论文部分内容阅读
重庆市机场立交改造工程中的A匝道是一条重要的匝道,其顶部紧接机场高速路面结构,底板下部为轨道三号线区间隧道,两者间围岩净距不足3 m。区间隧道与机场高速路为上下平行关系,A匝道与它们呈75°左右夹角。为了评价A匝道明挖隧道施工对轨道交通隧道安全运营的影响,A匝道采用了筏板基础和桩基础两种基础形式进行了比选,采用ANSYS软件对A匝道的施工过程进行了三维数值模拟分析。计算结果表明,两种基础结构型式对轨道隧道的影响基本相同,同时,A匝道施工对轨道隧道结构及轨道梁的影响也很小,不会影响其安全运营。
A ramp in Chongqing Airport Interchange Reconstruction Project is an important ramp, with the top of the ramp on the airport and the lower part of the basement being the track-3 tunnel. The clearance between the two is less than 3 m. Interval tunnel and the airport highway up and down parallel relationship, A ramp and they were about 75 ° angle. In order to evaluate the impact of A ramp excavation on the safe operation of the rail transit tunnel, A ramp was compared with two basic forms of raft foundation and pile foundation. The ANSYS software was used to carry out three-dimensional numerical simulation of A ramp. analysis. The calculation results show that the influence of two kinds of foundation structures on the track tunnels is basically the same, meanwhile, the influence of the A ramp construction on the track tunnel structure and the track beam is also small, which will not affect the safe operation of the track tunnel.