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经典Ｗｅｉｂｕｌ统计断裂理论从统计的角度建立了拉剪应力条件下裂纹扩展的统计断裂模型。而岩体工程中的断续节理岩体的裂纹有相当一部分是处于压剪应力作用下，应用经典Ｗｅｉｂｕｌ统计断裂理论建立的裂纹扩展概率模型是不适宜的。本文对断续节理岩体中压剪应力条件下裂纹扩展的随机性从断裂力学角度进行了研究，建立了压剪应力条件下裂纹的断裂力学概率模型，并讨论了节理岩体的失效概率与裂纹几何、力学各参数之间的关系。
The classic Weibul statistical fracture theory establishes a statistical fracture model of crack propagation under tensile and shear stress from a statistical point of view. In the rock mass engineering, a certain part of the cracks of the intermittent jointed rock mass is under the action of compressive shear stress. It is not appropriate to apply the crack growth probability model established by the classic Weibul statistical fracture theory. In this paper, the randomness of crack propagation under intermittent compressive stress in intermittent jointed rock masses is studied from the point of view of fracture mechanics. A fracture mechanics probability model for cracks under compressive shear stress conditions is established, and the failure probability of jointed rock masses is discussed. The relationship between crack geometry and mechanics parameters.