单临空面岩体中爆破诱发损伤的数值分析

岩石的抗压强度远大于其抗拉强度，所以在单临空面岩体爆破中，工程技术人员关注的不仅是炮孔附近的塑性压剪损伤，更多的是临空面附近的拉裂损伤，临空面若是地表，可能会影响到施工的安全，甚至造成一定的经济损失。以往这类损伤问题的数值模拟中大多只偏向于一方面：或忽略压剪损伤，或不考虑拉裂损伤，故所得出的结论难以满足工程需要。基于合理的应力修正方式，把现有的岩石拉-压损伤本构以简明的方式嵌入到大型LS-DYNA软件中，对单临空面岩体中的柱形和球形药包爆破问题进行了数值模拟，计算结果表明该法能较好地预测岩体中爆破诱发的拉裂、压缩损伤的分布规律和演化趋势。

Numerical analysis of blast-induced damage in rock mass with single free-face

Rock mass has much higher compressive strength than tensile strength, so engineers concern about not only plastic compressive-shear damage around charge hole but also tensile damage near the free-face when blast occurs in rock with a single free-face. These damages may touch upon construction safety and even property loss if the free-face is just ground surface. Previous researches ignore either compressive-shear damage or tensile damage, thus the conclusions drawn are difficult to meet the needs of engineering. Based on reasonable modes of stress revision, this paper incorporates an existing damage constitutive model which can separately consider tensile damage and compressive-shear damage into the commercial FEM software, LS-DYNA. Cylindrical and spherical explosions in rock mass with a single free-face are then numerically simulated. The results show that this method can well predict the distribution and evolution of blast-induced compressive and tensile damages.