分层煤层开采压裂优化计算模型

Optimization calculation model of fracturing in slicing coal seam

在选择煤层压裂参数和开采布置存在不确定性的问题,通过最大拉应力理论的断裂失效准则,得到多分层煤层压裂的计算模型。在煤层为均质、连续、各项同性的地质体下,每层的起裂压力与煤层埋深为线性递增关系,和理论计算的变换规律一致。通过对煤层结构和应力场特点分析,明确注水压力计算方法,在轴向上主要受到最弱层理面,在径向上主要影响最小抗拉强度和垂直侧向应力系数。

The uncertainty of choosing fracturing parameters and mining arrangement in coal seam,Through the fracture failure criterion of the maximum tensile stress theory,the calculation model of multi layered coal seam fracturing is obtained.n the geological body with homogeneous,continuous and isotropic coal seam,the fracturing pressure of each layer is linearly increasing with the depth of coal seam,which is consistent with the transformation rule of theoretical calculation.Based on the coal seam structure and characteristics of stress field analysis,clear water pressure calculation method in the axial direction is mainly affected by the weakest bedding surface in the radial direction,mainly affects the minimum tensile strength and vertical lateral stress coefficient.