裂隙岩石抗压强度和裂纹扩展的数值模拟

Numerical Simulation of Compressive Strength and Crack Propagation of Fractured Rock

摘要: 岩土工程中，天然裂隙的展布和形态对其破裂性质具有重要影响。本文利用离散元颗粒流数值模拟软件(PFC^2D)详细研究了压力试验汇中的岩石抗压强度及裂纹扩展规律。通过建立无裂隙、0˚倾角裂隙、30˚倾角裂隙、60˚倾角裂隙、90˚倾角裂隙五个岩石试样模型，分别实施单轴压缩试验并观察模型内的裂纹产生及扩展情况。结果表明，无裂隙岩石试样模型抗压强度大于有裂隙的岩石试样模型；裂隙倾角将明显影响岩石试样模型的抗压强度、扩展能力和裂纹数量。

Abstract: In geotechnical engineering, the distribution and morphology of natural fractures have an im-portant influence on their fracture properties. In this paper, the rock compressive strength and crack propagation law in the pressure test pool are studied in detail by using the discrete element particle flow numerical simulation software (PFC^2D). By establishing five rock sample models without cracks, 0˚ dip angle cracks, 30˚ dip angle cracks, 60˚ dip angle cracks, and 90˚ dip angle cracks, uniaxial compression tests were performed to observe the crack generation and propaga-tion in the model. The results show that the compressive strength of the rock sample model without cracks is greater than that of the rock sample model with cracks. The fracture dip angle will significantly affect the compressive strength, propagation ability and crack number of the rock sample model.