高烈度地震对填方隧道影响分析

Analysis of Influence Factors on High Intensity Seismic Response of the Tunnel Through the Fill Area

本文以某隧道工程为实例,以数值模拟方法为手段,建立了隧道地震动力分析模型,对高烈度地震区施加地震荷载,对填方地基修建的隧道结构进行动力响应特征研究,探讨隧道不同衬砌厚度、覆土厚度及覆土形式等参数对隧道衬砌结构受力状态的影响。研究结果表明:在地震荷载作用下,衬砌厚度和覆土厚度对隧道各部位弯矩荷载值及剪力荷载值影响较大,特别是在衬砌底板与中墙连接部位影响显著;对于隧道上部的回填覆土,应尽量避免单侧覆土,必要时增加水平支撑改善隧道受力状态。

The dynamic analysis model of a tunnel project was established in order to study the characteristics of the seismic response in the high intensity earthquake zone by using the numerical simulation method in this paper. Meanwhile,the influences of the thickness of the lining,the thickness and form of the covering soil on the stress state of tunnel structure were discussed. The results showed that the thickness of the lining and the thickness of the covering soil had a significant influence on the bending moment and the shear load of each part of the tunnel,especially in the connection part of the lining plate and the middle wall. In addition,it was possible to avoid the soil covered in one side or increase the support to improve the stress state of the tunnel.