裂隙岩体在单轴加载过程中变形、破裂规律的PFC2D数值模拟研究

运用离散元软件PFC2D模拟裂隙岩体，建立一个包含不同倾角、不同组数，宽度5cm、厚度1mm裂隙的10cm×10cm模型，分析单轴加载情况下岩体的变形、破裂规律。结果显示，在单轴加载情况下，随着倾角的增加，岩体的单轴抗压强度出现先减后增的趋势，且裂纹不断增多；随着裂隙的增多，单轴抗压强度逐渐减小。岩体的破裂区集中在裂隙的尖端点部位，以翼裂纹、次生共面裂纹和次生倾斜斜纹为主。通过分析破裂后岩体的颗粒速度分布，从微观层面发现岩体破坏的主要形式及破裂原因。

PFC2D numerical simulation of fractured rock mass deformation and rupture law under uniaxial loading

Using the discrete element software PFC2D to simulate the fractured rock mass, a 10cm×10cm model containing cracks with different angles, different groups, width of 5cm and thickness of 1mm is established, and the deformation and fracture rules of rock mass under uniaxial loading are analyzed. The results show that under uniaxial loading, the uniaxial compressive strength of rock mass decreases first and then increases with the increase of angle, and the cracks continue to increase. With the increase of cracks, the uniaxial compressive strength decreases gradually. The fracture zone of rock mass is concentrated at the tip of the crack, mainly including wing cracks, secondary coplanar cracks and secondary inclined twills. By analyzing the particle velocity distribution of rock mass after fracture, the forms and causes of rock mass failure are found from the micro level.