[1]蒋银杰,汤 旭,方 鑫,等.基于离散元的含砾砂土剪切特性数值模拟[J].华南地震,2026,46(04):64-70.[doi:10.13512/j.hndz.2026.04.08]
　JIANG Yinjie,TANG Xu,FANG Xin,et al.Numerical Simulation of Shear Characteristics for Gravelly Sand Based on Discrete Element Method[J].,2026,46(04):64-70.[doi:10.13512/j.hndz.2026.04.08]
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基于离散元的含砾砂土剪切特性数值模拟()

华南地震[ISSN:1006-6977/CN:61-1281/TN]

卷:
46
期数:
2026年04期
页码:
64-70
栏目:
土木工程防震减灾
出版日期:
2026-07-09

文章信息/Info

Title:
Numerical Simulation of Shear Characteristics for Gravelly Sand Based on Discrete Element Method
文章编号:
1001-8662（2026）04-0064-07
作者:
蒋银杰1; 2; 汤 旭1; 2; 方 鑫1; 游家乐1; 吉 文1
1.江苏省地质局第一地质大队，南京 210041;2.江苏南京地质工程勘察院有限公司，南京 210041
Author(s):
JIANG Yinjie1; 2; TANG Xu1; 2; FANG Xin1; YOU Jiale1; JI Wen1
1.The First Geological Brigade of Jiangsu Geological Bureau, Nanjing 210041, China;2.Jiangsu Nanjing Geologi?cal Engineering Survey Institute Co., Ltd., Nanjing 210041, China
关键词:
含砾砂土; 抗剪强度; 剪应力比; 内摩擦角; 力链
Keywords:
Gravelly sand;  Shear strength;  Shear stress ratio;  Internal friction angle;  Force chains
分类号:
TU43
DOI:
10.13512/j.hndz.2026.04.08
文献标志码:
A
摘要:
含砾砂土剪切特性对边坡与基坑的稳定性影响显著。通过离散元数值模拟对砾石含量为0%~25%的砂土进行了模拟，从宏观和微观两个角度研究了其剪切过程中的力学行为及孔隙结构特征。结果表明：含砾砂土呈应变软化特征，剪应力随位移先达峰值后降至残余强度。纯砂土抗剪强度最优，砾石含量增至25%时强度降低15%~18%。高应力下材料呈非线性强度特性，法向压力由100kPa增至300kPa时最大剪应力比下降16%，内摩擦角随砾石含量递增而递减。微观分析表明，砾石含量增加促使剪切带内粗颗粒主导应力传递，孔隙比在剪切过程中增长约30%~60%，颗粒重排加剧了应变软化。研究揭示了砾石含量对砂土力学特性的宏微观双重调控机制，为含砾砂土地基稳定性评估及边坡、基坑工程设计提供理论依据。
Abstract:
The shear characteristics of gravelly sand significantly influence the stability of slopes and foundation pits. Discrete element numerical simulations were conducted on sand with gravel content ranging from 0% to 25% to investigate their mechanical behavior and pore structure evolution during shearing process from macro-micro per?spectives. Results demonstrate that gravelly sand exhibits strain-softening behavior, whereby shear stress first reach?es the peak value with incresing displacement and then decreases to the residual strength. The shear strength of pure sand is optimal, decreaseing by 15%-18% when the gravel content increases to 25%. The material exhibits nonlinear strength characteristics under high stress. When the normal pressure increases from 100 kPa to 300 kPa, the maximum shear stress ratio decreases by 16 %, and the internal friction angle declines with the increase of grav?el content. Microstructural analysis shows that the increase of gravel content promotes the stress transmission domi?nated by coarse particles in the shear band, while the void ratio increases by approximately 30%-60% during shear?ing, and the particle rearrangement aggravates the strain softening. This study reveals the macro and microscopic du?al regulation mechanism of gravel content on the mechanical properties of sand, which provides a theoretical basis for the stability evaluation of gravelly sand foundations as well as the engineering design of slopes and foundation pits.

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备注/Memo

备注/Memo:
收稿日期：2025-10-09
基金项目：江苏省地质局科研项目（2022KY02）
作者简介：蒋银杰（1989-），男，高级工程师，研究方向为工程勘察和地质灾害防治技术。E-mail: 857379278@qq.com
更新日期/Last Update: 2026-07-20