Computers and Geotechnics最新文献_第10页

Large deformation modelling of a plate anchor in marine clay based on micropolar continuum theory

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-12-27 DOI: 10.1016/j.compgeo.2024.107014

Aindra Lingden , Xue Zhang , Yujia Zhang , Yutang Ding

{"title":"Large deformation modelling of a plate anchor in marine clay based on micropolar continuum theory","authors":"Aindra Lingden , Xue Zhang , Yujia Zhang , Yutang Ding","doi":"10.1016/j.compgeo.2024.107014","DOIUrl":"10.1016/j.compgeo.2024.107014","url":null,"abstract":"<div><div>Modelling anchor movement in marine clay presents significant challenges. Marine clay typically exhibits strain-softening behaviour, complicating traditional continuum models due to mesh dependency issues. Additionally, the clay surrounding an anchor undergoes significant geometric changes, leading to mesh distortion when using conventional finite element methods. To address these challenges, this paper introduces a mesh-independent micropolar finite element formulation integrated with the Remeshing and Interpolation Technique with Small Strain (RITSS) to investigate marine clay responses during anchor movement. The micropolar theory mitigates mesh dependency, while RITSS facilitates large deformation analysis. This study emphasises the selection of the internal length scale (<span><math><msub><mi>l</mi><mi>c</mi></msub></math></span>) value to balance computational accuracy and efficiency and examines the influence of anchor embedment depth and clay strain-softening characteristics on failure modes and load–displacement responses. Notably, the findings demonstrate a linear relationship between the residual resistance force and the clay brittleness index. The results from this mesh-independent simulation offer valuable insights into the behaviour of marine clay under anchor loading conditions.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"179 ","pages":"Article 107014"},"PeriodicalIF":5.3,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145179","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

Study on the Load Transfer and Damage Evolution Characteristics of the Bolt-Grout Interface concerning Bolt Rib Parameters: Based on a Finite-Discrete Numerical Method

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-12-27 DOI: 10.1016/j.compgeo.2024.107010

Sunhao Zhang , Hengjie Luan , Yujing Jiang , Yahua Wang , Bo Li , Ziyi Liu , Tianqi Jiang , Xinpeng Li

{"title":"Study on the Load Transfer and Damage Evolution Characteristics of the Bolt-Grout Interface concerning Bolt Rib Parameters: Based on a Finite-Discrete Numerical Method","authors":"Sunhao Zhang , Hengjie Luan , Yujing Jiang , Yahua Wang , Bo Li , Ziyi Liu , Tianqi Jiang , Xinpeng Li","doi":"10.1016/j.compgeo.2024.107010","DOIUrl":"10.1016/j.compgeo.2024.107010","url":null,"abstract":"<div><div>Revealing the load transfer and failure mechanisms of the bolt-grout interface is crucial for the stability control design of rock mass engineering. Based on laboratory experiments, this study employs a FLAC-PFC coupling numerical simulation method to conduct shear numerical simulations under different normal stress, rib angle, and rib spacing conditions. The study investigates the impact of rib parameters on the load transfer and microscopic damage evolution of the bolt-grout interface. The results show that: When the rib angle is below 45°, the grout tends to climb along the ribs. As the rib angle increases, the normal stress <em>F</em><sub>n</sub> between the grout and ribs gradually increases, leading the grout to adopt a sheared-crush failure mode. When the rib spacing is less than 12 mm, the grout tends to undergo an overall sheared-off failure mode. When the rib spacing is greater than 20 mm, the grout consistently undergoes a sheared-crush failure mode. As the rib spacing increases, the number of ribs gradually decreases, resulting in more intense interactions between each rib and the grout, and a larger damage area around the ribs. With the increase in normal stress, the interactions between the ribs and the grout become more intense, generating more cracks.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"179 ","pages":"Article 107010"},"PeriodicalIF":5.3,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145177","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

SANISAND-CH: A high-pressure bounding surface model for cemented sand, including methane hydrate-bearing sediments

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-12-27 DOI: 10.1016/j.compgeo.2024.106986

An Zhang , Yannis F. Dafalias , Dong Wang

{"title":"SANISAND-CH: A high-pressure bounding surface model for cemented sand, including methane hydrate-bearing sediments","authors":"An Zhang , Yannis F. Dafalias , Dong Wang","doi":"10.1016/j.compgeo.2024.106986","DOIUrl":"10.1016/j.compgeo.2024.106986","url":null,"abstract":"<div><div>This paper introduces a new constitutive model capable of predicting both the shear and compressive stress response of common cemented sand and methane hydrate-bearing sediments (MHBS) under high pressures. This model extends the SANISAND-H model, which is designed for the high-pressure response of clean sand, and incorporates specific constitutive elements from the SANISAND-C model, tailored for cemented sand under normal stress levels. It refines the narrow, closed conical yield surface of the SANISAND-H model by incorporating a bonding strength variable that diminishes with plastic strains. Furthermore, it modifies the critical state lines, reference compression curve, elastic parameters, state parameter, flow rule, and hardening law of SANISAND-H model to account for the cementing and densifying effects of cementitious materials. To capture the effects of temperature, pore pressure, and salinity on the behavior of MHBS, the model includes a condition parameter, influencing the critical state and bonding strength. Validation through laboratory tests confirms the model’s accuracy in simulating the enhanced shear strength, dilatancy, and softening behavior, as well as the reduced compressibility of cemented sand. Moreover, it accurately captures the mechanical responses induced by particle crushing under high pressures.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"179 ","pages":"Article 106986"},"PeriodicalIF":5.3,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145180","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 analysis of cyclic behaviors of clayey sand based on energy method

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-12-27 DOI: 10.1016/j.compgeo.2024.107012

Yi Shan , Taijin Chen , Zhonghong Qiu , Jie Yuan , Xiaobin Ding , Jie Cui

{"title":"DEM analysis of cyclic behaviors of clayey sand based on energy method","authors":"Yi Shan , Taijin Chen , Zhonghong Qiu , Jie Yuan , Xiaobin Ding , Jie Cui","doi":"10.1016/j.compgeo.2024.107012","DOIUrl":"10.1016/j.compgeo.2024.107012","url":null,"abstract":"<div><div>Evaluating cyclic liquefaction of soil from the perspective of energy dissipation provides a more comprehensive insight into its liquefaction mechanism. This study conducted a series of undrained cyclic triaxial tests using discrete element method to investigate the influence of plastic fines content (FC) on the dynamic characteristics of sand-clay mixtures. A new evaluation index, the Viscous Energy Dissipation Ratio (<em>VEDR</em>), is introduced to assess the energy dissipation performance of sand-clay mixtures. Macroscopically, it is shown that when FC < 30 %, increasing the fines content promotes the development of strain and pore water pressure, leading to a decrease in dynamic strength. However, when FC > 30 %, the trend reverses. In terms of energy dissipation, as the fines content increases, <em>VEDR</em> gradually transitions from the sand-like to the clay-like mode, exhibiting a unique transitional mode when FC = 50 %. Microscopically, the development of bond breakage is highly similar to that of <em>VEDR</em>. The bond breakage facilitates particle sliding and rolling, which is the fundamental factor causing the differences of energy dissipation between pure sand and sand-clay mixtures. This paper contributes to the mechanistic study of liquefaction criteria based on energy theory by establishing the connection between microscopic particle behavior and macroscopic energy dissipation during the cyclic liquefaction process.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"179 ","pages":"Article 107012"},"PeriodicalIF":5.3,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145184","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

Gravel Particle Shape Classification from Half-Particle Point Clouds using a Dynamic Graph Edge Convolution Neural Network

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-12-27 DOI: 10.1016/j.compgeo.2024.107015

Junbo Xi , Lin Gao , Junxing Zheng , Dong Wang , Gezhou Wang , Zhenchang Guan , Jiajia Zheng

{"title":"Gravel Particle Shape Classification from Half-Particle Point Clouds using a Dynamic Graph Edge Convolution Neural Network","authors":"Junbo Xi , Lin Gao , Junxing Zheng , Dong Wang , Gezhou Wang , Zhenchang Guan , Jiajia Zheng","doi":"10.1016/j.compgeo.2024.107015","DOIUrl":"10.1016/j.compgeo.2024.107015","url":null,"abstract":"<div><div>Obtaining the three-dimensional (3D) shape of gravel particles is essential for calculating their roundness and sphericity. However, cost-effective, and rapid non-penetrating 3D imaging technologies, such as 3D laser scanners, stereophotography, and structured light techniques, only capture the geometric shape of the upper half particles (2.5D particles), unable to penetrate a particle to acquire the shape of the lower half. Current algorithms cannot accurately classify real 3D particles using easily available and low-cost 2.5D particles. To address this issue, this study aims to develop a dynamic graph edge convolution neural network (DGECNN) based on deep learning, utilizing 2.5D point clouds to characterize and classify the roundness and sphericity of 3D particles. The dataset comprises 4200 2.5D point clouds labeled into 12 roundness-sphericity categories based on corresponding complete 3D particle characterizations. Experimental results demonstrate that with a sampling point of 1200 and a batch size of 64, the training time is relatively shorter, and the automatic classification accuracy reaches a peak of 90.76%. Finally, compared to the traditional 3D CG method, the DGECNN classification is equally applicable to sand-size particles and exhibits significant advantages in roundness-sphericity, volume, surface area, and convex hull volume.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"179 ","pages":"Article 107015"},"PeriodicalIF":5.3,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143144985","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

Modelling root decomposition effects on root reinforcement and slope stability

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-12-27 DOI: 10.1016/j.compgeo.2024.107024

Trung Nghia Phan , Anthony Kwan Leung , Thanh Son Nguyen , Viroon Kamchoom , Suched Likitlersuang

{"title":"Modelling root decomposition effects on root reinforcement and slope stability","authors":"Trung Nghia Phan , Anthony Kwan Leung , Thanh Son Nguyen , Viroon Kamchoom , Suched Likitlersuang","doi":"10.1016/j.compgeo.2024.107024","DOIUrl":"10.1016/j.compgeo.2024.107024","url":null,"abstract":"<div><div>This study investigates the influences of root decomposition of two vetiver species on mechanical root shear reinforcement and vegetated slope stability. The transient variations of maximum root shear reinforcement (<span><math><mrow><msub><mi>C</mi><mrow><mi>r</mi><mo>,</mo><mi>max</mi></mrow></msub></mrow></math></span>) of vetiver species was examined by combining the extended Root Bundle Model with the modified Wu’s model. Existing laboratory data of the biomechanical properties (i.e., tensile strength, secant modulus) and morphological traits (i.e., diameter distribution, root length, orientation) of the decomposing roots following herbicide application were used as input parameters in the root reinforcement models to predict the root shear reinforcement. The predicted <span><math><mrow><msub><mi>C</mi><mrow><mi>r</mi><mo>,</mo><mi>max</mi></mrow></msub></mrow></math></span> was then used in the slope stability analysis on the basis of Morgenstern-Price method to evaluate the temporal variation in the stability of vegetated slope with different slope angles and plant killing patterns. The combined model was capable of predicting the exponential reductions in <span><math><mrow><msub><mi>C</mi><mrow><mi>r</mi><mo>,</mo><mi>max</mi></mrow></msub></mrow></math></span> following the transient declines in the root strength, secant modulus and diameter. The large variability in the tensile strength of decomposing roots could also be well captured through the use of Weibull survival function. The slope stability analysis highlighted that the vetiver roots contributed the most to the stability of slope when the slope angle was less than 45°. Additionally, it is recommended to refrain from killing the plants grown near the slope’s toe, because this region is particularly susceptible to shallow slope failure.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"179 ","pages":"Article 107024"},"PeriodicalIF":5.3,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145183","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

Corrigendum to “Discrete and continuum modelling of rock-ice avalanches: vertical segregation and its feedback on flow mobility” [Comput. Geotech. 175 (2024) 106691]

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-12-27 DOI: 10.1016/j.compgeo.2024.107032

Kahlil F.E. Cui , Gordon G.D. Zhou , Lu Jing

引用次数: 0

Application of a thermo-mechanical-damage coupling model based on the TLF-SPH in the thermal cracking simulation of brittle solids

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-12-26 DOI: 10.1016/j.compgeo.2024.107017

Dianrui Mu , Ke Zhang , Kesheng Jin , Shuai Zhao , Xiao Wang

{"title":"Application of a thermo-mechanical-damage coupling model based on the TLF-SPH in the thermal cracking simulation of brittle solids","authors":"Dianrui Mu , Ke Zhang , Kesheng Jin , Shuai Zhao , Xiao Wang","doi":"10.1016/j.compgeo.2024.107017","DOIUrl":"10.1016/j.compgeo.2024.107017","url":null,"abstract":"<div><div>An accurate, stable and efficient thermo-mechanical-damage coupling model based on the TLF-SPH (TMD-TLF-SPH) is developed to simulate the thermal cracking of brittle solid materials. In the present work, directly adjacent particles interact with each other and transfer heat flux and interaction force through virtual links. To simulate the propagation of thermal cracks and the discontinuous evolution characteristics of temperature, a parameter <em>f<sub>k</sub></em> that characterizes the damage level of virtual links is used to modify the kernel function. The force state parameter <em>f<sub>k</sub></em> is determined by the maximum tensile strain criterion. In addition, the kernel gradient is continuously corrected to avoid kernel approximation inconsistency caused by kernel truncation during the thermal crack propagation. Firstly, two steady-state heat conduction examples for thick-walled cylinders are used to verify the accuracy and robustness of the present model. Then, the thermal cracking modes and temperature evolution characteristics of ceramic or rock samples subjected to cold shock under different initial temperatures and thermal convection coefficients are studied, respectively. The results indicate that the present method can effectively reveal the thermal cracking mechanism of brittle materials under cold shock, providing important theoretical guidance for extending the service life of thermal structures in cold shock environments.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"179 ","pages":"Article 107017"},"PeriodicalIF":5.3,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145190","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 3D train-track-tunnel-soil coupled dynamics model based on semi-analytical cylindrical layer element

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-12-26 DOI: 10.1016/j.compgeo.2024.106966

Jianjin Yang , Shengyang Zhu , Lei Xu , Georges Kouroussis , Qiuyi Li , Wanming Zhai

引用次数: 0

A physics-data-driven method for predicting surface and building settlement induced by tunnel construction

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-12-25 DOI: 10.1016/j.compgeo.2024.107020

You Wang, Qianjun Fan, Fang Dai, Rui Wang, Bosong Ding

{"title":"A physics-data-driven method for predicting surface and building settlement induced by tunnel construction","authors":"You Wang, Qianjun Fan, Fang Dai, Rui Wang, Bosong Ding","doi":"10.1016/j.compgeo.2024.107020","DOIUrl":"10.1016/j.compgeo.2024.107020","url":null,"abstract":"<div><div>Surface and surrounding building settlement is frequently caused by soil disturbance during subway tunnel construction, significantly impacting construction safety and structural stability. Traditional machine learning models have shown some effectiveness in settlement prediction but often fail to capture the underlying physical mechanisms. This study proposed a novel physics-informed optimized extreme learning machine (PIOELM) to enhance prediction accuracy and physical interpretability. Based on the extreme learning machine (ELM), the model integrated the chaos adaptive sparrow search algorithm (CASSA) for parameter optimization and incorporated the Pasternak foundation model using automatic differentiation. The model’s accuracy was validated using precise engineering data and compared against the physics-informed neural network (PINN), physics-informed extreme learning machine (PIELM), and traditional data-driven models. The results show that the PIOELM model outperforms others in handling extreme values and maintains high accuracy across various scales of data prediction. Prediction accuracy improved by up to 85.29%, with a minimum improvement of 30.68%, demonstrating strong stability and generalization capabilities.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"179 ","pages":"Article 107020"},"PeriodicalIF":5.3,"publicationDate":"2024-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145617","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