交错既有隧道次生力学效应三维模型试验  

Three-dimensional model test for secondary mechanical effect of existing forked tunnel with different altitudes

作　　者：刘新荣[1,2] 郭子红[1,2,3] 裴丽[1] 王吉明[1] 林志[4] 王芳其[4] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045 [3]四川农业大学城乡建设学院,四川都江堰611830 [4]重庆交通科研设计院,重庆400067

出　　处：《岩土力学》2011年第9期2609-2616,共8页Rock and Soil Mechanics

基　　金：国家863计划项目(No.2007AA11Z110);国家自然科学基金创新群体基金(No.50621403)

摘　　要：为分析交错新建隧道施工对既有隧道的影响,采用公路隧道结构与围岩综合试验系统对交错隧道进行三维物理模型试验。测试的内容包括新建隧道开挖引起既有隧道围岩内部压应力、围岩内部位移及支护结构内力的变化规律。试验结果表明,既有隧道拱顶径向压应力和拱腰切向压应力具有增加趋势,拱顶切向压应力和拱腰径向压应力具有减小趋势;拱顶围岩内部位移表现为压缩变形,拱腰围岩内部位移为拉伸变形;既有隧道支护结构的轴力和弯矩全为增加,右拱腰的弯矩受到的影响最大;新建隧道施工对既有隧道L8截面的影响较小,对L1和L4截面的影响非常明显,当间距小于L8截面情况时应采取加固措施。Based on system for structure and surrounding rockmass of highway tunnel,a three-dimensional model tests about forked tunnel with different altitudes were carried out to study the influence of construction of new forked tunnel with different altitudes on existing tunnel.Existing tunnel＇s internal forces of supporting structure,surrouding rockmass internal pressure and internal displacements induced by constructing new tunnel,were measured.Testing data show as follows.Existing tunnel＇s crown radial stress and hance tangential stress are keeping increasing,and crown tangential stress and hance radial stress are keeping decreasing.Surrounding rockmass internal displacements are compression deformation at crown and tensile deformation at hance.Existing tunnel＇s axial forces and bonding moments of supporting structure keep increasing;and right hance moment of supporting structure increased most obviously.Constructing new tunnel has bad influence on existing tunnel＇s section L1 and L4,and has little influence on existing tunnel＇s section L8.The area in which adjacent spacing is less than section L8 should be strengthened.

关 键 词：交错隧道 次生力学效应 模型试验 既有隧道 

分 类 号：U451[建筑科学—桥梁与隧道工程]