双洞隧道洞口段抗减震模型试验研究  

Aseismic and seism-reducing modeling study for entrance of two-track tunnels

作　　者：孙铁成[1,2] 高波[1] 王峥峥[1] 

机构地区：[1]西南交通大学土木学院,成都610031 [2]石家庄铁道学院土木学院,石家庄050043

出　　处：《岩土力学》2009年第7期2021-2026,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金项目(No50878187);中国博士后基金资助项目(No20080431267)

摘　　要：为了解隧道衬砌在地震过程中的动态响应以及减震层在地震过程中对隧道及围岩边坡安全性能的影响,针对双洞隧道洞口段进行室内抗减震模型试验研究。模型试验按有(无)减震层分成2组进行对比。试验结果表明:(1)设置减震层对围岩破坏的形式没有影响,只能在破坏程度上有所减轻;(2)减震层的设置对模型中的动应力分布情况有较大影响,并能够在一定程度上减小作用在衬砌上的作用力;(3)有错距的双洞隧道中,长里程隧道洞身在包含短里程隧道洞口的横截平面附近受力状态复杂,减震层的加入有利于减轻其破坏程度。An aseismic modeling test of the entrance of two-track tunnels is carried out in laboratory, in order to learn about the dynamic response of tunnel-liner and the effect of seism-reducing layer on tunnel-liner security and rock-slope stability during earthquakes. In this modeling test, two cases with and without seism-reducing layer respectively, are executed to analyze the behaviors of seism-reducing layer. The measured results show that： （1） the seism-reducing layer can reduce the destruction degree of surrounding rock, exhibiting no effect on their destruction mode; （2） the seism-reducing layer exerts more effect on the stress distribution under earthquake action and diminishes the force loaded on tunnel liner to some extent; （3） for the tunnel entrance with unequal mileage, the tunnel-liner of long mileage tunnel is sustained more complicated stresses around the cross-section containing the tunnel entrance with short mileage, and the seism-reducing layer is able to relieve the destruction degree of tunnel-liner near that cross-section effectively.

关 键 词：双洞隧道 地震 减震层 动态模型试验 

分 类 号：U456[建筑科学—桥梁与隧道工程]