结合连续介质力学和动力非线性有限元理论知识，通过ANSYS/LS-DYNA建立20 m水深和无水两种情况下的钻孔爆破模型，采用多物质ALE算法，模拟得出了从孔底起爆时爆炸冲击波引起的应力响应，并根据岩石破碎机理判断出粉碎区、裂隙区和弹性振动区，在5~8倍的药柱半径范围内，由冲击波压碎岩石形成粉碎区，临界径向压应力为207 MPa左右，在10~14倍的药柱半径范围内，岩石被割裂形成裂隙区，且切向拉应力起主导作用，其临界值为16.1 MPa左右，对比分析两种模型的计算结果可知，水介质的存在会减缓冲击波与爆轰气体的衰减速率。%Combining with the principles of continuum mechanics with dynamical nonlinear finite element theo-ry,the ANSYS/LS-DYNA was used to build the drilling blast model with 20 m deep water and without water,by u-sing the method of multi-material Arbitrary Lagrange Eulerian finite. The stress response caused by explosive shock wave from the bottom initiation was simulated,which determined the crushing zone,fissure zone and elastic vibration zone by the rock-cracking mechanism. Furthermore,within 5 to 8 times of the radius of charge,the rock was crushed by shock wave and the critical radial compressive stress was about 207 MPa;within 10 to 14 times of the radius of charge,the rock was torn and the fissure zone came into being,where the tangential tensile stress played a leading role and critical value was about 16. 1 MPa. Results showed that the water decreased the decay rate of stress wave and detonation wave.
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