考虑砾石形状的边坡降雨入渗模型试验及数值分析

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中图分类号：P642.22 文献标志码：A 文章编号：2096-6717（2025）06-0032-11

Abstract： In order to study the influence of gravel shape on the stability and deformation damage characteristics of gravel-bearing granite residual soil slopes under rainfall conditions，the macroscopic vertical displacement and deformation damage of slopes as well as the change of wetting front were comparatively analyzed by carrying out rainfallslope modeling test and combining with the numerical simulation of CFD-DEM to analyze the developmental patern of displacement field and sliding surface，the fine-scale contact force chain，coordination number，and group structure anisotropy.The results show that： the safety coefficient of slopes containing rounded gravel is the smallst and that of slopes containing angular gravel is the largest.With the increase of precipitation time from O to 3 hours，the safety coeficients of slopes containing rounded gravel，pebble gravel and angular gravel decrease by 40% ， 33% and 32% ，respectively，and the degree of influence by rainfall is in descending order of rounded gravel，pebble gravel and angular gravel slopes.With the increase of the aspect ratio and prism angle，theembedded occlusion effect of gravel is gradually enhanced，and the three damage modes of circular arc damage，toothed arc damage，and ofset damage appear in the corresponding slopes in descending order;after the slope's destabilization and failure，the strong contact force chains of the rounded gravel-containing，pebblegravel-containing，and angular gravel-containing slopes are characterized by intertwined，weak continuity，and unevenness distribution; with the increase of the aspect ratioand prism angle of the gravels，the extent of the contact anisotropy of rounded gravel-containing，pebble gravel-containing and angular gravel-containing slopes is gradually increased.

Keywords： rainfallinfiltration; slope stability；granite residual soil;； gravel shape；displacement field；slidingsurface

含砾花岗岩残积土边坡的稳定性主要受内在因素（如砾石含量、形状、空间分布等）与外在因素（如降雨、地震、基坑开挖等）共同作用的影响[1-3]。（剩余15694字）