摘要
首先建立单一微裂纹在单轴压缩荷载作用下的力学模型,求出裂纹端部的应力分量。然后采用最大周向应力理论(σθ准则),求出岩石的断裂角,得出断裂角只与裂纹和荷载方向的夹角有关。在压-剪复合应力状态下,裂纹将沿着初始断裂角0θ的方向开始扩展。进而得出岩石的宏观断裂模式,即裂纹的发展形状是折线形的,最终详细地阐述了岩石的破坏机理。
A mechanical model is built firstly for single microcrack under uniaxial compression loading, and the stress component of microcrack end is calculated. Then the maximum circumferential stress theory （ σθ criterion） is used to calculate the break angle of rock, and the result shows that the break angle is related to the angle of microcrack and loading orientation. In press-shear complicated stress condition, the mierocrack expands along the direction of initial break angle θ0. On this basis, the macroscopical fracture mode is deduced, that the development form of microcrack is a brokwn line, finally the failure mechanisms of rock is expounded in detail.
出处
《地下空间与工程学报》
CSCD
2006年第6期1076-1080,共5页
Chinese Journal of Underground Space and Engineering
基金
教育部科学技术重点项目(3113)资助
关键词
岩石
破坏机理
损伤
断裂
rock
failure mechanism
damage
fracture
