武汉地区地铁隧道非线性地震反应分析

NONLINEAR DYNAMIC ANALYSIS OF SOFT SOIL- DOUBLE TUNNELS MODEL IN WUHAN AREA

通过有限元模拟的方法进行了武汉地区软土—双隧道模型的动力非线性分析。在ABAQUS软件中建立了考虑软土动力非线性的二维土体—双隧道有限元模型,并通过在基岩位移输入SH波对该模型进行了动力非线性地震反应分析,主要研究了地表以及隧道上下两顶点位置的加速度与位移反应。通过对比分析,可以发现土层及注浆加固区能有效降低衬砌的加速度与位移反应;在SH波作用下衬砌上下两顶点将发生相对侧移,并呈椭圆形。

The nonlinear dynamic analysis of soft soil-double tunnels model in Wuhan area is conducted by finite element simulation . Considering dynamic nonlinearity of soft soil, two-dimensional finite element model of soil-double tunnels is established in ABAQUS, and the nonlinear seismic response analysis of this model is performed with a SH wave input at the bottom. The acceleration and dis-placement response on the earth surface and top/bottom vertex of tunnel is studied. It can be found that the soil and grouting reinforce-ment area can effectively reduce the acceleration and displacement response of the lining. The relatively lateral displacement will occur at the top and bottom vertices of the lining under SH wave.