单柱双联拱地铁隧道地表沉降分析

Analysis of ground surface settlement based on single solumn-double arched subway tunnel construction

地铁隧道施工阶段及施工后期诱发的地表沉降是造成各种建、构筑物产生外观及功能上损害的主要原因,因此,研究由浅埋暗挖施工引起的地表沉降问题具有重要意义。以某地铁车站暗挖工程为研究背景,采用FLAC3D数值分析的方法,对该地区浅埋暗挖施工引起的单柱双联拱地铁隧道地表沉降进行了数值模拟,同时分析了隧道变形的实测数据及施工工序对沉降的影响。研究表明:中洞开挖引起的沉降较快,而由于中柱支撑侧洞开挖引起的沉降较慢,在施工过程中应当引起注意。该研究为工程的顺利实施提供了依据和指导,可供类似工程参考。

Ground surface settlement during and after the tunnel construction phase results in damage to both the appearance and function of the various kinds of buildings. The study on the effect of ground surface settlement, depending on shallow buried covered excavation method during subway construction is of greater importance. Based on the engineering background of the station, the paper introduces the application of numerical simulation by FLAC3D to study on the ground surface settlement of single column-double arched tunnel due to underground excavation method and analysis of the observation data and settlement im- pact of construction program, consistent with those of numerical simulation. This paper highlights the ground surface settlement law ： excavation of central pilots results in faster settlements than that of the lateral pilots. The slower settlement due to centeral column support lateral pilots involves a greater attention in the process of construction. The study provides references for the project and other similar projects.