埋深对地下结构地震液化响应的影响

应用非线性液固两相体动力有限元方法研究饱和可液化土中地下结构在水平地震作用下埋深的响应。分析了地震液化情况下地下结构埋深对于结构上浮、加速度、水平位移以及响应结构内力的影响,讨论了非液化土中地铁地下结构地震响应随埋深的影响。结果表明,埋深的增加可以减少地铁地下结构由于土体液化所导致的结构上浮;同时,虽然地下结构地震作用所导致的内力随着埋深的增加有小幅度的上升,但由于深埋地铁地下结构的强度往往比浅埋的为高,因此在相同水平地震的作用下,浅埋地铁结构可能更加危险。

Effects of burial depth on the liquefaction response of underground structures during an earthquake excitation

The different seismic responses of underground structures in liquefiable soil at different burial depths were studied using the nonlinear coupled finite element method. The effects of burial depth on the uplift behavior, acceleration, lateral displacement, as well as the internal forces in the structure were analyzed. The relationship between burial depth and seismic behavior of underground structure in non-liquefiable soils was also investigated for comparison. The results show that the uplift of underground structures is reduced with increased burial depth, and although the internal forces induced by horizontal earthquake motion increase slightly with increasing burial depth, underground structures with larger burial depths may be safer due to their higher strength.