反应位移法在盾构隧道横向抗震研究中的应用

Application of reaction displacement method in lateral seismic study of shield tunnel

反应位移法作为地下结构抗震设计的简化方案之一,近年来越来越多地用到了地下结构抗震计算中,从反应位移法算法原理出发,运用PROSHAKE频域分析软件以及ABAQUS有限元软件,对广东省某盾构隧道地震响应进行研究,对比了反应位移法与动力时程法在计算地下结构内力时的差异,发现反应位移法可以较为准确地反映周围土层对地下结构的约束作用,并且在同种地震动输入条件下,反应位移法能够较好地与动力时程法吻合。

Reactive displacement method is one of the simplified schemes for seismic design of underground structures. In recent years,this method has been increasingly used in seismic calculation of underground structures. The seismic response of a shield tunnel was studied in Guangdong Province based on the principle of reactive displacement algorithm with PROSHAKE frequency domain analysis software and ABAQUS finite element software. The difference between the reaction displacement method and the dynamic time history method in calculating the internal force of the underground structure was compared. It is found that the reaction displacement method can accurately reflect the constraint effect of the surrounding soil layer on the underground structure. The reaction displacement method can be well matched with the dynamic time history method under the same ground motion input conditions.