基坑开挖对邻近地铁隧道轨道变形影响分析

Analysis on Influence of Foundation Pit Excavation on Track Deformation of Adjacent Subway Tunnel

为研究基坑开挖对邻近地铁轨道的变形影响,以合肥地铁3号线附近的某小区基坑为研究对象,采用Midas GTS有限元软件对工程进行三维模拟,验证了抗拔桩可以有效减少轨道侧移并且发现在进行基坑开挖时,轨道水平向有较大影响而竖向无影响;轨道的沉降是隧道轨道水平向侧移的0.384倍;在开挖过程中,轨道侧移最大的位置并不是出现在与基坑最近的位置,而是出现在离基坑北侧水平距离15.6 m的位置.

For the purpose of studying the influence of excavation on the deformation of adjacent subway track,a small area near Hefei Metro Line 3 is taken as study object,and the Midas GTS finite element software is used to simulate the project in three dimensions.It is proved that the uplift pile can effectively reduce the lateral movement of the track,and it is found that the horizontal direction of the track has great influence and the vertical direction has no effect when excavation is carried out.It is also concluded that the settlement of the track is 0.384 times the horizontal lateral shift of the tunnel track.At the same time,during the excavation,the position where the track side moves the largest is not in the nearest position to the foundation pit,but in the position where the horizontal distance from the north side of the foundation pit is 15.6 meters.