工程地质学报2025，Vol.33Issue(6)：2147-2159,13.DOI:10.13544/j.cnki.jeg.2025-0016
基于三维精细模型的不同含石量下软岩风化土石混合体变形机理研究
DEFORMATION MECHANISM OF THE SOFT ROCK WEATHERED SOIL-ROCK MIXTURES UNDER DIFFERENT BLOCK PROPORTIONS BASED ON 3D REFINED MODELS
摘要
Abstract
The mechanical behavior of soil-rock mixtures is strongly influenced by the volumetric block proportion(VBP).In soft rock-weathered soil-rock mixtures,the brittle nature of the rock blocks further complicates their mechanical response.This study employed CT scanning to reconstruct three-dimensional block models and developed an efficient fine-scale discrete element modeling approach that incorporates realistic block morphology and block breakage.Numerical direct shear tests were performed under varying VBP conditions to analyze macro-and meso-mechanical characteristics,revealing the influence of VBP on shear dilation and shear strength in soft rock-weathered soil-rock mixtures.The results indicate that with increasing VBP,the shear strength,dilation,block rotation,block interlocking force,degree of block breakage,frictional energy dissipation,cohesion,and internal friction angle all increase.Block rotation enhances mixture dilation,while increased interlocking between blocks contributes to shear strength;however,block breakage tends to reduce both dilation and strength.Under low normal stress,dilation is primarily governed by block rotation,and shear strength is mainly controlled by block interlocking.Under high normal stress,severe breakage of soft rock blocks reduces the rate at which shear strength and maximum dilation increase with rising VBP.关键词
软岩风化土石混合体/含石量/三维精细模型/块石破碎/影响机制Key words
Soft rock weathered soil-rock mixture/Block proportion/3D refined model/Block breakage/Effect mechanism分类
建筑与水利引用本文复制引用
杨升乾,朱正军,章涵,车德龙,廖述凯..基于三维精细模型的不同含石量下软岩风化土石混合体变形机理研究[J].工程地质学报,2025,33(6):2147-2159,13.基金项目
国家自然科学基金项目(资助号:42207218),湖北省水利科技推广项目(资助号:HBSLKJTG202502),三峡大学横向科研项目(资助号:SDHZ20240124).This research is supported by the National Natural Science Foundation of China(Grant No.42207218),Hubei Province Water Conservancy Science and Technology Promotion Project(Grant No.HBSLKJTG202502)and Horizontal research project of Three Gorges University(Grant No.SDHZ20240124). （资助号:42207218）
