摘要
连拱隧道在线路平面、洞口位置选择上均较分幅修建隧道优越,其所占比例也越来越大。而按照我国公路隧道设计规范设计连拱隧道时,常将围岩和支护结构隔离开来,分析结果不能完全反映施工过程的实际情况,故有必要对连拱隧道施工方案进行优化分析。针对龙山隧道具有浅埋、大跨度、连拱的特点,建立了连拱隧道施工动态有限元分析程序,模拟三导洞法和上下台阶法开挖双连拱隧道的施工过程,并通过对拱顶沉降、地表沉降、中墙应力、围岩稳定性的分析,从施工工序与施工力学角度对2种施工方法的优劣进行比较分析,从而使得实际隧道施工方案得到优化。
With the merits in road line and entrance location choosing, the proportion of twin tunnel is bigger and bigger compared with separated two single tunnels. According to the code for design of road tunnel, the tunnel＇s surrounding rock from supports in calculating for tunnel designing is separated; and the calculated results can＇t reflect construction stages reasonably. So it is necessary to make optimal analysis of construction schemes for twin tunnel. Considering the characteristics such as shallow, large span and double-arch of Longshan tunnel, a finite element analysis program for twin tunnel is established which can simulate the construction process under the three-pilot drift method and benching tunneling method; and the settlement of vault and ground, stress of the middle wall and the stability of the surrounding rock are compared and analyzed; then the advantages of the two methods are compared so as to optimize the practical construction scheme.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第22期4042-4047,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
西部交通建设科技项目(2002–318–000–22)
上海市自然科学基金资助项目(04ZR14135)
关键词
隧道工程
连拱隧道
三导洞法
上下台阶法
施工力学
tunneling engineering
twin tunnel, three-pilot drift method
benching tunneling method
construction mechanics
