DEM investigation into the coupling effects of particle asphericity and interface roughness on shear behaviour of soil-structure interface  

作　　者：Dong Su Dongzhan Wu Meng Fan Runqi Zhang Jianhang Chen Hao Xiong Xiangsheng Chen 

机构地区：[1]State Key Laboratory of Intelligent Geotechnics and Tunnelling(Shenzhen University),Shenzhen,518060,China [2]Key Laboratory of Coastal Urban Resilient Infrastructures(Shenzhen University),Ministry of Education,Shenzhen,518060,China [3]College of Civil and Transportation Engineering,Shenzhen University,Shenzhen,518060,China [4]National Engineering Research Center of Deep Shaft Construction,Shenzhen,518060,China

出　　处：《Particuology》2025年第2期39-57,共19页颗粒学报(英文版)

基　　金：The authors sincerely appreciate the financial support from the National Natural Science Foundation of China(grant No.52278364);the Shenzhen Science and Technology Plan(grant No.20220808143139001);Shenzhen University 2035 Program for Excellent Research(grant No.2022B007)。

摘　　要：Soil-structure interfaces(SSI)are common in geotechnical structures,and understanding their shear behavior is essential for effective design.However,the coupling effects of particle shape and interface roughness on SSI remain understudied.This study addresses this gap by employing five types of super-ellipsoid particles with varying asphericity(η)values to model non-spherical particles.Interface shear tests with different roughness levels(Rn)were conducted using Discrete Element Method(DEM)simulations.The results show that bothηand Rn significantly influence shear strength,localized shear band thickness,and soil fabric,with two types of coupling effects:single-factor dominance and double-factor interaction.The influence on coordination number(C_(n))and probability distribution of normalized contact force is more straightforward.Specifically,non-spherical particles exhibit a higher initial C_(n) due to enhanced interlocking,while Rn has a lesser impact.The normalized contact force at the interface follows an exponential distribution,similar to pure soil,and is largely independent of η and Rn.Notably,the shear zone is divided into three equal parts for soil fabric analysis.These findings offer new insights into SSI,contributing to more effective and safer geotechnical designs.

关 键 词：Soil-structure interface Particle asphericity Interface roughness Coupling effect Shear behavior 

分 类 号：TU435[建筑科学—岩土工程]