The stiffness of the bolts are added to the integer stiffness matrix . 44 5 . the above theories are applied in the stability analysis of the 5 machine set of pubugou hydropower underground cavity group 将锚杆的劲度加入到系统的整体劲度矩阵中,直接而又比较客观的反映了锚杆对岩体的加固效果,并推导了相应的理论公式。