大跨小净距隧道合理开挖方法与支护参数对比研究  

Comparative Study of Rational Excavation Method and Support Parameter for Large-span Small-spacing Tunnel

作　　者：王更峰[1] 熊晓晖[1] 张永兴[1] 王桂林[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045

出　　处：《公路交通科技》2011年第3期101-107,共7页Journal of Highway and Transportation Research and Development

基　　金：黔科合重大专项字([2008]6013-04)

摘　　要：结合魁岐大跨小净距隧道工程实践,建立了大跨小净距隧道施工动态有限元分析程序,对不同围岩条件下隧道施工方案进行了数值模拟分析。分析中模拟了CRD法、双侧壁导坑法、弧形导坑预留核心土法、台阶法4种开挖方案,对拱顶下沉、水平收敛、地表沉降、中间岩柱应力和围岩稳定性等进行了对比分析,比选确定出不同围岩等级条件下大跨小净距隧道合理的开挖方法。同时,分析不同等级围岩,3种中岩柱支护参数对隧道围岩稳定性的影响。最后,通过分析隧道围岩位移、应变随净距的变化,确定隧道最小净距为0.55B是安全的。According to the construction conditions of Kuiqi large-span small-spacing tunnel,a finite element analysis program was established to simulate the tunnel construction process under the condition of various surrounding rocks.In the program,the cross diaphragm method,double-heading construction method,arc-heading reservation core soil method and benching tunneling method were simulated,and settlements of vault and ground,level convergence,stress of the interspace rock and stability of surrounding rock were analyzed and compared.Then the rational excavation methods of small-space tunnel with large-span under the condition of various grades of surrounding rock were compared and determined.And the effects of three middle rock pillar support parameters on surrounding rock stability were analyzed.Finally,by analysing the displacement and strain varying with spacing,it is found that the minimum safe spacing is 0.55B.

关 键 词：隧道工程 有限元分析 开挖方法 支护参数 安全净距 

分 类 号：U451[建筑科学—桥梁与隧道工程]