Computers and Geotechnics最新文献_第7页

Probabilistic bearing capacity of eccentrically loaded strip footing on spatially random rock mass using correlation-controlled LHS sampling 利用相关控制的 LHS 采样对空间随机岩体上偏心加载条形基脚的承载力进行概率分析

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-11-06 DOI: 10.1016/j.compgeo.2024.106859

Shuvankar Das, Debarghya Chakraborty

{"title":"Probabilistic bearing capacity of eccentrically loaded strip footing on spatially random rock mass using correlation-controlled LHS sampling","authors":"Shuvankar Das, Debarghya Chakraborty","doi":"10.1016/j.compgeo.2024.106859","DOIUrl":"10.1016/j.compgeo.2024.106859","url":null,"abstract":"<div><div>To examine the heterogeneous behavior of spatially random rock mass, the probabilistic bearing capacity of strip footing subjected to eccentric loading is computed in the present study. The lower bound finite element limit analysis in combination with the power conic optimization technique is employed by assuming the rock mass to follow the generalized Hoek-Brown (GHB) failure criterion at collapse. Geological Strength Index (<em>GSI</em>) is modeled as a spatially random variable. The rock mass material constant (<em>m<sub>i</sub></em>) and uniaxial compressive strength ratio (<em>σ<sub>ci/</sub>γB</em>) are modeled as spatially random fields. Correlation-controlled Latin hypercube sampling (LHS) is implemented to create the spatially random discretized rock mass domain. With the help of the Monte Carlo simulation technique, the stochastic responses are determined. The obtained values of bearing capacity factor are found to follow the gamma distribution. The failure probability and mean bearing capacity factor for different ranges of practical cases of rock mass heterogeneity and loading eccentricity conditions are presented in design charts. With the increase in the eccentricity values, the mean bearing capacity factor reduces in all probabilistic cases. The target probability is expressed in terms of the desired factor of safety based on the acquired results for different rock mass and loading parameters.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106859"},"PeriodicalIF":5.3,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593777","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

3D CFD-DEM modeling of sand production and reservoir compaction in gas hydrate-bearing sediments with gravel packing well completion 含天然气水合物沉积物中含砾石填料完井的产砂和储层压实三维 CFD-DEM 模型

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-11-05 DOI: 10.1016/j.compgeo.2024.106870

Xiaofeng Dou , Zhichao Liu , Dianheng Yang , Yingjie Zhao , Yanlong Li , Deli Gao , Fulong Ning

{"title":"3D CFD-DEM modeling of sand production and reservoir compaction in gas hydrate-bearing sediments with gravel packing well completion","authors":"Xiaofeng Dou , Zhichao Liu , Dianheng Yang , Yingjie Zhao , Yanlong Li , Deli Gao , Fulong Ning","doi":"10.1016/j.compgeo.2024.106870","DOIUrl":"10.1016/j.compgeo.2024.106870","url":null,"abstract":"<div><div>Sand production is one of the bottlenecks restricting the safe, efficient, and controllable production of hydrates. Enhancing the understanding of mesoscopic sand production responses is essential for sand production risk management. Yet, existing mesoscopic sand production models inadequately capture the effects of hydrate cementation, resulting in an incomplete assessment of the mechanical impacts of hydrates on sand production. Herein, we developed a new three-dimensional model for sand production in gas hydrate-bearing sediments (GHBSs) with gravel packing well completion, utilizing the coupled computational fluid dynamics and discrete element method (CFD-DEM). The model considers the coupled interactions of mechanical weakening and permeability variation in GHBSs caused by hydrate cementation reduction. Simulations are analyzed to clarify the responses of sand production and reservoir compaction under the coupled mechanical, hydraulic, and sand control completion in GHBSs during depressurization. The high fluid flow rate induced by a high production pressure differential can promote sand production and reservoir compaction. Additionally, the high effective stress and high hydrate dissociation rate induced by a high production pressure differential are beneficial for initial sand production, but they can also prematurely lead to gravel packing layer obstruction, inhibiting the final sand production. This also results in a dual impact on compaction deformation, enhancing it through compaction while decelerating it by inhibiting sand production. This work provides a viable simulation idea and preliminary insights into the mechanism of sand production from GHBSs.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106870"},"PeriodicalIF":5.3,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142587157","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}

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A three-phase two-point MPM for large deformation analysis of unsaturated soils 用于非饱和土壤大变形分析的三相两点 MPM

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-11-05 DOI: 10.1016/j.compgeo.2024.106860

Yosuke Higo , Yudai Takegawa , Fan Zhu , Daichi Uchiyama

引用次数: 0

Prediction of huge earthquake-induced deformation of in-service embankments using crushed mudstone as a soil material with slaking and proposal of countermeasures 使用碾碎泥岩作为土壤材料的在役路堤的巨大地震诱发变形预测与对策建议

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-11-05 DOI: 10.1016/j.compgeo.2024.106855

Shogo Inukai , Takayuki Sakai , Masashi Nagata , Toshihiro Noda , Masaki Nakano

{"title":"Prediction of huge earthquake-induced deformation of in-service embankments using crushed mudstone as a soil material with slaking and proposal of countermeasures","authors":"Shogo Inukai , Takayuki Sakai , Masashi Nagata , Toshihiro Noda , Masaki Nakano","doi":"10.1016/j.compgeo.2024.106855","DOIUrl":"10.1016/j.compgeo.2024.106855","url":null,"abstract":"<div><div>Evaluating the seismic resistance of embankments using crushed mudstone as a geomaterial is an urgent and crucial requirement. In this study, a ground investigation was conducted on the actual embankment. Based on the results, the seismic response of the embankment, simulating progressed slaking, was conducted by elastoplastic finite deformation analysis using two major types of earthquake motion: epicentral and subduction zone earthquakes. Based on the results of the geotechnical investigation, the embankment could be divided into three layers owing to differences in physical properties, and slaking progressed below the groundwater level in the embankment. The embankment did not exhibit large deformation during the epicentral earthquake owing to the short duration. For the subduction zone earthquake, the developed shear strain was from the two large acceleration groups and the subsequent smaller accelerations, resulting in large deformation. Seismic loading caused the gradual loss of the overconsolidation and decay of the structure which reduced the embankment strength. This analysis revealed that shear strain developed at the slope toe and the lower part of the embankment. Furthermore, the analysis after the earthquake was also conducted to examine whether or not countermeasure method is feasible for emergency restoration. The seismic resistance was greatly improved when a combination of ground improvement and replacement/counterweight fill methods were used to reinforce these areas, which is not only during but also after the earthquake. This study can contribute to the understanding of the seismic behavior of soil structures using materials undergoing internal deterioration and to the development of countermeasure methods for such structures.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106855"},"PeriodicalIF":5.3,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142587228","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

Infiltration characteristics of slurries in porous media based on the coupled Lattice-Boltzmann discrete element method 基于格点-玻尔兹曼离散元耦合法的多孔介质中泥浆的渗透特性

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-11-04 DOI: 10.1016/j.compgeo.2024.106865

Xudong Zhang , Tianwen Huang , Zhuan Ge , Teng Man , Herbert E. Huppert

{"title":"Infiltration characteristics of slurries in porous media based on the coupled Lattice-Boltzmann discrete element method","authors":"Xudong Zhang , Tianwen Huang , Zhuan Ge , Teng Man , Herbert E. Huppert","doi":"10.1016/j.compgeo.2024.106865","DOIUrl":"10.1016/j.compgeo.2024.106865","url":null,"abstract":"<div><div>Slurry infiltration clogging commonly occurs in porous media with fine pores. This infiltration leads to changes in the mechanical properties of the matrix, causing challenges such as material drainage difficulties and uneven force distributions. To investigate the clogging behavior of slurries under various pressure conditions, this study employs a simulation approach with corresponding theoretical analyses. Specifically, it utilizes the discrete element method (DEM) in conjunction with the lattice-Boltzmann method (LBM) to simulate the microscopic infiltration test of slurries in porous media. The findings reveal that fine soil particles exhibit greater mobility compared to their larger counterparts. Furthermore, statistical analysis demonstrates that the degree of pore-clogging is not always positively correlated with pressure. Higher pressures can also lead to the unclogging of the pore space. These observations indicate that particle sizes and pressure conditions are key factors influencing the potential for particle clogging. Based on the analysis, a clogging mechanism is proposed to elucidate the dynamics of particles in porous media. This study provides insights into clogging formation within porous media, leading to a better understanding of both slurry filtration in geotechnical engineering and hyporheic exchange phenomena in stream bed ecosystems.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106865"},"PeriodicalIF":5.3,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578983","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 adversarial multi-source transfer learning method for the stability analysis of methane hydrate-bearing sediments 用于含甲烷水合物沉积物稳定性分析的对抗性多源转移学习方法

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-11-03 DOI: 10.1016/j.compgeo.2024.106868

Wenhao Li , Guotao Ma , Mingjing Jiang , Mohammad Rezania , Haitao Zhu

{"title":"An adversarial multi-source transfer learning method for the stability analysis of methane hydrate-bearing sediments","authors":"Wenhao Li , Guotao Ma , Mingjing Jiang , Mohammad Rezania , Haitao Zhu","doi":"10.1016/j.compgeo.2024.106868","DOIUrl":"10.1016/j.compgeo.2024.106868","url":null,"abstract":"<div><div>This study presents an innovative adversarial multi-source transfer learning approach to enhance submarine hydrate slope stability predictions in the face of small and varied datasets. Integrating terrestrial and submarine data, our method significantly improves knowledge transfer and model generalization. Utilizing hydrate triaxial tests and pore pressure models, we construct a comprehensive dataset that bridges the gap between diverse geological environments. Employing the novel Walrus Optimizer and adversarial training techniques, the model substantially outperforms traditional regression methods. It achieves a correlation coefficient of 0.9936 and a mean absolute error of 0.094, indicating high predictive accuracy and robust handling of data anomalies and distribution inconsistencies. These advancements provide crucial insights into slope stability factors and offer potential enhancements for geological hazard monitoring and early warning systems. Our research demonstrates a substantial improvement in slope stability analysis and opens new avenues for intelligent geological hazard assessments in environments characterized by data scarcity.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106868"},"PeriodicalIF":5.3,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572492","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

Microscopic investigation of shape effect on local scour around the monopile using CFD-DEM 利用 CFD-DEM 对单桩周围局部冲刷的形状效应进行微观研究

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-11-03 DOI: 10.1016/j.compgeo.2024.106872

Dong Li , Ziying Zheng , Zheng Hu , Huihuan Ma

{"title":"Microscopic investigation of shape effect on local scour around the monopile using CFD-DEM","authors":"Dong Li , Ziying Zheng , Zheng Hu , Huihuan Ma","doi":"10.1016/j.compgeo.2024.106872","DOIUrl":"10.1016/j.compgeo.2024.106872","url":null,"abstract":"<div><div>Local scour refers to the erosion or migration of sedimental particles around bridge piers or abutments under the action of water flow. It can potentially undermine the hydraulic structures, resulting in catastrophic damage or even collapse. Under various hydraulic conditions, monopiles with diverse cross-sectional shapes have increasingly been applied to marine foundations. This study aims to investigate the effect of monopile shapes on scour development, and to establish a cross-scale connection between the macroscopic evolution of scour pits and the microscopic characteristics of sediments. The scour processes around monopiles are simulated using a coupled computational fluid dynamics and discrete element method (CFD-DEM). Four monopile shapes are examined, including circular, square, square with rounded corners, and diamond. Macroscopic characteristics such as seabed morphology, maximum scouring depth, and scour areas are analyzed, along with the microscopic characteristics such as the kinetic energy, drag force, and mechanical coordination number. The outcomes highlight that the diamond-shaped pile results in the greatest scour depth and widest scour areas compared to the other shapes. The incorporation of rounded pile corners improves flow characteristics and mitigate scour pit development. Furthermore, the local scour at different areas around the monopiles varies under the influence of different flow features.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106872"},"PeriodicalIF":5.3,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572493","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

MatGBM: A Computer Vision-Aided Triangular Mesh Generator for High-Fidelity Grain-Based Model MatGBM：用于高保真纹理模型的计算机视觉辅助三角网格生成器

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-11-02 DOI: 10.1016/j.compgeo.2024.106871

Louis Ngai Yuen Wong, Zihan Liu

{"title":"MatGBM: A Computer Vision-Aided Triangular Mesh Generator for High-Fidelity Grain-Based Model","authors":"Louis Ngai Yuen Wong, Zihan Liu","doi":"10.1016/j.compgeo.2024.106871","DOIUrl":"10.1016/j.compgeo.2024.106871","url":null,"abstract":"<div><div>The grain-based model (GBM) stands as a renowned model for polycrystalline simulations in computational mechanics. Despite its popularity, there remains a critical need for a more advanced and user-friendly tool to generate high-fidelity microstructures with specified grain size distributions. Addressing this need, this paper introduces ’MatGBM’, an innovative modeling tool that aspires to enhance numerical simulations of polycrystalline materials. MatGBM seamlessly integrates three modules: a computer vision-aided mineral grain distribution detection, Voronoi tessellation processing, and triangular mesh generation. To accurately capture the two-dimensional structural characteristics of polycrystalline materials, the mineral grain distribution detection module employs computer vision functions to pinpoint particle coordinates and areas. The weighted Voronoi tessellation is generated and processed based on the original grain distribution features, resembling the original image of the polycrystalline material more closely than basic Voronoi tessellation. Finally, MatGBM directly outputs triangular mesh using two optional meshing tools based on the Voronoi polygons. Our rigorous testing via uniaxial compressive tests, Brazilian splitting tests, and three-point bending tests in crystalline rocks and metals, using the combined finite-discrete element method, validates that MatGBM can reliably reproduce the key deformation, damage, and failure characteristics of polycrystalline materials. Overall, MatGBM emerges not only as a promising tool for numerical simulations of rock, metallurgic, and ceramic materials, but also as a potent pre-processing tool for multiple numerical methods.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106871"},"PeriodicalIF":5.3,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572490","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

Three-dimensional dynamic responses of a layered transversely isotropic half-space with irregular interfaces using the thin layer method 使用薄层法测量具有不规则界面的分层横向各向同性半空间的三维动态响应

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-11-02 DOI: 10.1016/j.compgeo.2024.106851

Chao He , Xiaoxin Li , Shunhua Zhou , Hui Li , Xiaoqing Dong

{"title":"Three-dimensional dynamic responses of a layered transversely isotropic half-space with irregular interfaces using the thin layer method","authors":"Chao He , Xiaoxin Li , Shunhua Zhou , Hui Li , Xiaoqing Dong","doi":"10.1016/j.compgeo.2024.106851","DOIUrl":"10.1016/j.compgeo.2024.106851","url":null,"abstract":"<div><div>This paper proposes a thin layer method (TLM) for computing 3D dynamic responses in a layered transversely isotropic (TI) half-space with irregular interfaces. Utilizing Fourier transforms and modal superposition, stiffness matrices for semi-infinite and finite-length thin layer elements are derived, enabling the simulation of wave propagation in the finite-depth domain with irregular interfaces. The complex frequency shifted perfectly matched layer (CFSPML) within the TLM framework is developed to simulate wave attenuation in the underlying TI half-space, addressing the instability issues of the classical PML in the TI medium. The finite-length thin layer element can be of arbitrary length and is independent of the frequency, thus enhancing computational efficiency compared to discrete numerical methods like the FEM. The accuracy of the proposed method is verified with existing methodologies. The dynamic responses of a two-layered TI half-space with a Gaussian-shaped interface induced by either surface or buried dynamic point loads are investigated. The influences of the position and size of the irregular interface, as well as the transversely isotropy, are analyzed. Numerical results demonstrate that the presence of the irregular interface significantly changes the distribution of displacement fields. The influence of the irregular interface is highly dependent on the loading frequency and observation position.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106851"},"PeriodicalIF":5.3,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572491","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

The combined effect of particle angularity and inter-particle friction on micro- and macroscopic properties of granular assemblies 颗粒角度和颗粒间摩擦对颗粒集合体微观和宏观特性的综合影响

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-10-31 DOI: 10.1016/j.compgeo.2024.106850

Dominik Krengel , Haoran Jiang , Jian Chen , Takashi Matsushima

{"title":"The combined effect of particle angularity and inter-particle friction on micro- and macroscopic properties of granular assemblies","authors":"Dominik Krengel , Haoran Jiang , Jian Chen , Takashi Matsushima","doi":"10.1016/j.compgeo.2024.106850","DOIUrl":"10.1016/j.compgeo.2024.106850","url":null,"abstract":"<div><div>Both inter-particle friction and particle shape are known to influence the micro- and macroscopic properties of granular assemblies individually. However their combined influence is still poorly understood. In this work we perform a series of Discrete Element Simulations to systematically study the combined effect of particle angularity and friction on the shear resistance of granular aggregates. We find that for angular particles the residual shear resistance as a function of inter-particle friction shows a local maximum, while for round particles it increases monotonically until it saturates. In contrast, no such effect is observed in the packing structure of the aggregates. The non-monotonic behaviour of angular particles is mirrored by the critical state directional and normal force fabric anisotropies, while the tangential normal force anisotropy shows more similarity to the bulk porosity and the mobilization of friction at the individual particle contacts. Our results now provide a much clearer picture on the origin of the non-monotonic behaviour of the critical state shear resistance on the inter-particle friction, as a competition between sliding and rolling in two different rolling regimes.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106850"},"PeriodicalIF":5.3,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553512","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