Micromechanical analysis of particle corner effect on bearing and deformation behaviors of coral sand slope foundation under a strip footing  

基于颗粒棱角效应的条形基础下珊瑚砂斜坡地基承载与变形行为微观分析

作　　者：PENG Yu LUO Zhao-gang HE Shao-heng QU Li-ming DING Xuan-ming 彭宇;骆赵刚;何绍衡;瞿立明;丁选明

机构地区：[1]Key Laboratory of New Technology for Construction of Cities in Mountain Area,Chongqing University,College of Civil Engineering,Chongqing 400045,China [2]Department of Civil and Environmental Engineering,the Hong Kong Polytechnic University,Hung Hom,Kowloon,Hong Kong,China [3]Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 610031,China

出　　处：《Journal of Central South University》2025年第2期624-642,共19页中南大学学报(英文版)

基　　金：Projects(51878103,52208370)supported by the National Natural Science Foundation of China;Project(cstc2020jcyjcxtt X0003)supported by the Innovation Group Science Foundation of the Natural Science Foundation of Chongqing,China;Project(2022CDJQY-012)supported by the Fundamental Research Funds for the Central Universities,China。

摘　　要：To understand the specific behaviors of coastal coral sand slope foundations,discrete element method(DEM)was employed to examine the effect of breakable particle corners on the performance of coral sand slope foundations under a strip footing,from macro to micro scales.The results demonstrate that the bearing characteristics of coral sand slope foundations can be successfully modeled by utilizing breakable corner particles in simulations.The dual effects of interlocking and breakage of corners well explained the specific shallower load transmission and narrower shear stress zones in breakable corner particle slopes.Additionally,the study revealed the significant influence of breakable corners on soil behaviors on slopes.Furthermore,progressive corner breakage within slip bands was successfully identified as the underling mechanism in determining the unique bearing characteristics and the distinct failure patterns of breakable corner particle slopes.This study provides a new perspective to clarify the behaviors of slope foundations composed of breakable corner particle materials.为研究海成珊瑚砂斜坡地基中的特殊承载行为,本文采用离散元法(DEM)从宏观到微观尺度上研究易碎颗粒棱角对条形基础下珊瑚砂斜坡地基承载性能的影响。结果表明,数值模拟中利用易碎棱角颗粒可以较好地模拟出珊瑚砂斜坡地基的承载特性。棱角的嵌锁与破碎双重效应可很好地解释易碎棱角颗粒斜坡地基中载荷传递较浅与剪应力区分布较窄的现象。在此基础上,揭示了易碎颗粒棱角对斜坡地基中土体行为的显著影响;进一步发现滑移带内棱角的渐进破碎是决定珊瑚砂斜坡地基承载和失效模式特殊的内在原因。本研究为分析棱角颗粒构成的斜坡地基特殊承载行为提供了新的思路。

关 键 词：micromechanical analysis coral sand slope foundation particle corner breakage corner interlock 

分 类 号：TU43[建筑科学—岩土工程]