基于损伤断裂理论的岩石破坏机理研究_刘洋.pdfVIP

　 2　 6 　　 Vo.l 2　　 2006 12 　　Chinese Journal of Underground Space and Engineering Dec. 2006　 　　:1673-0836(2006)06-1076-05 * 基于损伤断裂理论的岩石破坏机理研究 1 1 2 刘　洋, 何沛田, 赵明阶 (1. , 　 0001 ;2. , 　 0007 ) 　:首先建立单 一微裂纹在单轴压缩荷载作用下的力学模型, 出裂纹端部的应力分 量。然后采用最大周向应力理论(σ准则 ), 出岩石的断裂角, 得出断裂角只与裂纹和荷载 θ 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 θ的方向开始扩展。进 0 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。 :岩石;破坏机理;损伤;断裂 　　:TD315. 1 :A Research ofRock FailureM echanism s Based on D am age and Fracture Theories 1 1 2 LIU Y ang, HE Pe-i tian, ZHAO M ing-jie (1. Chongqing Rock Foundation Research Center of YangtzeR iverScientificR esearch Institute, Chongqing 0001, China; 2. School of R iver and Ocean Engineering, Chongqing Jiaotong University , Chongqing 0007 , China ) Abstrac:t A m echanicalm odel is built firstly for single m icrocrack under un iaxial com pression loading, and the stress com ponent of m icrocrack end is calcu lated. Then the m axmi um circum feren tial stress theory (σ criterion) is θ used to calcu late the break angle of rock, and the resu lt show s that the break angle is related to the angle of m icro-c rack and load ing orientation. In p res-s shear comp licated stress condition, the m icrocrack expands along the direction of initial break angleθ. On thi