黑龙江交通科技

针对砂卵石地层暗挖地铁隧道施工易引发地表沉降变形、影响市政管道安全的问题，基于现场监测和数值模拟分析砂卵石地层暗挖地铁隧道施工沉降特征，对比先后开挖和同步开挖两种方式沉降差。研究表明：（1）依托工程地铁隧道下穿市政管道最大沉降变形符合控制标准，满足开挖要求。（2）受先后开挖影响，市政管道沉降变形存在两个阶段，开挖导致的地表沉降在横向断面上的趋势为凹形，近似正态分布。（3）双线隧道同步开挖时，沉降变形曲线呈对称分布，虽存在沉降叠加效应，但总沉降量小于分步开挖。

Due to the fact that the underground excavation of subway tunnels in sandy gravel strata is prone to cause significant surface settlement deformation, which affects the safety of municipal pipelines, based on on-site monitoring and numerical simulation, the settlement characteristics of underground subway tunnel construction in sandy gravel strata were analyzed. The settlement differences between the sequential excavation and simultaneous excavation methods were compared. The research shows:(1) The maximum settlement deformation of the subway tunnel under passing municipal pipelines complies with the control standards and meets the excavation requirements.(2) Due to the sequential excavation, the settlement deformation of the municipal pipeline has two stages. The surface settlement caused by the excavation has a trend of concave shape in the horizontal section, approximately following a normal distribution.(3) When the double-line tunnel is excavated simultaneously, the settlement deformation curve shows a symmetrical distribution. Although there is a settlement superposition effect, the total settlement is less than that of the step-by-step excavation.