复杂空间关系大断面多隧道建设沉降控制研究

Study on Settlement Control of Large Cross-section Multi-tunnel Construction with Complex Spatial Relationship

通过对太平山隧道现场监测结果,对施工中拱顶沉降规律进行了研究。研究发现太平山隧道拱顶下沉速度随着施工时间的持续快速减缓,施工当天左侧拱顶测点的最大下沉速度为5.2 mm/d,,距离开挖10 d左右,拱顶的下沉速度几乎为零。太平山隧道拱顶沉降规律最适合用指数函数表示,拟合结果显示拱顶沉降的最终收敛值约为13.7 mm。太平山隧道的施工对上部既有金丽温高铁隧道几乎不产生沉降影响。此外,为减少下部隧道开挖及衬砌施工过程中产生的沉降,给出了相应的措施。

The article studies the settlement rule of vault in the construction according to the field monitoring result of Taiping Mountain Tunnel. The study results show that the vault settlement speed of Taiping Mountain Tunnel slows down quickly as the construction continues, the maximum settlement speed at the measuring point of left vault is 5.2 mm/d on the same day of construction about 10 d from excavation, and the settlement speed of vault is almost zero. The vault settlement rule of Taiping Mountain Tunnel is best expressed as an exponential function. The fitting result shows that the final convergence value of vault settlement is about 13.7 mm. The construction of Taiping Mountain Tunnel has almost no settlement effect on the existing Jinliwen High-speed Railway Tunnel above. Moreover, in order to decrease the settlement caused by the excavation and lining construction of lower tunnel, the relative measures are proposed.