A micro-investigation on water bridge effects for unsaturated granular materials with constant water content by discrete element method  

作　　者：Mengchen Li Jiyuan Luan Xuguang Gao Ji-Peng Wang Abdelali Dadda 

机构地区：[1]School of Civil Engineering,Shandong University,17922 Jingshi Road,Jinan,250061,China

出　　处：《Particuology》2023年第12期50-62,共13页颗粒学报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(grant numbers:51909139,52011530458).

摘　　要：The most common state of surface soil is unsaturated.Changes in water content will substantially impact its strength,leading to geological and engineering catastrophes.This paper used LIGGGHTS software to simulate the water bridge effect of unsaturated granular materials with constant water content and verify the rationality of the simplification of the stress-force-fabric(SFF)relationship.The results showed that the capillary force was not isotropic,which was different from the previous study,thus it cannot be overlooked in the simplification of the SFF relationship.Moreover,the influence of water content on the macroscopic mechanical behavior of unsaturated granular materials was interpreted through the evolutions of coordination number,interparticle force,fabric and force anisotropy,and other microscopic parameters.Compared to the literature,we found that different water bridge models would not change the characteristics of the solid skeleton.

关 键 词：Unsaturated granular material Water bridge effect Water content Discrete element method Stress-force-fabric(SFF)relationship 

分 类 号：O62[理学—有机化学]