基于PFC3D的岩体中不整合面构建方法研究

Research on Simulation Method of Unconformity Surface in Rock Mass Based on PFC3D

为了对地下岩土体进行精确建模,考虑到岩层之间的不整合面对模拟的影响,提出使用基于颗粒流理论的PFC3D模拟岩体中不同岩层接触情况的方法,包括:整合、平行不整合、角度不整合的接触情况。模型构造步骤包括:定义岩体坐标系,确定接触面走向的关键坐标点,使用MATLAB拟合这些走向曲线并得到曲线参数,使用下落法构造岩层,使用FISH根据走向曲线参数形成接触面。构建后的模型满足上述要求,证明了与实际岩体力学性能是接近的。该方法可为考虑岩层接触面的建模提供一种有效途径。

In order to accurately simulate the rock mass, considering the effects of the unconformity to simulation, the method was purposed to simulate the different contact situation using PFC3 D based on the Particle flow theory, include: integration, parallel unconformity, angular unconformity. Simulation step include: define the rock coordinate system; determine the key points of contact trend; use MATLAB to fit the trend curve and get the parameters; use PFM to construct the model; shaping contact surface using FISH according the parameters. The structured model satisfies the above requirements, which proved the model is close to the actual rock mass mechanics performance.