摘要
基于广义Hoek-Brown准则的非线性统一强度理论不仅考虑了中间主剪应力效应及其区间性,而且将统一屈服准则、统一强度理论、岩石的非线性统一强度理论联系起来,对在三向应力状态下岩石的破坏特性比较适用。本文利用广义非线性统一强度对平面状态下岩石的强度破坏进行了研究,得到了基于广义非线性统一强度理论的包络线方程,分析了有效剪应力和内摩擦角随有效正应力的变化规律,讨论了中间主剪应力效应参数对剪切破坏包络线及内摩擦角的影响。参数分析结果表明:在平面应变状态下,有效剪应力随着中间主剪应力效应参数的增大而增大,而内摩擦角随中间主剪应力效应参数的增大趋于稳定。
Nonlinear unified strength theory based on generalized Hoek-Brown criterion not only considers the effects and the interval of intermediate principal shear stress, but also combines the unified yielding criterion, the unified strength theory, the rock nonlinear unified strength theory, which is applicable to the failure characteristics of rock under three-dimensional stress state. In this paper, using the generalized nonlinear unified strength theory, the rock strength under the condition of plane failure is researched, the envelope equation of generalized nonlinear unified strength theory based on the analysis of the variation of effective shear stress and internal friction angle with effective stress is obtained, the effects of intermediate principal stress parameters on shear failure envelope line and angle of internal friction are discussed. The results of parametric analysis indicate that under plane strain state, the effective shear stress increases with the increase of intermediate main shear stress effect parameter, while the internal friction angle tends to be stable with the increase of intermediate main shear stress effect parameter.
作者
周凤玺
甘东彪
乔雄
Zhou Fengxi;Gan Dongbiao;Qiao Xiong(School of Civil Engineering,Lanzhou University of Technology,730050,Lanzhou,China;Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education,730050,Lanzhou,China)
出处
《应用力学学报》
CAS
CSCD
北大核心
2019年第1期190-195,263,共7页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金(11162008
51368038)
关键词
破坏准则
平面应变
莫尔圆
非线性统一强度理论
剪切破坏
failure criterion
plane strain
Mohr circle
nonlinear unified strength theory
shear failure
作者简介
第一作者:周凤玺,男,1979年生,博士,兰州理工大学,教授,研究方向——土动力学、岩土力学。E-mail:geolut@163.com;通讯作者:甘东彪,男,1990年生,硕士生,研究方向——隧道工程。E-mail:745410851@qq.com.
