基于离散元的平行双裂隙砂岩破裂特征和失稳机理研究
Fracture Characteristic and Instability Mechanism of Sandstone with Parallel Double Fissures Based on Discrete Element Method
孙立臣 1娄培杰 2李成杰 1姬鹏辉1
作者信息
- 1. 安徽理工大学土木建筑学院,安徽淮南市 232001
- 2. 安徽理工大学土木建筑学院,安徽淮南市 232001;中国矿业大学煤炭精细勘探与智能开发全国重点实验室,江苏徐州市 221116
- 折叠
摘要
研究双裂隙对岩体稳定性及破坏特征的影响有助于理解裂隙间的互相作用机制.运用PFC2D建立含不同空间分布的平行双裂隙砂岩试样数值模型,对其进行单轴压缩试验,分析其受载损伤特征、微裂纹演变和应力场分布,并结合宏观破坏特征,探讨试样的失稳机理.结果表明:3种双裂隙的不同空间分布使砂岩的渐进损伤过程和力学性质产生差异,并影响了微裂纹分布、数量和倾角,对岩桥破坏程度差异显著,进而形成不同的破裂区域;采用等效应力云图对不同模型峰值应力分布进行对比,并结合宏观破坏特征,从受外力角度探讨了裂隙的不同空间分布结构对试样的受力承载面和压应力传递路径的影响.研究成果可为工程实践和岩石力学研究提供参考价值.
Abstract
Studying the influence of double fissure on the stability and fracture characteristics of rock masses can help understand the interaction mechanism between fissures.Using PFC2D to established a numerical model of paralleled double fissure sandstone samples with different spatial distribution structures and conducting uniaxial compression tests on them.Analyzed the loaded damage characteristics,microcrack evolution,and stress field distribution,and explored the instability mechanism of the samples combining macroscopic failure characteristics.The results show that the different spatial distributions of three types of double fissures in differences in the progressive damage process and mechanical properties of sandstone,and affect the distribution,quantity,and inclination of microcracks,significantly influencing the degree of rock bridge damage and forming different fracture zones.The peak stress distribution of different models was compared using equivalent stress cloud maps,and the influence of different spatial distribution structures of fissures on the load-bearing surface and compressive stress transmission path of the specimen was explored from the perspective of external forces,combined with macroscopic failure characteristics.The research results can provide reference value for engineering practice and rock mechanics research.
关键词
平行双裂隙/离散元/损伤特征/应力场/失稳机理Key words
Paralleled double fissures/Discrete element/Damage characteristic/Stress field/Instability mechanism引用本文复制引用
基金项目
安徽省自然科学基金项目(2208085QE174)
煤炭精细勘探与智能开发全国重点实验室开放研究课题资助项目(SKLCRSM22KF017)
江西省地质环境与地下空间工程研究中心开放基金资助项目(JXDHJJ2022-007)
出版年
2024
NETL
NSTL
万方数据