An elastoplastic constitutive model considering local damage mechanism for granular materials  

作　　者：WANG Xiaochan ZHI Bin LIU Enlong WANG Pan LAN Hengxing 

机构地区：[1]School of Geological Engineering and Geomatics,Chang'an University,Xi’an 710054,China [2]School of Architecture and Civil Engineering,Xi'an University of Science and Technology,Xi’an 710000,China [3]State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610065,China [4]College of water Resources and Hydropower,Sichuan University,Chengdu 610065,China

出　　处：《Journal of Mountain Science》2025年第4期1274-1288,共15页山地科学学报(英文)

基　　金：the National Natural Science Foundation of China(Grant No.12372376);the Scientific Innovation Practice Project of Postgraduates of Chang’an University(300103724017)。

摘　　要：Particle shape and local breakage significantly affect the deformation characteristics of crushable granular materials.However,in the existing constitutive model research,there is less introduction of particle shape on particle breakage.A quantitative parameter for the three-dimensional particle shape(Average spherical modulus G_(M))is proposed in this study.Combined with G_(M),the triaxial compression test of granular materials with different particle shapes was carried out,and the particle size distribution before and after the test was determined.The results indicate that the local damage mechanism governs the macroscopic deformation behavior of granular materials,as influenced by the particle gradation of the samples before and after the triaxial compression test.Based on these findings,a binary medium model with a friction element weakening factor is proposed.This model incorporates the effects of particle shape and breakage behavior,significantly enhancing its calculation accuracy.Experimental results demonstrate that the model effectively predicts the deformation of crushable granular materials,accounting for particle shape.

关 键 词：Crushable granular materials Particle shape Particle breakage Binary medium model 

分 类 号：TU43[建筑科学—岩土工程]