地铁区间平行隧道开挖面距离对地表沉降影响研究

Study on influence of excavation surface distance on surface subsidence of parallel tunnel in subway

以兰州地铁区间隧道为工程背景,用GTS-NX软件对施工过程进行数值模拟,分析了双孔平行隧道开挖对地表沉降的影响。结果表明:纵向监测点竖向位移分为四个变化阶段,左洞超前右洞15 m时,横向监测点竖向位移分布不是沿两隧道中线呈对称分布,对施工中如何去控制地表沉降具有参考意义。

In this paper, the Lanzhou subway tunnel is used as the engineering background, and the GTS-NX software is used to simulate the con-struction process. The two-hole parallel tunnel is analyzed by using the GTS-NX software analyzes influence of excavation on surface subsidence, the results show that the vertical displacement of the longitudinal monitoring points is divided into four stages, when the left hole is advanced by 15 m, the vertical displacement distribution of the transverse monitoring point is not symmetrical along the middle line of the two tunnels. It has reference and guidance to how to control the surface settlement in the construction.