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地下结构地震破坏过程模拟是研究地下结构抗震性能的有效手段,通过人工边界条件设置将围岩土体的自重应力作为动力响应模拟的初始状态,实现了地下结构地震响应静-动力耦合数值模拟。基于有限元分析软件ABAQUS,将极限剪应变作为破坏标准,采用生死单元法模拟了地下结构的地震破坏过程,通过结构埋深考虑了初始地应力对地下结构抗震性能的影响。模拟结果表明,地下结构的抗震性能存在一个最不利埋深,即最容易地震破坏的埋深,当结构的埋深超过最不利埋深时,结构的极限抗震能力增强,若结构产生地震破坏,则结构埋深越深即初始地应力越高其破坏程度也越强。
The seismic failure process simulation of underground structure is an effective method to study the seismic performance of underground structures. The gravity load of surrounding rock mass is set as the initial state of dynamic response simulation by artificial boundary conditions, and the numerical simulation of the seismic response of underground structures is realized. Based on the finite element analysis software ABAQUS, the ultimate shear strain is taken as the failure criterion. The life-and-death element method is used to simulate the earthquake damage process of the underground structure. The influence of the initial ground stress on the seismic performance of the underground structure is considered. The simulation results show that the seismic performance of the underground structure has one of the most unfavorable depths, that is, the depth at which the earthquake is most likely to be destroyed. When the depth of the structure exceeds the most unfavorable depth, the ultimate seismic capacity of the structure is enhanced. If the structure produces seismic damage, The deeper the structure depth is, the higher the initial stress is, the greater the damage is.