地铁盾构隧道地震反应分析

Seismic response analysis of shielded subway tunnels

为研究地铁盾构隧道的地震反应特性,采用复反应分析法研究了并行隧道间距离、衬砌厚度、材料性质等因素对地震反应的影响。研究结果表明:距离较小时,并行隧道的地震反应相对于单一隧道情形会发生较大变化;衬砌材料弹性模量的变化对盾构隧道的地震反应影响不大;衬砌厚度的变化对隧道地震变形反应的影响也不大,但对内力反应的影响显著。研究结果还显示,相对于设计基本地震加速度,把地面与基岩间峰值相对位移作为地下结构的设计地震动参数更为合理。

The complex response method was used to analyze the seismic response of subway tunnels shielded with a stiff liner as a function of factors such as the distance between the twin tunnels and the elastic modulus and thickness of the lining. The numerical results show that the seismic response of closely spaced twin tunnels is significantly different from that of a single tunnel. The elastic modulus of the lining has little effect on the seismic response. The lining thickness has little influence on the seismic deformation response, but great influences the internal force response. The peak ground displacement relative to the bedrock is a more effective design parameter of ground motion than the ground motion acceleration for evaluating the seismic response of underground structures.