盾构隧道开挖对既有管线及地表的影响分析

城市地铁在建设时不可避免地会影响地下管线的正常使用。对某黄土地区地铁施工过程进行研究，针对以往将土舱压力等效为均布荷载的不足，重点分析将其等效为梯度荷载时地铁隧道开挖对地下管线及地表的影响。结果表明：(1)在地下管线众多影响因素中，埋深的影响最大；(2)地表沉降与管线弹模成反比；(3)管线沉降曲线变化规律符合Peck曲线。研究结果对工程实际起到一定的指导作用。

Analysis of Impact of Shield Tunnel Excavation on Pipeline and Surface

Building city subway will inevitably affect the normal use of underground pipelines. This paper studies a process of subway construction in loess area. In view of the shortage of equivalent the soil compartment pressure to uniform load in the past, this paper analyzes the subway tunnel excavation to underground pipelines and surface effects when it is equivalent to the gradient load. The results show that:(1) Among a number of factors in the underground pipeline, the depth is of the greatest impact;(2) Surface subsidence and elastic modulus of the pipeline are inversely proportional;(3) Pipeline settlement curve variation curves meet Peck. The results may play a guiding role in the actual projects.