Chen, Yekai Chen, Zhihang Su, Liyuan Zhao, Xianghua Chen","doi":"10.1680/jgeen.23.00133","DOIUrl":"https://doi.org/10.1680/jgeen.23.00133","url":null,"abstract":"Leakage from buried pipelines can lead to an increase in the water content of the subgrade soils and a rise in the water table, leading to soil loosening, erosion, and ultimately the formation of hidden voids and roadway collapses. This study presents a Discrete Element Method (DEM) and validates its accuracy by utilizing cavity data from model experiments. It investigates the mechanism of seepage erosion resulting from pipe leakage and analyzes the development of the soil arch effect. Furthermore, it discusses the influence of sand void ratio and particle size on sand seepage erosion. The results indicate that the erosion area is primarily affected by the void ratio and particle size. In comparison to soil particles ranging from 0.1 mm to 5 mm and 2 mm to 5 mm, those with sizes between 0.1 mm and 2 mm generate areas of erosion and loosening that are approximately 40% larger. The proposed model offers a precise analysis of the developmental process and the extent of seepage erosion, thereby contributing to the prediction of potential road cavity areas based on dynamic changes in key factors such as subgrade soil type and groundwater level.","PeriodicalId":509438,"journal":{"name":"Proceedings of the Institution of Civil Engineers - Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141272104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of energy transfer and stress wave propagation during SPT through energy measurement and PIV 通过能量测量和 PIV 研究 SPT 过程中的能量传递和应力波传播

Proceedings of the Institution of Civil Engineers - Geotechnical Engineering Pub Date : 2024-06-02 DOI: 10.1680/jgeen.23.00320

E. Wong, E. H. Y. Sze, P. W. K. Chung, L. N. Y. Wong

{"title":"Study of energy transfer and stress wave propagation during SPT through energy measurement and PIV","authors":"E. Wong, E. H. Y. Sze, P. W. K. Chung, L. N. Y. Wong","doi":"10.1680/jgeen.23.00320","DOIUrl":"https://doi.org/10.1680/jgeen.23.00320","url":null,"abstract":"The blow counts in standard penetration tests (SPT) require suitable corrections to account for energy losses. Over 4,000 energy measurement data collected from four test sites across Hong Kong have been collected and analysed in this study. On average for all instrumented hammer blows, approximately 62% of the theoretical hammer potential energy is transferred to the drill rod assembly. Using high-speed camera imagery and particle image velocimetry (PIV), the detailed mechanism of stress wave propagation has been visualised and assessed. This has revealed new details and allowed nuances in the results of routine energy measurements to be interpreted in new light. It has been confirmed that the initial compressive wave is reflected as a tensile wave for low end-restraint at the SPT sampler and as a second compressive wave for high end-restraint. The commonly observed discrepancy between the theoretical and measured speeds of wave propagation is highlighted and explored. Energy loss arises from friction during free-fall of the hammer, at the anvil, and from other sources such as the horizontal motion of the hammer-anvil system. The proportion of each major source of energy loss is quantified.","PeriodicalId":509438,"journal":{"name":"Proceedings of the Institution of Civil Engineers - Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141273822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Protective effects of measures for railway subgrade adjacent to excavation of a parallel pit 在挖掘平行基坑时对邻近铁路路基采取保护措施的效果

Proceedings of the Institution of Civil Engineers - Geotechnical Engineering Pub Date : 2024-04-14 DOI: 10.1680/jgeen.23.00139

Honggui Di, Bochuan Wang, Shunhua Zhou, Binglong Wang, Fugui Song

{"title":"Protective effects of measures for railway subgrade adjacent to excavation of a parallel pit","authors":"Honggui Di, Bochuan Wang, Shunhua Zhou, Binglong Wang, Fugui Song","doi":"10.1680/jgeen.23.00139","DOIUrl":"https://doi.org/10.1680/jgeen.23.00139","url":null,"abstract":"The Hongqiao Airport–Pudong Airport urban railway construction project in Shanghai, includes a 156.1-m-long deep strip foundation pit that runs closely parallel to the subgrade of the Shanghai–Hangzhou High-speed Railway, operating at 300 km/h. With a maximum excavation depth of 25.5 m and a minimum distance of only 10.6 m between the outer edge of the pit and the subgrade slope foot, controlling the deformation of the foundation pit in soft soil and ensuring the safe operation of the adjacent high-speed railway present significant challenges. Various protective measures were implemented to mitigate subgrade deformation caused by pit excavation, including partition excavations, 1.5-m-thick diaphragm walls, a servo steel strut system, isolation piles between the subgrade and diaphragm walls, and water-resistant barriers. The foundation pit, soil, and railway subgrade deformations during excavation were measured and analysed. The results demonstrate that the protective measures limited lateral diaphragm wall deformation to within 0.14% of the excavation depth. The maximum horizontal and vertical displacements of the subgrade caused by excavation were 3.2 mm and 1.5 mm, respectively. As a result, trains safely passed through this section at a limited speed of 120 km/h. The findings presented provide useful reference information for similar projects.","PeriodicalId":509438,"journal":{"name":"Proceedings of the Institution of Civil Engineers - Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140704684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of assembled H-shaped steel struts with servo system on the safe excavation of a subway station 带伺服系统的装配式 H 型钢支柱对地铁站安全挖掘的影响

Proceedings of the Institution of Civil Engineers - Geotechnical Engineering Pub Date : 2024-04-07 DOI: 10.1680/jgeen.23.00195

Xiao Bing Xu, Yi Huai Liang, Qi Hu, Hong Liang Yao, Wen Ming Shen

{"title":"Effect of assembled H-shaped steel struts with servo system on the safe excavation of a subway station","authors":"Xiao Bing Xu, Yi Huai Liang, Qi Hu, Hong Liang Yao, Wen Ming Shen","doi":"10.1680/jgeen.23.00195","DOIUrl":"https://doi.org/10.1680/jgeen.23.00195","url":null,"abstract":"This study introduced the innovative design of assembled H-shaped steel strut (AHSS) with servo system for the deep excavation of a T-shaped subway interchange station in soft soil. Through the analysis of field monitored axial force of strut, the horizontal displacement of retaining wall, the ground surface settlement and the displacement of nearby existing tunnel, it was found that the servo system could provide convincing stable axial force for each level of AHSS. When a new level of AHSS with servo system was put into operation, the axial force of the closest level of concrete strut above tended to be affected greater than the other levels of strut. The 1st level of concrete strut contributed much less to resisting horizontal displacement of diaphragm wall than the other levels of strut, and was under tension during the later stage of excavation. The maximum horizontal displacement of diaphragm wall, displacement of the existing tunnel and ground surface settlement were all controlled well with the operation of AHSS with servo system. Meanwhile, stricter control of the horizontal displacement for diaphragm wall in the early stage is considered to be beneficial to the control of the further deformation of excavation in the later stage.","PeriodicalId":509438,"journal":{"name":"Proceedings of the Institution of Civil Engineers - Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140733917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A nonlinear stress-strain relationship for soil and rock 土壤和岩石的非线性应力应变关系

Proceedings of the Institution of Civil Engineers - Geotechnical Engineering Pub Date : 2024-03-27 DOI: 10.1680/jgeen.22.00108

Gary Norris, Horng-Jyh Yang

{"title":"A nonlinear stress-strain relationship for soil and rock","authors":"Gary Norris, Horng-Jyh Yang","doi":"10.1680/jgeen.22.00108","DOIUrl":"https://doi.org/10.1680/jgeen.22.00108","url":null,"abstract":"While many employ a hyperbolic stress-strain relationship for soils, it is known that such a relationship is accurate over either the small strain range as encountered in earthquake and soil dynamics problems or a relationship with different input parameters that are needed over large strains as is required for finite element analyses of large deformation behavior. The two characterizations do not become one. A proposed power relationship is presented that was developed to characterize the triaxial test stress-strain behavior of cohesionless material from lubricated or “frictionless” cap and base tests (some 144 tests) covering a range in the natural variation in particle size, particle shape and surface roughness, over low to high confining pressure. This relationship covers the range in strain from 10−6 to soil failure. It has been used successfully to date in laterally loaded pile response characterization (the Strain Wedge Model) and shallow foundation load-settlement-bearing capacity response. Most recently, it has been extended to assess the behavior of rock-like material (caliche). The relationship and its comparison with the hyperbolic relationship for large strain and the shear modulus reduction curve for seismic behavior are presented here.","PeriodicalId":509438,"journal":{"name":"Proceedings of the Institution of Civil Engineers - Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140373450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Advancing landslide early warning systems through saturation monitoring and predictive analysis 通过饱和监测和预测分析推进滑坡预警系统

Proceedings of the Institution of Civil Engineers - Geotechnical Engineering Pub Date : 2024-02-12 DOI: 10.1680/jgeen.23.00037

Prashant Sudani, K.A. Patil

{"title":"Advancing landslide early warning systems through saturation monitoring and predictive analysis","authors":"Prashant Sudani, K.A. Patil","doi":"10.1680/jgeen.23.00037","DOIUrl":"https://doi.org/10.1680/jgeen.23.00037","url":null,"abstract":"The landslide occurrence is most common in the rainy season, costing deep damage to the infrastructure and human lives. An early prediction framework for such a disaster can help to mitigate damages. For this reason, in this work, a prediction framework for shallow landslide initiation is developed and validated with a real case study. In order to test the reliability of the prediction framework, a back analysis of a recent landslide accrued in the study area, Malin village of Maharashtra, on July 2014 was performed. Relations of landslide stability with the water saturation were established through a physically based approach using the Geo-Studio analysis module. A leaky barrel algorithm was developed for the study locations to monitor rainfall's effect on water saturation. Simulation results of landslide stability were compared with the leaky barrel-based rainfall-water saturation algorithm. The result confirms the good predictability of landslide occurrence through a presented framework. The procedure presented in this paper for predicting shallow landslide occurrence is recommended for real-time monitoring of landslide-prone locations.","PeriodicalId":509438,"journal":{"name":"Proceedings of the Institution of Civil Engineers - Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139782529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Advancing landslide early warning systems through saturation monitoring and predictive analysis 通过饱和监测和预测分析推进滑坡预警系统

Proceedings of the Institution of Civil Engineers - Geotechnical Engineering Pub Date : 2024-02-12 DOI: 10.1680/jgeen.23.00037

Prashant Sudani, K.A. Patil

{"title":"Advancing landslide early warning systems through saturation monitoring and predictive analysis","authors":"Prashant Sudani, K.A. Patil","doi":"10.1680/jgeen.23.00037","DOIUrl":"https://doi.org/10.1680/jgeen.23.00037","url":null,"abstract":"The landslide occurrence is most common in the rainy season, costing deep damage to the infrastructure and human lives. An early prediction framework for such a disaster can help to mitigate damages. For this reason, in this work, a prediction framework for shallow landslide initiation is developed and validated with a real case study. In order to test the reliability of the prediction framework, a back analysis of a recent landslide accrued in the study area, Malin village of Maharashtra, on July 2014 was performed. Relations of landslide stability with the water saturation were established through a physically based approach using the Geo-Studio analysis module. A leaky barrel algorithm was developed for the study locations to monitor rainfall's effect on water saturation. Simulation results of landslide stability were compared with the leaky barrel-based rainfall-water saturation algorithm. The result confirms the good predictability of landslide occurrence through a presented framework. The procedure presented in this paper for predicting shallow landslide occurrence is recommended for real-time monitoring of landslide-prone locations.","PeriodicalId":509438,"journal":{"name":"Proceedings of the Institution of Civil Engineers - Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139842525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0