外水压下隧道衬砌的力学响应及结构对策研究  

Research on mechanical response and structural countermeasure of tunnel lining under external water pressure

作　　者：丁浩[1,2] 蒋树屏[2] 杨林德[1] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]重庆交通科研设计院隧道工程所,重庆400067

出　　处：《岩土力学》2008年第10期2799-2804,共6页Rock and Soil Mechanics

基　　金：国家西部交通建设科技项目(No.200431800028);重庆市科技攻关项目(No.2005030007)资助

摘　　要：随着控制排放的隧道防排水技术的广泛应用,外水压力作用下隧道衬砌的一些设计技术问题也愈发突出。基于对外水压力下隧道衬砌的力学响应分析,以龙潭隧道和白云隧道为依托,通过数值仿真,研究了公路隧道抗水压衬砌的结构优化对策。研究结果表明:由于外水压力的作用,衬砌的边墙、仰拱隅角和仰拱处存在明显的应(内)力集中和突变现象,安全度大大降低;通过引入下半断面矢跨比的新概念,从技术和经济的双重角度,指出增大该指标是抗水压衬砌结构优化的首要对策;可依次或组合采用通过增大仰拱隅角处半径、减小仰拱处半径、增大仰拱拱圈厚度、增大衬砌全断面厚度等措施来作为抗水压衬砌的结构优化对策。With the widespread use of the waterproof and drainage technique of tunnel based on controlling drainage, some technical problems about tunnel lining design under external water pressure had been extruded more. According to construction examples of Longtan tunnel and Baiyun tunnel, optimization countermeasures about tunnel lining structure were studied against external water pressure by numerical simulation based on the mechanical response analysis of the lining under external water pressure. The study results showed there were increase stresses and internal forces on the side wall, the corn,~r of the invert arch of the tunnel lining and the safety degree reduced more under external water pressure; a new concept of rise span ratio of the half below the tunnel lining was introduced from technical and economical aspects, whose addition was the chief countermeasure to optimize the structure of lining against external water pressure; the optimization countermeasures of the lining against external water pressure were put forward, which included in turn increasing the radius of the corner on the invert arch, decreasing the radius on the invert arch, thickening the arch on the invert arch and the arch of all lining, or these countermeasures could be used assembled sometimes.

关 键 词：公路隧道 衬砌 外水压力 力学响应 矢跨比 结构对策 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]