岩石爆破中塑性压剪损伤的数值模拟

为计算爆破导致的塑性压剪损伤，基于岩石微元强度分布的随机性，采用连续介质力学与损伤力学理论，建立一种岩石损伤软化统计本构模型，并将此模型合理地嵌入到大型有限元软件LS-DYNA中，对无限岩体中的球形和柱形药包爆破压剪损伤问题进行了数值模拟，获得了不同围压下的应力-应变关系数据和不同时刻损伤分布的资料。该模型本构参数少，能够较好地反映出介质的损伤与软化等特征。

Numerical Simulation on Blast-Induced Plastic Compression and Shear Damage in Rock Blasting

In order to well calculate the blast-induced plastic compression and shear damage, based on the randomicity of rock strength distribution of representative volume elements and the theory of continuum medium damage mechanics, a damage-softening statistical constitutive model is introduced and is then incorporated into the commercial FEM software, LS-DYNA. The compression and shear damage caused by the spherical and cylindrical explosions in infinite rock mass are numerically simulated. Information is obtained on the stress - strain relationship at different confining pressures and damage distribution at different times. This damage model of rock material with less constitutive parameters can favorably exhibit the characteristics of damage and softening.