地震荷载作用下大型地下洞室群的动态响应模拟

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。

Simulation on dynamic response of large underground opening complex under seismic loads

The dynamic response of a large underground opening complex under seismic loads was simulated by use of the softwore FLAC3D.Two different time-dependent acceleration curves were selected as the input seismic loads and the dynamic calculations were carried out respectively.The position and extent of splitting damage zones were predicted using the new splitting criteria.The distributions of stress field,displacement field and elastic energy in the surrounding rock mass were analyzed when the seismic loads were applied.It was shown that FLAC3D could be used to simulate the dynamic response of large underground opening complex under seismic loads effectively.The influence of seismic loads on the stability of the rock mass should be considered prudently in engineering.