基于离散元法三裂纹岩石裂纹扩展特征的试验与数值研究
Experimental and numerical study of crack propagation characteristics of tri-cracked rocks based on distinct element method
祁敬茗 1张红丹 1周磊 1陈剑星 1马雷钧 1肖晓冬1
作者信息
- 1. 四川大学建筑与环境学院,四川成都 610065;深地工程智能建造与健康运维全国重点实验室,四川 成都 610065
- 折叠
摘要
为研究三裂纹岩石的静力学破坏特征,采用离散元数值模拟软件PFC2D和模型试验方法,分析三裂纹岩石的峰值应力、应力—应变曲线及裂纹扩展特性,验证离散元数值模拟方法的可行性.通过改变岩石的水平围压和裂纹长度,分析单轴压缩载荷作用下三裂纹岩石的力学响应机制.研究结果表明:中间横向裂纹对裂纹岩石的峰值应力影响较大,中间竖向裂纹对裂纹岩石的峰值应力影响较小;加载过程中裂纹尖端最先出现应力集中现象,最后形成2条约70°的主裂纹贯通3条预制裂纹;随着围压的增大,三裂纹岩石的峰值应力先增大后减小;随着裂纹长度的增加,三裂纹岩石的峰值应力不断减小.
Abstract
In order to study the static damage characteristics of the tri-cracked rock,the distinct element numerical simulation software PFC2D and model tests were used to analyze the peak strength,stress-strain curve and crack propagation characteristics of the tri-cracked rock,and to verify the feasibility of the distinct element numerical simulation method.By varying the horizontal confining pressure and crack length of rock,the mechanical response mechanism of the tri-cracked rock under uniaxial compressive loading was analyzed.The results show that the intermediate transverse crack has a greater effect on the peak stress of the cracked rock,and the intermediate vertical crack has a less effect on the peak stress of the cracked rock.During the loading process,stress concentration occurs at the crack tip primarily and ultimately two main cracks of about 70° are formed through three prefabricated cracks.With the increase of confining pressure,the peak stress of the tri-cracked rock increases first and then decreases.
关键词
三裂纹岩石/裂纹扩展/数值模拟/离散元法/裂纹倾角/预应力/裂纹长度/峰值应力Key words
tri-cracked rock/crack propagation/numerical simulation/distinct element method/crack inclination angle/pre-stress/crack length/peak stress引用本文复制引用
基金项目
国家自然科学基金项目(52204104)
四川省科技计划项目(2023YFH0022)
四川省科技计划项目(24SYSX0034)
出版年
2024
NETL
NSTL
万方数据