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  

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

作　　者：张祎[1,2] 徐利军 王浩[1,2] 

机构地区：[1]中国地震局地震研究所(地震预警湖北省重点实验室),武汉市洪山侧路40号430071 [2]武汉地震工程研究院有限公司,武汉市洪山侧路40号430071

出　　处：《大地测量与地球动力学》2018年第2期132-135,共4页Journal of Geodesy and Geodynamics

基　　金：重庆交通大学省部共建水利水运工程教育部重点实验室开放基金(SLK2009A03)~~

摘　　要：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θ_0和断裂韧度G_(IC)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。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 （ G IC） 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 circumfer- ential stress criterion. The cracking direction of the control fissures points to the free face.

关 键 词：剪切型危岩 主控结构面 Ⅰ-Ⅱ复合型裂纹 断裂扩展 能量释放率 

分 类 号：P258[天文地球—测绘科学与技术] P694