层理对岩石抗压强度影响研究

Exploration of the anisotropic mechanical of shale

页岩作为页岩气的主要聚集岩层,由于其具有薄页状的层理,使得页岩与其它常规储层岩石力学性质显著不同,具有明显的各向异性特征。依然假定页岩为各向同性岩体,必然会产生不可避免的错误,在现场工作中造成不必要的损失。本文对不同层理倾角页岩进行单轴和三轴压缩实验获得力学参数,研究页岩的各向异性强度特征以及变形各向异性特征。由于离散元理论适用于不连续岩石的特点,利用离散元软件PFC2D对含有层理页岩进行数值模拟研究,实现对页岩力学参数的确定,从而研究不同角度下含有单一层理和含有一组层理页岩的抗压强度。

Shale which is the set of rock of shale gas is obviously anisotropic different from conventional reservoir rock, since it has thin page of bedding. It must cause unnecessary loss in the actually work if still assumes that shale is isotropic. In this paper the anisotropy of shale strength and deformation is studied base on the mechanical of rock of different angle of bedding which are obtained through the uniaxial and triaxial compression test. The anisotropy of shale of single bedding and a group of bedding is studied. The mechanical of shale is simulated by discrete element software PFC2D.