牙兰开,刘远明,陈庆芝,王忠星,张策,王义乾,田茂亮

• 1:贵州大学土木工程学院
• 2:中铁开发投资集团有限公司

摘要(Abstract)：

【目的】旨在揭示不同倾角区间的随机节理对岩体破坏特征、抗剪强度和剪切模量尺寸效应的影响规律。【方法】利用PFC~(2D)离散元软件的SRM技术，结合分形理论和Monte Carlo方法，对不同尺寸、内嵌随机节理的类岩体进行数值模拟直剪试验。【结果】结果表明：(1)岩体抗剪强度随内嵌随机节理倾角区间的增大均呈现“S”型非线性特征，且最小值多出现在15°～30°区间，最大值均在60°～75°区间。(2)不同尺寸的内嵌随机节理倾角区间变化对岩体破坏影响效果相似。低倾角区间出现明显的优势破坏面和次优势破坏面，随着倾角区间增大，其应力集中发生向节理中部转移，两优势破坏面的优势发生转换。(3)随机节理倾角区间变化显著影响岩体抗剪强度和剪切模量的尺寸效应，且对岩体抗剪强度尺寸效应的影响大于对剪切模量尺寸效应的影响。【结论】研究了相同尺寸条件下内嵌随机节理倾角区间变化对节理岩体抗剪强度及破坏特征的影响和不同尺寸条件下内嵌随机节理倾角区间变化对节理岩体抗剪强度和剪切模量尺寸效应的影响，为岩体力学性质的预测和工程应用提供了重要的参考价值。

关键词(KeyWords)： SRM法;PFC;随机节理;直剪试验;尺寸效应;抗剪强度;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(52064008);; 贵州省科学技术基金(黔科合基础-ZK[2022]一般082);; 贵阳城市轨道交通科研项目(GD3-FW-YJ-05-2020-13-ZB)

作者(Author): 牙兰开,刘远明,陈庆芝,王忠星,张策,王义乾,田茂亮

DOI: 10.13928/j.cnki.wrahe.2025.01.018

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