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将爆破损伤视为爆破应力波和爆生气体压力共同作用的结果,分别考虑不同的地应力条件(侧压力系数0.5、1和2,竖直方向地应力5 MPa和10 MPa)和节理角度(30°、45°、60°和90°),开展含节理岩体双孔爆破过程的数值模拟,研究爆生裂纹萌生—扩展—贯通过程的演化规律.无节理时,初始应力场对爆生裂纹的扩展具有一定的导向作用,裂纹扩展主方向趋于最大地应力方向.节理对裂纹的扩展方向具有一定的影响,节理角度为30°时,爆生裂纹与节理面连通,形成典型的“之”字形断裂.节理对裂纹萌生和扩展具有明显的促进作用,有利于孔壁上下侧裂纹沿竖直方向的扩展.
The blasting damage is regarded as the result of the combined effect of blasting stress wave and gas explosion pressure. The effects of different in-situ stress conditions (lateral pressure coefficients 0.5, 1 and 2, vertical stress 5 MPa and 10 MPa) and joint angles 30 °, 45 °, 60 ° and 90 °), the numerical simulation of two-hole blasting process with jointed rock mass was carried out to study the evolution of crack initiation-propagation-through process. The crack propagation has a certain guiding role, and the main direction of crack propagation tends to the maximum stress direction. The joint has some influence on the crack propagation direction. When the joint angle is 30 °, The fractures of the “zigzag” fractures, the joints promote obviously the initiation and propagation of the cracks, which is conducive to the vertical expansion of the cracks on the upper and lower sides of the wall.