摘要
危岩失稳的本质是主控结构面在荷载作用下产生的断裂扩展。从宏观力学角度来看,复合型危岩主控结构面受力机理可概括为压剪、拉剪两种形式。通过介绍主控结构面内渗透力的计算模型,应用线弹性断裂力学的最大周向应力准则,建立了在渗透力作用下两种受力形式的危岩主控结构面应力强度因子和断裂角的计算方法。以重庆万州首立山危岩为例计算结果表明,渗透力的存在使得应力强度因子明显增大,并分别就动、静水压力的影响作了分析。
Crack propagation of control fissures in perilous rock under loads is a key process in the failure of perilous rock. Based on the loading mechanism, the control fissures are classified into compression shear and tension-shear types. By introducing a model of seepage stress, the calculating principle of the stress intensity factor and the propagation orientation of control fissure under seepage stress are put forward using fracture mechanics methods. Using Shoulishan perilous rock in the Wanzhou district of Chongqing, P. R. China, as an example, the calculated results show that there is an obvious increase of the stress intensity factor. The influence of hydrostatic pressure and hydrodynamic pressure also are analyzed.
出处
《重庆建筑大学学报》
CSCD
北大核心
2008年第5期77-80,共4页
Journal of Chongqing Jianzhu University
基金
国家自然科学基金项目(50678182)
关键词
岩石力学
断裂力学
危岩
主控结构面
渗透力
应力强度因子
rock mechanics
fracture mechanics
intensity factor perilous rock
control fissure
seepage stress
stress
