Long-term deformation monitoring method for operated cross-river subway tunnel

Abstract

The invention discloses a long-term deformation monitoring method for an operated cross-river subway tunnel in a tunnel project. The method uses a manner combining cross-river leveling surveying and leveling surveying of a cross-river subway tunnel shield segment, leveling routes formed by using of deep pile points (elevation control points) at both ends of the cross-river tunnel shield segment are taken as starting testing points and cross-river leveling routes form a closed ring leveling route, wherein the cross-river leveling routes are formed by respective connecting of first order leveling from the deep pile points to leveling points of both banks of a river, the leveling surveying of the cross-river subway tunnel shield segment includes subsidence measurement of a river-crossing shield tunnel subway station and structural deformation measurement of the cross-river shield segment; the monitoring method for the cross-river subway tunnel is convenient, simple, and inexpensive, and can achieve high-precision measurement. The method combining the cross-river leveling surveying and the leveling surveying of the cross-river subway tunnel shield segment is used to form closed loop mutual verification, and the method can monitor the deformation of the subway tunnel for a long time.

Description

technical field [0001] The invention relates to surveying and mapping, in particular to a method for measuring the long-term deformation of an operating cross-river subway tunnel in tunnel engineering. Background technique [0002] In the operation of the subway, the subway tunnel passes through the stratum with different hydrogeological conditions to produce uneven settlement deformation. If the deformation exceeds the specified limit, it will affect the normal use of the subway structure, and even endanger the safety of the subway structure in severe cases. Therefore, it is of great significance to carry out deformation monitoring during the operation of the subway to ensure the safe operation of the subway and save maintenance costs in the long run. [0003] At present, the existing monitoring technologies mainly include the following types: [0004] (1) The traditional manual monitoring method uses traverse measurement to obtain the horizontal deformation of the point t...

AI Technical Summary

Problems solved by technology

In tunnel monitoring, due to limitations such as narrow observation angles, it cannot be widely used on the basis of a single automatic total station. At present, only a single automatic total station can be used to monitor the local deformation of the tunnel.

[0008] In addition, during the cross-river crossing process of the subway, due to the influence of the measurement error of the river tide and the elevation system along both sides of the river, the leveling control points on both sides of the river are prone to systematic errors, which affects the normal progress of tunnel deformation monitoring

However, ordinary leveling technology, ordinary triangular height measurement technology, GPS height measurement technology and static leveling technology are restricted by many conditions, such as the short measurement distance of second-class leveling measurement and poor measurement accuracy across the river, etc., which are difficult to meet the needs of construction.

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