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应用离散元方法,分别研究了断裂刚度、内摩擦角、内聚力和几何形态等对其附近地应力场的影响。结果表明:这些因素对断裂附近的地应力场均有不同程度的影响,能造成主应力方位和量值发生变化;这种变化主要限于断裂附近一定距离内,远离断裂,逐渐趋于与区域应力场一致;断层附近应力方位变化的幅度和发生变化的范围,是因断层的力学性质及几何形态等的不同而不同。认为断层的内摩擦角(φ)对断层附近应力方位变化的范围和幅度影响最大。
Discrete element method is applied to study the influence of fracture stiffness, internal friction angle, cohesion and geometry on the geo-stress field nearby. The results show that these factors have different degrees of influence on the ground stress field near the fault, which can cause the change of orientation and magnitude of the principal stress. These changes are mainly confined to a certain distance near the fault, far away from the fault and gradually converging with the regional stress The range of the change of stress azimuth and the range of change near the fault are different due to the different mechanical properties and geometry of the fault. It is considered that the internal friction angle (φ) of the fault has the greatest influence on the range and amplitude of the stress azimuth change near the fault.