Computers and Geotechnics最新文献_第5页

Numerical investigation on the landslide dam formation in landslide-river interaction

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2025-01-29 DOI: 10.1016/j.compgeo.2025.107118

H.Y. Luo , P. Shen , L.M. Zhang , J. He

{"title":"Numerical investigation on the landslide dam formation in landslide-river interaction","authors":"H.Y. Luo , P. Shen , L.M. Zhang , J. He","doi":"10.1016/j.compgeo.2025.107118","DOIUrl":"10.1016/j.compgeo.2025.107118","url":null,"abstract":"<div><div>Landslides occur in valleys always interact with the rivers. The sliding materials are likely to deposit in the river and form a landslide dam that impedes the river water flow, threatening human lives and properties both upstream and downstream. It is thus essential to investigate the formation mechanisms of landslide dams during landslide-river interaction. In this study, a multi-phase depth-averaged model is adopted to systematically explore the key factors that influence landslide dam formation, including the landslide volume, river discharge, landslide discharge, initial solid concentration and internal friction angle of landslide material. It is found that the landslide volume is always the key on landslide dam formation. The river water plays a critical role on retarding the inertia dynamic of landslide and accelerating the deposition process. One interesting finding is that the river blockage condition is insensitive to both the river and landslide discharge rates while the river flow depth is a more direct factor that controls river blockage. The two material properties on landslide dam formation (i.e., the initial solid concentration and internal friction angle) are represented by the enhanced flow mobility. After a landslide dam forms, the lasting impact of river water leads to the evolution of landslide deposit in the river. The kinetic energy ratio of landslide deposit to river water is linearly correlated with the solid concentration of deposit. The in-depth study on landslide formation mechanisms provides a solid basis for the evaluation of landslide hazard chain and risk mitigation.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"180 ","pages":"Article 107118"},"PeriodicalIF":5.3,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104972","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

Undrained cyclic and post-cyclic shear behaviour of sand with varying liquefaction degrees: insights from DEM

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2025-01-29 DOI: 10.1016/j.compgeo.2025.107116

Zhiyong Liu , Xinran Chen , Bo Liu , Jianfeng Xue

{"title":"Undrained cyclic and post-cyclic shear behaviour of sand with varying liquefaction degrees: insights from DEM","authors":"Zhiyong Liu , Xinran Chen , Bo Liu , Jianfeng Xue","doi":"10.1016/j.compgeo.2025.107116","DOIUrl":"10.1016/j.compgeo.2025.107116","url":null,"abstract":"<div><div>The stability of geotechnical structures after an earthquake is primarily determined by the residual strength of surrounding soils that have not fully liquefied. This research employs the discrete element method (DEM) to study the undrained post-cyclic shear behaviour of sand under triaxial conditions, focusing on the effect of varying degrees of liquefaction (LD) simulated by subjecting the samples to different lengths of cyclic loading. Different types of cyclic loading, i.e. symmetric (fully reversal), partially reversal, and non-reversal ones, as well as the effect of sample density, have been considered. The results indicate that the samples under fully or partially reversal cyclic loading eventually liquefied, displaying a cyclic mobility failure mode. In contrast, samples under non-reversal cyclic loading develop plastic strain accumulation (PSA) failure without liquefaction. The post-cyclic shear stiffness of the samples is affected by both LD and the type of cyclic loading. For samples under reversal cyclic loading, the post-cyclic shear stiffness decreases as LD increases. Notably, the liquefied samples (LD = 1) initially exhibit near-zero stiffness during post-liquefaction shear until highly anisotropic force chains are formed along the loading direction, with their buckling leading to stiffness recovery. The length of the low-stiffness stage is influenced by the static shear stress and the relative density of the sample, which determines the rate of anisotropy accumulation during cyclic loading. The onset and completion of stiffness recovery are marked by a peak in anisotropy and an abrupt increase in effective anisotropy, respectively. For samples under non-reversal cyclic loading, the post-cyclic shear stiffness initially decreases with the increase in LD but increases at higher LDs due to the significant anisotropy developed during the cyclic loading stage.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"180 ","pages":"Article 107116"},"PeriodicalIF":5.3,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172644","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 novel depth-averaged model of landslide over erodible bed using (b, s) coordinates

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2025-01-28 DOI: 10.1016/j.compgeo.2025.107105

Van Khoi Pham , Changhoon Lee , Van Nghi Vu

引用次数: 0

An improved CFD-DEM coupling method for simulating the steady seepage-induced behaviors of soil-rock mixture slopes

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2025-01-27 DOI: 10.1016/j.compgeo.2025.107069

Lei Xing , Wenping Gong , Jinsong Huang , Hongbo Zhang , Baoyin Xing , Lei Wang

{"title":"An improved CFD-DEM coupling method for simulating the steady seepage-induced behaviors of soil-rock mixture slopes","authors":"Lei Xing , Wenping Gong , Jinsong Huang , Hongbo Zhang , Baoyin Xing , Lei Wang","doi":"10.1016/j.compgeo.2025.107069","DOIUrl":"10.1016/j.compgeo.2025.107069","url":null,"abstract":"<div><div>Modeling the seepage-induced progressive failure of soil-rock mixture (SRM) slopes is challenging because of the large deformation and the complexity of stress-seepage coupling. To address these challenges, this study presents a numerical approach for modeling the seepage-induced progressive failure of SRM slopes, where rock blocks within slopes and the effect of cracks on seepage behavior during slope failure are explicitly considered and modeled. Within the proposed method, the traditional unresolved computational fluid dynamics-discrete element method (CFD-DEM) coupling method is first improved by introducing the unstructured mesh and hydraulic boundary condition to model the seepage-induced progressive failure of SRM slopes. The seepage behavior within SRM slopes is modeled with a CFD solver based on finite volume methods, while the particle motion under these interaction forces is simulated with a DEM solver. Note that fluid-particle interaction forces are calculated with empirical equations in the improved CFD-DEM coupling method. CFD-DEM coupling is achieved by exchanging data between the two solvers at each timestep. The proposed numerical method’s effectiveness is illustrated through two seepage problems (within an SRM sample and an SRM slope) and three model tests with different rock contents (in terms of 10%, 20%, and 30%).</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"180 ","pages":"Article 107069"},"PeriodicalIF":5.3,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104973","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 novel surrogate model for hydro-mechanical coupling in unsaturated soil with incomplete physical constraints

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2025-01-27 DOI: 10.1016/j.compgeo.2025.107091

Charles W.W. Ng, Qianyu Zhou, Qi Zhang

{"title":"A novel surrogate model for hydro-mechanical coupling in unsaturated soil with incomplete physical constraints","authors":"Charles W.W. Ng, Qianyu Zhou, Qi Zhang","doi":"10.1016/j.compgeo.2025.107091","DOIUrl":"10.1016/j.compgeo.2025.107091","url":null,"abstract":"<div><div>Physics-informed neural networks (PINNs) are increasingly employed for surrogate modelling of soil behaviour. Existing surrogate models for unsaturated soil only account for seepage in rigid soil, neglecting the complex coupling between deformation and seepage in unsaturated soil. This study develops a new surrogate model for hydro-mechanical coupling in unsaturated soil using the PINN approach. Dimensionless governing equations, including mass balance and force balance equations, are derived and adopted for physical constraints. With absence of explicit constitutive relations, this new surrogate model utilises sparse measured data to identify pore water pressure, effective stress and deformation in unsaturated soil. Separate neural networks are employed to facilitate efficient back-propagation for coupled problem involving multiple outputs. The newly developed model is then applied to simulate two cases with sparse measurements in unsaturated soil. The results illustrate that the newly developed surrogate model successfully learns the elasto-plastic constitutive relation of suction-induced volume change from experimental data. Meanwhile, model predictions regarding both water flow and stress distribution align within the 95 % confidence interval of theoretical values, demonstrating interpretability of PINN model. Furthermore, by adhering to physical constraints, the relative error in predicting soil deformation from neural networks significantly reduces from 49 % to less than 10 %. These findings suggest PINN model with separate networks is capable to simulate unsaturated soil considering both deformation and seepage, even with sparse measured data and incomplete physical constraints.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"180 ","pages":"Article 107091"},"PeriodicalIF":5.3,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172647","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 investigation of fracture competitive propagation mechanisms for temporary plugging staged fracturing (TPSF) in shale gas reservoirs

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2025-01-27 DOI: 10.1016/j.compgeo.2025.107109

Jianxiong Li , Zhanyuan Zhu , Wen Hua , Yi Yang , Shiming Dong , Tiankui Guo

{"title":"Numerical investigation of fracture competitive propagation mechanisms for temporary plugging staged fracturing (TPSF) in shale gas reservoirs","authors":"Jianxiong Li , Zhanyuan Zhu , Wen Hua , Yi Yang , Shiming Dong , Tiankui Guo","doi":"10.1016/j.compgeo.2025.107109","DOIUrl":"10.1016/j.compgeo.2025.107109","url":null,"abstract":"<div><div>Temporary plugging staged fracturing (TPSF) is a technique rapidly growing for enhancing the uniform growth of multiple fractures in shale gas reservoirs. However, the mechanisms of fracture competition during TPSF remain incompletely understood, primarily due to pre-existing natural fractures and stress interference. This study presents a fully coupled Finite Element Method (FEM) model incorporating the pore pressure cohesive zone method to investigate how fractures compete for growth in TPSF. Moreover, a user-defined perforation element connected to a discrete fracture network model is employed to analyze how fluid flow is partitioned. The results indicate that denser natural fractures (NFs) create more connections for hydraulic fractures (HFs), thereby increasing the complexity of the fracture network. Reduction in cluster spacing can result in distorted fracture morphologies and altered propagation pathways, potentially halting fracture growth. Higher injection rates elevate injection pressure, which may inhibit fracture growth but could aid in penetrating stress interference zones to generate asymmetrical fractures. Fractures tend to propagate towards larger inclination angles, with an inclination angle close to 45° being optimal for enhancing fracture growth and reservoir stimulation. This study offers valuable insights into the competitive propagation mechanism of fractures and provides guidance on optimal field design for TPSF.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"180 ","pages":"Article 107109"},"PeriodicalIF":5.3,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172650","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

Stability analysis of rock slopes considering strata uncertainty using dual-source surface wave inversion with borehole constraints

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2025-01-26 DOI: 10.1016/j.compgeo.2025.107068

Yaoying Liang , Ming Peng , Liu Liu , Siang Huat Goh , Dengyi Wang , Jian Shen

{"title":"Stability analysis of rock slopes considering strata uncertainty using dual-source surface wave inversion with borehole constraints","authors":"Yaoying Liang , Ming Peng , Liu Liu , Siang Huat Goh , Dengyi Wang , Jian Shen","doi":"10.1016/j.compgeo.2025.107068","DOIUrl":"10.1016/j.compgeo.2025.107068","url":null,"abstract":"<div><div>The stability of rock slopes is mainly controlled by subsurface characteristics, such as soft layers and broken zones. However, determining their locations and associated uncertainties is challenging due to their concealment and complexity. This study proposes a framework for stability analysis of rock slopes, which accounts for strata uncertainty quantified through dual-source surface wave inversion with borehole constraints. The shear wave velocity profiles of the slope were obtained by combining active surface wave and passive microtremor using multichannel analysis of surface waves (MASW) method and microtremor survey method (MSM), respectively. The prior constraints for the inversion were obtained from borehole television and ultrasonic testing. Subsequently, the inverted depths of the interfaces were represented as continuous distributions and fitted to various models. The stability of the slope was then analyzed by incorporating strata uncertainty. The proposed framework was applied to a steep road-cut rock slope located in Shandong Province, China. The results show that the proposed framework effectively detects soft layers and quantifies uncertainties in interface depths for probabilistic stability analysis. The dual-source surface wave inversion provides both sufficient detection depth and high resolution of shallow strata. Incorporating the prior borehole-derived constraints, the accuracy and speed of the dual-source surface wave inversion have been greatly enhanced. The interface depths can be quantitatively described by normal distributions, which have been selected based on the lowest Akaike Information Criterion (AIC) value. Three soft layers were identified in the presented case, and variations in the thickness of the soft layers influenced the safety factor.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"180 ","pages":"Article 107068"},"PeriodicalIF":5.3,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172649","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

Contact erosion of soil layers with different water table levels under cyclic loading using VOF-DEM coupled method

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2025-01-25 DOI: 10.1016/j.compgeo.2025.107090

Xianfeng Diao , Guoqing Cai , Rui Yang , Xuzhen He

{"title":"Contact erosion of soil layers with different water table levels under cyclic loading using VOF-DEM coupled method","authors":"Xianfeng Diao , Guoqing Cai , Rui Yang , Xuzhen He","doi":"10.1016/j.compgeo.2025.107090","DOIUrl":"10.1016/j.compgeo.2025.107090","url":null,"abstract":"<div><div>In the process of using transportation infrastructure, contact erosion between different particle sizes soil layers can easily occur under complex hydro-mechanical coupling, leading to deformation and damage of structures. To investigate indirect erosion between soil layers under cyclical load effects from a microscopic perspective, a volume of fluid-discrete element method (VOF-DEM) coupled method was adopted in this study. The influence of different water table levels and particle size ratios (PSR) was considered. The study found that: (1) The compressive effect of coarse particles during loading and the stress relaxation effect during unloading can both cause migration of fine particles within one loading–unloading cycle; (2) Immersion of the contact surface between coarse and fine particles is a key factor in inducing particle migration, with the interaction between particles being the most intense at the contact surface; (3) Fully saturated soil experiences the most severe particle erosion and macroscopic deformation; (4) Reducing PSR can effectively improve the integrity of soil structure and suppress erosion of fine particles; (5) Particle migration inevitably leads to axial deformation of the soil, resulting in reduced stiffness and increased energy dissipation during loading–unloading cycles. This study provides new insights into contact erosion under complex hydraulic coupling from a microscopic perspective.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"180 ","pages":"Article 107090"},"PeriodicalIF":5.3,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104974","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 coupled thermo-hygro-mechanical peridynamic model for mechanism analysis of soil desiccation cracking

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2025-01-25 DOI: 10.1016/j.compgeo.2025.107073

Yanhe Qiao , Panyong Liu , Xin Gu , Xiaozhou Xia , Qing Zhang

{"title":"A coupled thermo-hygro-mechanical peridynamic model for mechanism analysis of soil desiccation cracking","authors":"Yanhe Qiao , Panyong Liu , Xin Gu , Xiaozhou Xia , Qing Zhang","doi":"10.1016/j.compgeo.2025.107073","DOIUrl":"10.1016/j.compgeo.2025.107073","url":null,"abstract":"<div><div>Soil desiccation cracking, a natural phenomenon involving the complex interaction of multi-physical fields, significantly weakens the mechanical and hydraulic properties of soil, potentially leading to natural hazards. This study proposes a coupled thermo-hygro-mechanical peridynamic (PD) model to investigate the mechanical responses and fracture behaviors in saturated soils due to moisture evaporation and heat transfer. Specifically, the temperature-dependent moisture diffusion and moisture-dependent heat conduction equations are nonlocally reformulated using peridynamic differential operators (PDDO). The constitutive model incorporates the spatial attenuation of nonlocal interactions and the effects of moisture and temperature in the bond-based peridynamic framework. Utilizing a hybrid explicit–implicit solution strategy, the model can effectively capture soil strip detachment, cracking, and curling. The model is also employed to explore moisture transmission mechanisms, evaluate the effects of temperature and thickness on crack morphology, and reveal the relationship between stress, strain evolution, and crack propagation. Furthermore, the model incorporates the reference evapotranspiration formula, which can account for environmental factors such as solar radiation, ambient temperature, relative humidity, and wind speed. Therefore, this expands the scope of model applicability and enables the simulation of soil desiccation cracking under natural conditions.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"180 ","pages":"Article 107073"},"PeriodicalIF":5.3,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172646","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 algorithm for modeling 2D irregular columnar jointed rock masses

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2025-01-25 DOI: 10.1016/j.compgeo.2025.107093

Zhiyou Wu , Zhanyuan Zhu , Weimin Xiao

{"title":"An algorithm for modeling 2D irregular columnar jointed rock masses","authors":"Zhiyou Wu , Zhanyuan Zhu , Weimin Xiao","doi":"10.1016/j.compgeo.2025.107093","DOIUrl":"10.1016/j.compgeo.2025.107093","url":null,"abstract":"<div><div>Field investigations show that the cross-section of irregular columnar jointed rock mass (ICJRM) is composed of a variety of polygon mosaics where pentagons and hexagons account for the majority. A VSRD (Voronoi-based Seed Random Displacement) algorithm that can precisely control the proportions of pentagons and hexagons is proposed to model the cross section of ICJRMs. The algorithm consists of generating an initial seed set to produce a Voronoi diagram with special pentagon tessellation, transforming special pentagons into hexagons and other polygons through moving some initial seeds by a random displacement, and correcting the average equivalent diameter of the columns. Then the VSRD algorithm is employed to model five famous ICJRMs, and the geometric properties of the models are compared with field investigations of these ICJRMs. The results show that the proportions of pentagon and hexagon in the models are consistent with field investigations, and the consistency of the average equivalent diameter of the columns between models and natural ICJRMs can be achieved by introducing a correction factor, by which the reliability of VSRD algorithm is verified. Additionally, the 2D ICJRM models generated by VSRD algorithm can provide a new perspective for exploring the mechanical and hydraulic properties of ICJRMs through physical and numerical experiments.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"180 ","pages":"Article 107093"},"PeriodicalIF":5.3,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171745","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