地震工程学报2025，Vol.47Issue(5)：1038-1047,10.DOI:10.20000/j.1000-0844.20240324002
非贯通节理黄土单轴压缩裂纹扩展特征颗粒流分析
Particle flow analysis of crack propagation characteristics in nonpersistent jointed loess under uniaxial compression
摘要
Abstract
The meso-mechanism of crack propagation in jointed loess was investigated using the particle flow code PFC2D,which simulated uniaxial compression tests on nonpersistent jointed loess.Numerical results showed good agreement with experimental data.On this basis,further analysis of crack evolution during different loading stages was conducted from the perspectives of stress fields,displacement fields,and energy perspectives.The results demonstrate that crack propagation progress can be divided into three phases:phases Ⅰ and Ⅱ dominated by wing cracks,and phase Ⅲ characterized by halted wing crack growth and rapid secondary crack coalescence.Wing cracks extend vertically under tensile stress,whereas secondary cracks develop under com-bined tension-compression stress.Wing cracks represent tensile fractures driven by DF-Ⅱ dis-placement fields,and secondary cracks form tension-shear fracture zones through multi-type dis-placement fields.Accelerated crack growth correlates with rapid elastic strain energy release and exponential growth in dissipated energy.关键词
道路工程/节理黄土/颗粒流/裂纹扩展/细观机制Key words
road engineering/jointed loess/particle flow/crack propagation/meso-mechanism分类
建筑与水利引用本文复制引用
孙纬宇,贾乐琪,张威,朱辉,严松宏,王丽丽,张建..非贯通节理黄土单轴压缩裂纹扩展特征颗粒流分析[J].地震工程学报,2025,47(5):1038-1047,10.基金项目
国家自然科学基金(52208392,52068044,52168058) （52208392,52068044,52168058）
中国博士后科学基金(2021M693843) （2021M693843）
地震科技星火计划(XH23043YA) （XH23043YA）
