基于PFC2D数值模拟的煤体裂隙演化规律研究

Study on evolution law of coal body fissure based on PFC2D numerical simulation

为了研究煤体裂隙演化规律,采用理论分析和数值模拟相结合的方法,理论分析了煤体延伸压力、裂隙延伸规律和裂隙延伸压力,得出研究工作面裂隙延伸和扩展以垂直方向位置为主,断层属于正断层类型,然后采用PFC 2D数值模拟,模拟分析了不同动压幅值下煤体裂隙演化规律和不同地应力下煤体裂隙演化规律。研究为煤层卸压增透提供了理论基础。

In order to study the evolution law of coal body fissure,the combination of theoretical analysis and numerical simulation is used to theoretically analyze the extension pressure of coal,the law of crack extension and the pressure of fracture extension,it is concluded that the fracture extension and extension of the study face are mainly in the vertical direction,the fault belongs to the normal fault type,and then the PFC 2D numerical simulation is used to simulate the evolution law of coal fissure under different dynamic pressure amplitude and the evolution law of coal fissure under different geostress.The study provides a theoretical basis for coal seam pressure relief and permeability enhancement.