基于能量判据的剪切破坏型危岩主控结构面断裂扩展研究

将剪切型危岩主控结构面按受力机理归纳为压剪和拉剪两种形式，其本质是Ⅰ-Ⅱ复合型裂纹的断裂扩展问题。应用最大应变能释放准则，建立危岩主控结构面开裂角θ0和断裂韧度GIC的计算方法。选取重庆万州首立山典型危岩进行计算，结果表明，其断裂角与基于最大周向应力准则的断裂角计算结果一致，主控结构面的开裂方向均是指向临空面方向，初步验证了方法的可行性。

Fracture Propagation of Control Fissures Based on Energy Criterion in Share-Type Unstable Rock

According to the force mechanism, the control fissures of shear-type unstable rocks are classified into compression-shear and tension-shear types. A calculating method of cracking angle (θ0) and fracture toughness (GIC) are put forward using a maximum strain energy release criterion. Taking Shoulishan typical unstable rocks in Wanzhou district of Chongqing, China, as examples, the calculation results show that the cracking angles with maximum strain energy release criterion are the same as those with maximum circumferential stress criterion. The cracking direction of the control fissures points to the free face.