高静水压力下Mohr–Coulomb准则的拓展研究  

EXTENDED STUDY OF MOHR–COULOMB CRITERION UNDER HIGH HYDROSTATIC PRESSURE

作　　者：王宏伟[1,2] 李宗洋 秦舒 陶志刚[2] 杨柳[2] WANG Hongwei;LI Zongyang;QIN Shu;TAO Zhigang;YANG Liu(School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;State Key Laboratory for Tunnel Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Beijing Construction Engineering Quality First Testing Institute Co.,Ltd.,Beijing 100039,China)

机构地区：[1]中国矿业大学(北京)力学与土木工程学院,北京100083 [2]中国矿业大学(北京)隧道工程灾变防控与智能建养全国重点实验室,北京100083 [3]北京市建设工程质量第一检测所有限责任公司,北京100039

出　　处：《力学与实践》2023年第6期1331-1339,共9页Mechanics in Engineering

基　　金：煤炭安全精准开采国家地方联合工程研究中心(安徽理工大学)开放基金(EC2022001);中国矿业大学(北京)研究生教育教学改革项目(YJG2023010);国家重点研发计划项目(2022YFC3004602)资助。

摘　　要：深部开采时极端环境下的岩体高应力和高地压是影响工程安全的主要因素。本文指出了Mohr–Coulomb准则(简称M–C准则)在高静水压力下无法判断岩石材料发生屈服破坏的问题,开展了岩样在高应力下的三轴压缩实验,观察了高静水压力下岩石材料的破坏现象,推导了高静水压力条件下M–C准则的拓展方程。研究结果显示,与现有M–C准则不同的是,材料剪切强度随轴压和围压之差增大到某一峰值时将逐渐减小,岩样在高静水压力下也可发生屈服破坏,M–C准则拓展方程与实验结果基本吻合。同时,本文探讨了低静水压力下M–C屈服面的下限和高静水压力下M–C屈服面的上限。研究成果可为深部工程的安全高效开展提供理论参考。High stress and high ground pressure of rock mass under extreme environment in deep mining are the main factors affecting engineering safety.This study points out that the Mohr–Coulomb criterion(M–C criterion for short)cannot judge the yield failure of rock materials under high hydrostatic pressure.The triaxial compression experiments of rock samples under high stress were carried out to observe the failure phenomenon of rock materials under high hydrostatic pressure,and the developed equation of M–C criterion under high hydrostatic pressure was derived.The results show that,different from the existing M–C criterion,the shear strength decreases gradually when the difference between axial and confining pressures increases to a certain peak value,and rock samples can also yield failure under high hydrostatic pressure.The developed equation of M–C criterion is in principle consistent with the experimental results.Meanwhile,the lower limit of M–C yield surface under low hydrostatic pressure and the upper limit of M–C yield surface under high hydrostatic pressure are discussed.The research results can provide theoretical reference for the safe and efficient development of deep engineering.

关 键 词：MOHR-COULOMB准则 高静水压力 三轴实验 屈服面 

分 类 号：O34[理学—固体力学]