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考虑岩石介质的非均匀性,把爆破过程视为爆炸应力波和爆生气体压力共同作用的结果,基于损伤力学理论建立了岩石爆破的力学模型,并对不同地应力条件下岩石双孔爆破裂纹演化规律进行了数值模拟,分析了不同侧压力系数和埋深对裂纹扩展规律的影响。数值模拟结果表明:①爆炸应力波导致裂纹的萌生,爆生气体压力则会使裂纹进一步扩展和贯通;②裂纹演化过程与地应力密切相关,裂纹扩展的主方向趋于最大地应力方向;③随着埋深增加和初始地应力增大,裂纹扩展半径和裂纹区面积减小,地应力对爆破致裂的抑制作用明显。
Considering the heterogeneity of rock medium, the blasting process is regarded as the result of the joint action of blasting stress wave and blasting gas pressure. Based on the damage mechanics theory, the mechanical model of rock blasting is established. Evolution of the numerical simulation, analysis of the different side pressure coefficient and depth of the crack propagation law. The results of numerical simulation show that: (1) the explosion stress wave causes the initiation of the crack, and the gas pressure of the exogene will further expand and penetrate the crack; (2) the evolution of the crack is closely related to the earth stress, and the main direction of the crack propagation tends to the maximum stress direction; With the increase of burial depth and the increase of initial stress, the crack propagation radius and the area of the crack zone decrease, and the restraining effect of the ground stress on the crack initiation is obvious.