3D polycrystalline discrete element method (3PDEM) for simulation of crack initiation and propagation in granular rock

A three-dimensional Voronoi tessellation model based on the distinct element method (DEM) is proposed to model the representative part of the microstructures of granular brittle rocks. Regularization is employed to decrease the frequency of polyhedrons with large edge ratio and contributes to a higher efficiency for element meshing. Sensitivity analyses are performed for a series of micro contact parameters in accordance with the macro responses observed in laboratory experiments (e.g. the uniaxial compression test, the Brazilian disc test and the triaxial compression test). Verifications by simulating the spalling test and plate impact test indicate that the 3D polycrystalline discrete element method (3PDEM) can be employed for efficiently simulating nonlinear mechanical behaviors, large deformation, strain softening and rock dynamics.     

压剪应力条件下各向异性岩石损伤本构模型和渗流模型(Ⅱ)：三轴压缩应力状态下理论模型及算例

在文[1]的基础上，推导了所建立本构模型和渗流模型的三轴压缩情况下的方程，并给出了1个算例。结果表明，建立的本构模型能够反映微裂纹闭合摩擦滑移、微裂纹发生自相似扩展和微裂纹发生弯折扩展对变形的影响；建立的本构模型能够反映岩石剪胀特征；弯折微裂纹分支张开是使岩石渗流明显地增大原因