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利用FLAC3D软件模拟了地震荷载作用下某地下洞室群围岩的动态响应。对2种工况的地震荷载作用进行了动力计算。采用新的劈裂破坏判据对震后可能出现的劈裂损伤区范围进行了预测。详细分析了围岩内应力场、位移场分布以及能量变化的情况,并与震前进行对比。分析结果表明:FLAC3D软件用于地震荷载作用下地下洞室群动态响应的数值模拟是可行的,工程上应慎重考虑地震荷载的影响。
Using FLAC3D software to simulate the dynamic response of surrounding rock mass of an underground cavern group under earthquake load. The dynamic loads of two kinds of working conditions are calculated. The new splitting failure criterion is used to predict the possible range of splitting damage after earthquake. The stress field, displacement field distribution and energy change in surrounding rock are analyzed in detail, and compared with pre-earthquake. The analysis results show that it is feasible to use FLAC3D software to simulate the dynamic response of underground caverns under seismic load. The impact of earthquake load should be carefully considered in engineering.