非贯通节理黄土单轴压缩裂纹扩展特征颗粒流分析

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中图分类号：TU411 文献标志码：A 文章编号：1000-0844（2025）05—1038—10

DOI：10.20000/j.1000-0844.20240324002

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 I 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 combined tension-compression stress. Wing cracks represent tensile fractures driven by DF-II displacement fields，and secondary cracks form tension-shear fracture zones through multi-type displacement fields. Accelerated crack growth correlates with rapid elastic strain energy release and exponential growth in dissipated energy.

Keywords： road engineering; jointed loess; particle flow; crack propagation; meso-mechanism

0 引言

黄土中存在着大量规模不同、产状各异的节理裂隙，是诱发山体滑坡、崩塌、边坡失稳等诸多工程问题的重要因素[1]。（剩余15108字）