A monitoring method for lining external water pressure

Abstract

The invention relates to a method for monitoring water pressure outside a lining. The method comprises the following steps: 1) determining the water pressure monitoring area and section according to the leakage water condition of the operating tunnel and the distribution of groundwater during the construction period; 2) determining the water pressure monitoring 3) Use the drilling device to drill holes at the location of the measuring points, and control the drill bit to penetrate into the outer lining according to the thickness of the lining and the size of the drill pipe. In the rock and soil mass; 4) Install the fiber grating piezometer device, and connect the fiber optic lead of the piezometer to the acquisition instrument. When the collected external water pressure value is stable, record the external water pressure value to complete the measurement of the external water pressure of the lining. monitor. Compared with the prior art, the present invention has the advantages of reasonable layout of monitoring points, little impact on structural force bearing, no need for pre-embedded instruments, triple sealing will not affect the waterproof performance of the structure, and high monitoring accuracy.

Description

technical field [0001] The invention relates to the field of monitoring the water pressure outside the tunnel lining, in particular to a monitoring method for the water pressure outside the lining. Background technique [0002] In the existing tunnel lining external water pressure monitoring scheme (Chinese patent CN201920168328.2), the tunnel piezometer is installed mainly through the method of pre-burying the piezometer during the tunnel construction period, and the basic steps are as follows: [0003] (1) Pre-buried piezometer installation pipe: Before the construction of the tunnel inverted arch lining, the pre-buried piezometer U-shaped installation pipe, one end of the pipe is connected to the longitudinal blind pipe behind the lining, and the middle part is located at the other end below the drainage side ditch and the cable trough Higher than the inverted arch lining, then pour the inverted arch lining concrete and the inverted arch filling concrete in sequence to re...

AI Technical Summary

Problems solved by technology

[0006] The main disadvantage of the existing method is that the installation pipeline of the piezometer is pre-buried before the inverted arch pouring during the construction period, which delays the construction period of the tunnel and increases the construction cost; and in the process of tunnel design and construction, it is impossible to predict various potential problems that the tunnel may face during the operation period. In such a situation, the pre-embedding method has limitations. It can only monitor the external water pressure of individual monitoring points set in advance, and it is impossible to flexibly arrange monitoring points according to the needs of tunnel structural safety status analysis during the operation period.

However, the method of drilling monitoring during the conventional operation period will affect the bearing capacity of the tunnel lining and the waterproof performance of the tunnel, which will have an adverse effect on the safety of the tunnel operation.

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