Computers and Geotechnics最新文献_第8页

Ultimate lateral bearing capacity of rigid pile in clay considering soil stress history and scour-hole dimension 考虑土壤应力历史和冲孔尺寸的粘土中刚性桩的极限侧向承载力

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-10-30 DOI: 10.1016/j.compgeo.2024.106848

Mingke Lin , Changbing Qin , Siyu Li , Jiangtao Yi

{"title":"Ultimate lateral bearing capacity of rigid pile in clay considering soil stress history and scour-hole dimension","authors":"Mingke Lin , Changbing Qin , Siyu Li , Jiangtao Yi","doi":"10.1016/j.compgeo.2024.106848","DOIUrl":"10.1016/j.compgeo.2024.106848","url":null,"abstract":"<div><div>Rigid monopiles in a marine environment are frequently subjected to severe lateral loads and scour effects, which complicates the stability assessment of monopiles. This paper proposes a ‘double failure mechanism’ that integrates the meniscus-conical failure wedge and rotational failure model to evaluate the ultimate lateral bearing capacity of a rigid pile in clay under scour conditions. Considering the influence of scour-hole, three distinct failure modes are introduced based on the possible ranges of failure. The critical ‘double failure mechanism’ can satisfy both the force balance and the moment balance of the pile-soil system. Based on this framework, an analytical solution for the ultimate lateral bearing capacity of a rigid monopile with considerations of these three failure modes is derived using the limit equilibrium method. Additionally, the combined effects of additional stress and stress history on soil properties are accurately analyzed. The FEM results and existing theoretical solutions are employed to validate the derived limit equilibrium solution. Finally, the effects of scour-hole dimensions and load eccentricity on the ultimate lateral bearing capacity of a rigid monopile, wedge failure and rotational failure are investigated.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106848"},"PeriodicalIF":5.3,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553505","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

Numerical investigations of the mechanical properties and energy characteristics of sandy cobble strata considering its internal stochastic structures 考虑内部随机结构的砂卵石地层力学性能和能量特征的数值研究

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-10-30 DOI: 10.1016/j.compgeo.2024.106867

Fan Wang , Pengfei Li , Xiuli Du , Jianjun Ma , Lin Wang

{"title":"Numerical investigations of the mechanical properties and energy characteristics of sandy cobble strata considering its internal stochastic structures","authors":"Fan Wang , Pengfei Li , Xiuli Du , Jianjun Ma , Lin Wang","doi":"10.1016/j.compgeo.2024.106867","DOIUrl":"10.1016/j.compgeo.2024.106867","url":null,"abstract":"<div><div>Investigating the mechanical properties of sandy cobble strata is essential for optimizing the design and construction of urban tunnels, thereby controlling ground deformation and ensuring tunnel stability. This paper aims to comprehensively investigate the mechanical properties and energy characteristics of heterogeneous sandy cobble strata. Numerical simulations are employed to examine the stress–strain behavior and energy evolution mechanism in scenarios with and without interfaces between the soil matrix and blocks. Subsequent analysis focuses on elucidating the effects of the internal stochastic structures, which characterize heterogeneity, on the overall strength and energy characteristics. The results indicate that the presence of interfaces significantly compromises the overall strength, while exacerbating the occurrence of a tortuous plastic zone around blocks. The volumetric block proportion (<em>VBP</em>), which represents the volumetric content of cobbles, has a significant impact on the overall mechanical behaviour. In the context of high <em>VBP</em>, block sizes, counts and orientations play substantial roles. Finally, the discussion reveals that when blocks are modelled using the elastic model, the overall strength is significantly overestimated compared to the strain-softening and Mohr-Counlomb models, especially in scenarios with high <em>VBP</em> and in-situ stress. It provides an unsafe evaluation (i.e., overestimation) of tunnel stability.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106867"},"PeriodicalIF":5.3,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553508","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

Calibration and intelligent optimization for DEM numerical parameters in heterogeneous rock mass 校准和智能优化异质岩体中的 DEM 数值参数

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-10-30 DOI: 10.1016/j.compgeo.2024.106863

Runpeng Shang , Yugui Yang , Bingxiang Huang , Yong Chen , Chao Qiu , Wang Liu

{"title":"Calibration and intelligent optimization for DEM numerical parameters in heterogeneous rock mass","authors":"Runpeng Shang , Yugui Yang , Bingxiang Huang , Yong Chen , Chao Qiu , Wang Liu","doi":"10.1016/j.compgeo.2024.106863","DOIUrl":"10.1016/j.compgeo.2024.106863","url":null,"abstract":"<div><div>Calibrating meso parameters is a crucial step in modeling rock materials using the Distinct Element Method (DEM). Improved calibration methods integrating machine learning and optimization algorithms have been proposed to revise the time-consuming conventional trial-and-error approach. This study introduces an innovative calibration method for heterogeneous DEM numerical parameters, optimized with the improved DBO algorithm (IDBO) utilizing Latin Hypercube Sampling combined with Gaussian Processes (GP-LHS) for initialization and hybrid strategies for iteration. Findings suggest the proposed enhanced heterogeneous DEM calibration method can accurately reproduce laboratory results and similar material experiments. Additionally, this method performs better than the DBO-DEM, PSO-DEM, and GA-DEM calibration methods in heterogeneous DEM parameters calibration speed with the same accuracy requirement during unconfined compression tests. The findings affirm the potential of the method for heterogeneous DEM numerical parameters calibration.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106863"},"PeriodicalIF":5.3,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553509","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 plastic-damage cohesive zone model for shear rupture band in geomaterials under mixed-mode and cyclic loading 混合模式和循环加载下土工材料剪切断裂带的塑性破坏内聚区模型

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-10-30 DOI: 10.1016/j.compgeo.2024.106829

Xiao Miao, Daosheng Ling, Anhao Pan, Hai Wang

{"title":"A plastic-damage cohesive zone model for shear rupture band in geomaterials under mixed-mode and cyclic loading","authors":"Xiao Miao, Daosheng Ling, Anhao Pan, Hai Wang","doi":"10.1016/j.compgeo.2024.106829","DOIUrl":"10.1016/j.compgeo.2024.106829","url":null,"abstract":"<div><div>The characterization of the mechanical behavior of the shear rupture band is essential to the analysis of the strain localization failure of geotechnical structures, with a key focus on describing the plastic-damage behavior and dilatancy of the geomaterial. A novel plastic-damage cohesive zone model is presented based on the unified plastic-damage modeling framework, in which an enhanced dilatancy angle evolution law is put forward to capture the dilatancy, and the yield function and the dissipation potential function are proposed to account for the tension/compression-shear coupling effect. The capability of the proposed model is demonstrated by its constitutive responses under several typical monotonic and cyclic loading paths, and further validated by simulating three laboratory tests of rock joint and silt-steel interface. The notable agreement between the simulation results and their experimental counterparts illustrates the effectiveness of the proposed model in characterizing the mechanical behavior of the shear rupture band under mixed-mode and cyclic loading conditions, including post-peak hardening/softening, plastic-damage behavior, and hysteresis.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106829"},"PeriodicalIF":5.3,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553511","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

Upper bound stability analysis of single-layered slurry trenches in clay using the perturbation method 采用扰动法对粘土中的单层泥浆沟进行上限稳定性分析

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-10-30 DOI: 10.1016/j.compgeo.2024.106864

Tingzhen Tan , Maosong Huang , Zhenhao Shi

引用次数: 0

Efficient simulation of 3D conditional random field using kriging with Gaussian-process trend 利用具有高斯过程趋势的克里金法高效模拟三维条件随机场

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-10-30 DOI: 10.1016/j.compgeo.2024.106862

Jianye Ching , Ikumasa Yoshida

引用次数: 0

Ground-boundary scatter method for wavefield analysis of layered sites with single-faced arbitrarily stepped topographies 用于分析具有单面任意阶梯地形的层状场地波场的地界散射法

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-10-30 DOI: 10.1016/j.compgeo.2024.106858

Zhewen Hu , Jianbo Li , Gao Lin , Shukai Ya

{"title":"Ground-boundary scatter method for wavefield analysis of layered sites with single-faced arbitrarily stepped topographies","authors":"Zhewen Hu , Jianbo Li , Gao Lin , Shukai Ya","doi":"10.1016/j.compgeo.2024.106858","DOIUrl":"10.1016/j.compgeo.2024.106858","url":null,"abstract":"<div><div>This study proposes a ground-boundary scatter method for calculating wavefields in layered sites with stepped topographies. The total wavefield is decomposed into the free field of the flat site and the reflected wavefield from the ground. The wave-reflection equivalent forces are calculated through a dynamic analysis of the ground-boundary substructure intercepted from a full-domain site model. In the scattering analysis, a scaling-line-based scaled boundary finite-element method in the time domain is developed for the high-accuracy simulations of semi-infinity in an asymmetric layered half-space. A domain reduction method based on accurate wavefield solutions is used to analyze the soil–structure interaction. The proposed method makes complex topography-dependent wavefield calculations more flexible and practical, thus overcoming the limitations of traditional methods for seismic input. It can be used for localized arbitrarily shaped stepped topographies based on near-field finite-element models, thereby satisfying engineering requirements. The detailed implementation steps are described. For validation, numerical examples of wave propagation are for in homogeneous and layered stepped half-space containing valleys and irregular stepped terrains under different plane-wave incidence directions. The engineering applicability of this method is benchmarked through the seismic analyses of a nuclear structure built on different single-faced stepped-topography sites, revealing its potential adverse effects on structural response.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106858"},"PeriodicalIF":5.3,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553507","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

An insight into the effect of gas on pore clogging using a resolved CFD-DEM coupling model 利用解析的 CFD-DEM 耦合模型深入了解气体对孔隙堵塞的影响

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-10-30 DOI: 10.1016/j.compgeo.2024.106866

Tuo Wang , Zhenming Shi , Ming Peng , Mengli Li

{"title":"An insight into the effect of gas on pore clogging using a resolved CFD-DEM coupling model","authors":"Tuo Wang , Zhenming Shi , Ming Peng , Mengli Li","doi":"10.1016/j.compgeo.2024.106866","DOIUrl":"10.1016/j.compgeo.2024.106866","url":null,"abstract":"<div><div>Pore clogging phenomena are commonly encountered in porous media and have been extensively investigated. However, with the increasing prominence of fields like hydrate extraction and carbon dioxide (CO<sub>2</sub>) sequestration, which involve gas–liquid two-phase flow, the effect of gas on pore clogging remains largely unexplored. This study employed a coupled resolved computational fluid dynamics and discrete element method (CFD-DEM) in conjunction with the volume of fluid (VOF) method to simulate gas–liquid two-phase flow. In addition, scanned real particles and a truncated-cone pore are employed to simulate pore clogging process under fluid flow. The results indicate that the presence of gas intensifies the turbulence within the fluid field. Additionally, the interaction among gas, fluid, and particles increases the variability of the drag forces acting on the particles. These two factors lead to a decrease in particle pile stability and reduce the possibility of pore clogging. Moreover, the parameters study shows that with the increase of gas fraction, the fluctuation of particle drag force increases and the velocity of particles passing through pore increases. With the increase of constriction diameter, the velocity of particles passing through pore is accelerated, and the influence of gas is reduced.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106866"},"PeriodicalIF":5.3,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553504","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 state surface model of unsaturated soil considering thermal and adsorptive effects 考虑热效应和吸附效应的非饱和土壤状态面模型

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-10-30 DOI: 10.1016/j.compgeo.2024.106869

Shuang Liu , Yang Xiao , Yue Sun , Hao Cui , Guoliang Ma , Hanlong Liu

{"title":"A state surface model of unsaturated soil considering thermal and adsorptive effects","authors":"Shuang Liu , Yang Xiao , Yue Sun , Hao Cui , Guoliang Ma , Hanlong Liu","doi":"10.1016/j.compgeo.2024.106869","DOIUrl":"10.1016/j.compgeo.2024.106869","url":null,"abstract":"<div><div>Constructing soil water retention curve model involving thermal, mechanical, and hydraulic hysteresis is essential for accurately predicting the retention characteristics of unsaturated soils under complicated conditions. A novel model depicting the retention of capillary and adsorbed water under the impact of thermal, mechanical, and hydraulic hysteresis, has been proposed. In which, the variations of void ratio-dependent capillary water have been captured based on the incremental relationship of a three-phase porous material and an empirical relationship. The impact of temperature has been described by incorporating two distinct non-isothermal functions for the matric suctions of capillary and adsorbed water. The disparity in soil water retention curves under drying and wetting branches is illustrated by leveraging the combined effect of contact angle and entrapped air. The comparisons between the predicted and measured results showed that the new model can reasonable predict the retention behaviors of unsaturated soils under different temperature, void ratio, and drying-wetting cycles.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106869"},"PeriodicalIF":5.3,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553510","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

Remote hydraulic fracturing at weak interfaces 弱界面远程水力压裂

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-10-30 DOI: 10.1016/j.compgeo.2024.106830

Tao You , Keita Yoshioka

引用次数: 0