关键词: 岩体破裂, 数值试验, 水力压裂, 非对称性, 孔隙压, 梯度分布

Abstract: By using numerically testing method, hydrofracturing in anisotropic pore pressure fields was studied. The simulated results indicate that the macroscopic failure evolution process was induced by microscopic fracture under pore pressure, which agreed well with the experimental results. It is found that the fracture is influenced by both pore pressure magnitudes on a local scale around the crack tip and by the orientation and distribution of pore pressure gradients on a global scale. The fractures always propagate towards the regions of higher local pore pressure and fracture pressure decreases with the increasing of local pore pressure. The research may be applied to control the hydraulic fracture orientation in the field.