【摘要】 岩体所表现出来的力学性质和工程特性主要受其内部的结构面控制，正因为结构面的重要性，大量学者对此进行了大量研究，也取得了许多有意义的成果，但对于台阶状结构面在剪切试验过程中的破裂贯通机制、裂纹演化过程分析等方面研究相对较少。为进一步阐明台阶状岩石结构面裂纹扩展贯通的机制，设计两种不同间距的台阶状结构面进行剪切试验。结合直剪试验与PFC^2D数值模拟，将台阶状岩石结构面破裂过程分为线弹性阶段、初裂阶段、稳定发展、失稳扩展和残余摩擦5个阶段。通过三维激光扫描技术，分析并揭示了台阶状结构面在直剪过程中的破裂贯通过程，并对裂纹产生的位置、结构面破坏区域的划分进行了阐述，取得了较好的效果。更多还原

【Abstract】 The mechanical and engineering properties of rock mass are mainly controlled by its internal structural plane. Because of the importance of structural plane, a large number of scholars have done a lot of research on it and achieved many meaningful results. However, there are few studies on the fracture and coalescence mechanism and crack evolution process of stepped structural plane in shear test. In order to further clarify the mechanism of crack propagation and coalescence of step-like rock structural planes, two kinds of step-like structural planes with different spacing were designed for shear test. Combined with direct shear test and PFC^2D numerical simulation, the failure process of step-shaped rock joints is divided into five stages : linear elastic stage, initial crack stage, stable development stage, unstable extension stage and residual friction stage. Through 3D laser scanning technology, the rupture and coalescence process of step structural plane in direct shear process is analyzed and revealed. The location of cracks and the division of failure area of structural plane are expounded. Good results are obtained.更多还原