摘要
Abstract
In this paper,a large cross-section tunnel is taken as the research object,and the influence of supporting and construction parame-ters on the tunnel lateral settlement,longitudinal settlement and vault settlement is simulated and analyzed by constructing a three-dimensional finite model.The results show that from left to right,as the distance from the tunnel center decreases first and then increases,the surface later-al settlement increases first and then decreases,and the surface settlement at the tunnel center is the largest.The longitudinal settlement of the surface gradually increases with the advance of excavation and then tends to be stable.The cumulative settlement of the tunnel arch is relatively stable at the initial stage of excavation.With the further excavation of each guide tunnel,the cumulative settlement of the tunnel arch first in-creases rapidly and then becomes stable.To sum up,the earlier the initial support is carried out after tunnel excavation,the more obvious the support effect is,the more it can restrain the ground settlement and tunnel deformation.关键词
浅埋暗挖/大断面/双侧壁导坑/数值模拟/地表沉降量Key words
Shallow excavation/Large section/Double sidewall heading/Numerical simulation/Land surface settlement分类
交通工程
