不同倾角裂隙砂岩单轴压缩颗粒流模拟分析

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英文篇名：Simulation analysis of uniaxial compression particle flow of sandstone with different dip angles 作者：袁丽景 英文作者：YUAN Lijing;School of Civil Engineering,Henan Polytechnic University; 关键词：单轴压缩 ; 颗粒流 ; 倾角裂隙 ; 裂纹扩展 英文关键词：uniaxial compression;;particle flow;;fissure dip angle;;crack propagation 中文刊名：中原工学院学报 英文刊名：Journal of Zhongyuan University of Technology 机构：河南理工大学土木工程学院; 出版日期：2019-08-25 出版单位：中原工学院学报 年：2019 期：04 语种：中文; 页：58-62+66 页数：6 CN：41-1341/T ISSN：1671-6906 分类号：TU45

摘要

为探索不同倾角裂隙岩体在单轴压缩作用下的破坏形式,利用二维颗粒流程序(PFC2D)对不同倾角裂隙岩体试样进行单轴压缩数值模拟,研究了不同倾角裂隙岩体的强度变化规律、破坏形式以及裂纹扩展路径。结果表明:不同倾角预制裂隙岩体的破坏模式略有不同;不同倾角预制裂隙岩体破坏过程基本一致,都会经历弹性变形阶段、裂纹稳定扩展阶段、岩体失稳阶段3个阶段;不同倾角裂隙的存在使得岩体的抗压强度有不同程度的降低;在单轴压缩破坏中,裂隙的顶点应力集中现象比较严重,沿裂隙岩体对角线方向产生的裂纹最多。该数值模拟分析为进一步探索地下工程中裂隙岩体失稳破坏规律提供了参考。
        In order to explore the failure modes of rock masses with different dip angles under uniaxial compression,the two-dimensional particle flow program(PFC2 D)was used to simulate the uniaxial compression of rock specimens with different dip angles,and the rock masses with different dip angles were studied by focusing on the law of strength variation,the form of failure,and the path of crack propagation.The results show that the failure modes of prefabricated fractured rock masses with different dip angles are slightly different.The failure processes of prefabricated fractured rock masses with different dip angles are basically the same,and they will go through three stages,namely elastic deformation stage,crack stability expansion stage and rock mass instability stage.The existence of different dip angle cracks causes the compressive strength of rock mass to decrease to some extent.In the uniaxial compression failure,the stress concentration at the apex of the fissure is more serious,and the crack along the diagonal direction of the fractured rock mass is the most.It provides a reference for further exploring the instability and failure law of fractured rock mass in underground engineering.

引文

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