水力发电2025，Vol.51Issue(5)：30-36,111,8.
基于力链的土体直剪试验颗粒流数值模拟研究
Particle Flow Numerical Simulation of Direct Shear Test of Soil Based on Force Chain
摘要
Abstract
Studying the macroscopic mechanical behavior of geotechnical materials from a mesomechanical perspective is a key focus in geotechnical engineering.This study conducts direct shear tests on undisturbed loess,and based on the PFC2D particle flow method,establishes a direct shear model to analyze force chain distribution and changes in contact force direction during the shear process,for investigating the macroscopic mechanical behavior of soils during direct shear from a mesoscopic viewpoint.The results indicate a strong consistency between laboratory direct shear tests and numerical simulations,confirming the reliability of the simulations.Before the peak shear stress is reached,the force chain network undergoes systematic changes,with strong force chains gradually concentrating from the vertical direction toward the bisector of the shear angle.At peak shear stress,the contact force direction within the material forms an approximately 40° angle with the horizontal axis,and as the shear displacement increases further,some strong force chains exceed their load capacity and fracture,and then transition into weaker force chains that redistribute within the material.关键词
黄土/直剪试验/颗粒流方法/力链/接触力方向Key words
undisturbed loess/direct shear test/particle flow method/force chain/contact force direction分类
土木建筑引用本文复制引用
朱建,万加根,季圣星,孙军,周领,汤锦荣,许涛..基于力链的土体直剪试验颗粒流数值模拟研究[J].水力发电,2025,51(5):30-36,111,8.基金项目
国家自然科学基金资助项目(52264003) （52264003）
