Computers and Geotechnics最新文献

Stability of conical foundations on anisotropic clay: A comprehensive three-dimensional study on V-H-M failure envelopes 各向异性粘土上锥形地基的稳定性：关于 V-H-M 破坏包络的综合三维研究

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-11-16 DOI: 10.1016/j.compgeo.2024.106906

Duy Tan Tran , Jim Shiau , Van Qui Lai , Suraparb Keawsawasvong

{"title":"Stability of conical foundations on anisotropic clay: A comprehensive three-dimensional study on V-H-M failure envelopes","authors":"Duy Tan Tran , Jim Shiau , Van Qui Lai , Suraparb Keawsawasvong","doi":"10.1016/j.compgeo.2024.106906","DOIUrl":"10.1016/j.compgeo.2024.106906","url":null,"abstract":"<div><div>This paper is concerned with the <em>V-H-M</em> failure envelopes for conical foundations under combined loadings on anisotropic clay. The study employs the three-dimensional finite element limit analysis (3D FELA) technique and utilizes the well-established Anisotropic Undrained Shear (AUS) failure criteria. The focus of the study is on evaluating the influences of the cone apex angle (<em>β</em>) and the anisotropic factor (<em>r<sub>e</sub></em>) on the bearing capacity of conical foundations subjected to external forces of vertical force (<em>V</em>), horizontal force (<em>H</em>), and moment (<em>M</em>). The combinations of <em>V-H</em>, <em>V-M</em>, and <em>H-M</em> load spaces are analyzed using dimensionless output parameters (<em>V/s<sub>uTC</sub>A</em>, <em>H/s<sub>uTC</sub>A</em>, <em>M/s<sub>uTC</sub>AD</em>), and the various characteristics of failure mechanisms of the conical foundation are examined. Alongside FELA, the study introduces an innovative machine learning approach using Categorical Boosting (CATBoost), Extreme Gradient Boosting (XGBoost), and Gradient Boosting Machine (GBM) to evaluate the correlation between input parameters and their outcomes. The proposed machine learning models are rigorously verified and validated with the CATBoost model, showing exceptional agreement with numerical results, as demonstrated by an impressive R<sup>2</sup> value of 99.99 %. The present study is a practical and efficient method for evaluating the 3D failure envelope of conical foundations on anisotropic clay under general loading conditions in (<em>V-H-M</em>) space.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106906"},"PeriodicalIF":5.3,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","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 the connection mode on the dynamic characteristics of the pile-wheel composite foundation for offshore wind turbines 连接模式对海上风力涡轮机桩轮复合地基动态特性的影响

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-11-15 DOI: 10.1016/j.compgeo.2024.106908

Zijian Yang, Xinjun Zou, Minhua Zhou, Lanyi Huang

{"title":"Effect of the connection mode on the dynamic characteristics of the pile-wheel composite foundation for offshore wind turbines","authors":"Zijian Yang, Xinjun Zou, Minhua Zhou, Lanyi Huang","doi":"10.1016/j.compgeo.2024.106908","DOIUrl":"10.1016/j.compgeo.2024.106908","url":null,"abstract":"<div><div>This study elucidates the horizontal vibration response of the monopile-wheel composite foundation in terms of coupled arrangement. In this paper, the displayed expression of the lateral resistance and resisting moment provided by the rotating wheel and embedded pile are represented by using the linear elastic Winkler foundation model, in which the springs and dashpot coefficients are derived by Biot’s poroelastic theory and plane-strain model. The hydrodynamic force along the foundation shaft is obtained by the radiation wave theory. A connection degree coefficient is defined to describe the change of wheel action. Then, the dynamic governing equations for the vibrating pile based on the Timoshenko beam theory are re-established. Combined with foundation bottom boundary condition, the frequency domain analytical solutions for the horizontal and rocking impedances at the head of the composite foundation are obtained. A comparison with some existing results is carried out to verify the correctness and reasonableness of the proposed model. Finally, systematic studies are conducted to analyze the horizontal vibration characteristics of the innovative foundation under different pile-wheel connection mode. The results from these calculation examples show that the pile-wheel composite foundation with decoupled or coupled arrangement has its own advantages in resisting deformation.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106908"},"PeriodicalIF":5.3,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142652684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Particle shape distribution effects on the critical strength of granular materials 颗粒形状分布对颗粒材料临界强度的影响

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-11-13 DOI: 10.1016/j.compgeo.2024.106896

Sergio Carrasco , David Cantor , Carlos Ovalle , Frédéric Dubois

{"title":"Particle shape distribution effects on the critical strength of granular materials","authors":"Sergio Carrasco , David Cantor , Carlos Ovalle , Frédéric Dubois","doi":"10.1016/j.compgeo.2024.106896","DOIUrl":"10.1016/j.compgeo.2024.106896","url":null,"abstract":"<div><div>This study investigates the influence of correlations between particle morphology and gradation on the critical shear strength of three-dimensional granular assemblies via numerical simulations. While grain shape is acknowledged to play a central role in the mechanical behavior of granular media, only a few works have explored the combined effects of grain shapes varying with grain size. Employing three-dimensional discrete-element simulations, we explore the shear behavior of samples with diverse particle size distributions, where grain shapes (ranging from spheres to very angular polyhedra) are assigned based on the relative size of each particle. Using drained triaxial shear tests, we analyze the macroscopic behavior up to large deformation levels. Micro-mechanical analyses are also conducted to understand the underlying mechanisms governing the observed macroscopic behavior, highlighting the role of grain connectivity and force transmission. Surprisingly, well graded samples composed of coarse angular grains and fine rounded ones are not capable of developing higher shear strengths than uniform samples with the same diversity on grain shapes. Conversely, samples where coarser grains are rounded and fines are angular, show constant shear strength as the particle size distribution becomes broader. These findings underscore the importance of simultaneously considering grain size and shape distributions for the assessment of realistic granular soil behavior.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106896"},"PeriodicalIF":5.3,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142652997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of elastoplastic constitutive model of rubber-sand mixture 橡胶-砂混合物弹塑性结构模型研究

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-11-13 DOI: 10.1016/j.compgeo.2024.106904

Zhen-Dong Cui, Min-Zhe Xu, Xiao-Dong Wang

{"title":"Investigation of elastoplastic constitutive model of rubber-sand mixture","authors":"Zhen-Dong Cui, Min-Zhe Xu, Xiao-Dong Wang","doi":"10.1016/j.compgeo.2024.106904","DOIUrl":"10.1016/j.compgeo.2024.106904","url":null,"abstract":"<div><div>The rubber-sand mixture (RSM) has been extensively applied in the engineering construction as a lightweight filling material. However, the mechanical characteristics of RSMs are still not completely understood and the constitutive model used to simulate the RSMs by FEM analysis is also lacking. This study presents a newly developed constitutive model based on the critical state framework that describes the stress–strain relationship and dilatancy behavior of RSMs with different rubber contents. The relationship between rubber contents and critical state parameters was introduced in the established constitutive model. The comparisons of test results and model calculations show the RSM model can better capture the strain softening behavior, dilatancy characteristics and the critical state of RSMs. The RSM model was compiled by the user-defined material (UMAT) in ABAQUS and then utilized to simulate the triaxial tests. The developed RSM model is suitable for the triaxial compressive test using monotonic radial loading in triaxial space. The calculation results demonstrate the correctness and effectiveness of the developed model, which can be used as a reference in the engineering practice.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106904"},"PeriodicalIF":5.3,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","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 the shear stiffness and load redistribution of framed structures affected by tunnelling 评估受隧道工程影响的框架结构的剪切刚度和荷载重新分布情况

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-11-13 DOI: 10.1016/j.compgeo.2024.106899

Jingmin Xu , Zehui Yu , Rui Chen , Tao Xu , Churong Chen , Ziqi Wang

{"title":"Evaluation of the shear stiffness and load redistribution of framed structures affected by tunnelling","authors":"Jingmin Xu , Zehui Yu , Rui Chen , Tao Xu , Churong Chen , Ziqi Wang","doi":"10.1016/j.compgeo.2024.106899","DOIUrl":"10.1016/j.compgeo.2024.106899","url":null,"abstract":"<div><div>This technical note examines the shear distortion of plane strain framed structures resulting from tunnelling-induced surface differential settlements. An equation for calculating the shear stiffness is derived, considering various structural parameters. The effectiveness of the proposed method is validated through both experimental and finite element modeling results, with its accuracy emphasized by comparison with existing methods. Additionally, a method for estimating the redistribution of pressure beneath the foundation of plane strain framed buildings due to tunnelling is proposed and validated through numerical simulations which adopt an advanced soil constitutive model. The parametric study further demonstrates the applicability of the proposed methods for estimating shear stiffness in three-dimensional structures characterized by similar vertical wall and horizontal slab stiffness. The research findings provide tunnelling engineers with a tool for the rapid estimation of shear stiffness in framed structures and a reliable evaluation of pressure redistribution beneath foundations caused by tunnelling.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106899"},"PeriodicalIF":5.3,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

DEM Validation for impact Wave propagation in dry sand: A comparison with experimental results 干砂中冲击波传播的 DEM 验证：与实验结果的比较

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-11-13 DOI: 10.1016/j.compgeo.2024.106901

K Balamonica , Goh Siang Huat

引用次数: 0

Compression characteristics and particle scale stress distribution of sand-rubber mixtures with particle size disparity effect 具有粒度差异效应的砂橡胶混合物的压缩特性和颗粒尺度应力分布

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-11-12 DOI: 10.1016/j.compgeo.2024.106905

Deyun Liu , Zhen-Yu Yin

{"title":"Compression characteristics and particle scale stress distribution of sand-rubber mixtures with particle size disparity effect","authors":"Deyun Liu , Zhen-Yu Yin","doi":"10.1016/j.compgeo.2024.106905","DOIUrl":"10.1016/j.compgeo.2024.106905","url":null,"abstract":"<div><div>This research investigates the particle-scale stress transmission characteristics at the end of isotropic consolidation stage for sand-rubber mixtures, focusing on the effects of particle size disparity, density, and stress levels. The discrete element method was adopted with total 450 simulations being conducted for sand-rubber mixtures with increasing size disparities to quantify the particle-scale stress distribution between sand and rubber materials. This study reveals that the variation of coordination number and void ratio for sand-rubber mixtures align with those observed in conventional gap-graded soils, while the inclusion of deformable rubber clumps significantly increases coordination number values. A complex interplay between packing density and stress level was evident, illustrating the nuanced role of rubber in stress transmission. As packing density and stress levels decrease, the efficacy of deformable rubber clumps in stress transfer increases. An inverse relationship between the efficiency of stress transmission and particle size disparity was observed for all these sand-rubber mixtures. The findings indicate that, despite variations in size disparity, the proportion of stress transferred by rubber remains consistently lower than their volumetric contribution. This study underscores the complexities of using sand-rubber mixtures and highlights that the effect of particle property disparity outweighs the that of particle property disparity.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106905"},"PeriodicalIF":5.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Coupled CFD-DEM modelling of clogging of granular columns by cohesive fines 粘性细粒堵塞颗粒柱的 CFD-DEM 耦合模型

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-11-12 DOI: 10.1016/j.compgeo.2024.106902

Thao Doan , Buddhima Indraratna , Thanh T. Nguyen , Cholachat Rujikiatkamjorn

{"title":"Coupled CFD-DEM modelling of clogging of granular columns by cohesive fines","authors":"Thao Doan , Buddhima Indraratna , Thanh T. Nguyen , Cholachat Rujikiatkamjorn","doi":"10.1016/j.compgeo.2024.106902","DOIUrl":"10.1016/j.compgeo.2024.106902","url":null,"abstract":"<div><div>The ubiquitous phenomenon of particle migration and clogging in porous media, particularly when involving cohesive fines necessitates a critical need for in-depth understanding from a microscale perspective. Therefore, this study aims to elucidate the migration and clogging behaviour of polydisperse cohesive fines across a granular medium by using the coupled Computational Fluid Dynamics-Discrete Element Method (CFD-DEM). Primary governing factors including the relative coarse–fine size ratio and the strength of interparticle cohesive force through the concept of bond number are examined in detail from both macro- and micromechanical perspectives. The results reveal that the presence of interparticle cohesion drastically modifies the migration of fine particles, associating with a notable reduction in the infiltration ratio and an increased likelihood of particle deposition. This study innovatively explores the combined effect of the coarse–fine size ratios and cohesive strength on the migratory behaviour of fines through the infiltration ratio and critical time ratio, whereby clogging carries substantial implications on the geo-hydraulic performance of the granular medium. Moreover, in the context of cohesive fines, the Authors propose a comprehensive and novel algorithm for detecting and analysing cohesion-induced agglomeration effect. The results reveal that the formation and breakage of agglomerates due to the metastability of cohesive bonds between fines can be captured to explain the unstable flows occurring through the clogged zones.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106902"},"PeriodicalIF":5.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142652994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simple and efficient geotechnical reliability-based design based on transformed limit state functions by target reliability-oriented sampling 通过以可靠性为导向的目标取样，基于变换后的极限状态函数，进行简单高效的岩土工程可靠性设计

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-11-12 DOI: 10.1016/j.compgeo.2024.106877

Bin Li , Yong-kai Shen , Zi-Jun Cao , Qi Wan , Chen-Zhe Ma

{"title":"Simple and efficient geotechnical reliability-based design based on transformed limit state functions by target reliability-oriented sampling","authors":"Bin Li , Yong-kai Shen , Zi-Jun Cao , Qi Wan , Chen-Zhe Ma","doi":"10.1016/j.compgeo.2024.106877","DOIUrl":"10.1016/j.compgeo.2024.106877","url":null,"abstract":"<div><div>This paper develops a novel reliability-based design (RBD) approach from a new perspective. The approach is relatively simple as it does not need direct reliability calculations for different designs and gives the critical design satisfying the target reliability requirement without involving a trial-and-error procedure. It specifies the critical design, which is unknown, as the one that achieves the limit state at its corresponding design point given a prescribed target reliability requirement. This is inverse to geotechnical reliability calculations based on the design point where the design point is determined for calculating the reliability, which is unknown, given a design. From this inverse perspective, geotechnical RBD is transformed into determination of a design point given a target reliability level and its corresponding design. In this study, this is accomplished by a target reliability-oriented sampling algorithm and transforming the original limit state function (LSF) to represent the design parameter as a function of uncertain parameters. The proposed approach is illustrated by three design examples. Results show that the proposed approach provides accurate design outcomes in a cost-effective way. It provides a useful complementary tool to existing RBD methods due to its simplicity and efficiency.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106877"},"PeriodicalIF":5.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142652996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A constitutive model of rock based on strain cone surface and the parameter calibration method with high efficiency 基于应变锥面的岩石构成模型及高效参数校准方法

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-11-12 DOI: 10.1016/j.compgeo.2024.106876

Jie Li , Shaobin Hou , Yalong Jiang , Helin Fu , Kaixun Hu

{"title":"A constitutive model of rock based on strain cone surface and the parameter calibration method with high efficiency","authors":"Jie Li , Shaobin Hou , Yalong Jiang , Helin Fu , Kaixun Hu","doi":"10.1016/j.compgeo.2024.106876","DOIUrl":"10.1016/j.compgeo.2024.106876","url":null,"abstract":"<div><div>The elastic and plastic strains of rock during the compression process cannot be accurately identified by common constitutive models. This paper investigated the strain evolution of rock under monotonic compressive load by referring to results from damage-controlled cyclic loading tests, and discussed the contradiction between the flow rule of traditional elastoplastic constitutive models and real plastic strain development. Therefore, a strain cone surface constitutive model was proposed, where the yield surface was replaced with strain cone surfaces for both elastic and plastic strains. The magnitude and direction of vectors regarding elastic and plastic strain increments occurring on these conical surfaces were explored. Then, the proposed model was validated against cyclic loading tests. Furthermore, a robust parameter calibration method was developed based on genetic algorithm, and its ability to search for optimal parameters was verified by comparing the simulated constitutive relationships with the practical stress–strain curves. The results show that the traditional flow rule could be incompatible with the real plastic strain variation. In contrast, the proposed model could accurately simulate the evolution of elastic and plastic strains, demonstrating high precision and applicability. Moreover, the calibration method enables the determination of model parameters with high accuracy and efficiency.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106876"},"PeriodicalIF":5.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142652995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0