Method for monitoring external water pressure of lining

Abstract

The invention relates to a method for monitoring the external water pressure of a lining. The method comprises the following steps of: 1) determining a water pressure monitoring area and a section according to the water leakage condition of an operating tunnel and the underground water distribution condition in a construction period; 2) determining the position of a water pressure monitoring point, and determining the arrangement position of the monitoring point and the size of a fiber grating osmometer device; 3) drilling at the arrangement position of the monitoring point by adopting a drilling device, and controlling a drill bit to be immersed into a rock-soil body outside the lining according to the thickness of the lining and the size of a drill rod; and 4) installing the fiber grating osmometer device, connecting an osmometer optical fiber lead with an acquisition instrument, and recording the external water pressure value after the acquired external water pressure value is stable, thereby completing monitoring of the external water pressure of the lining. Compared with the prior art, the method disclosed by the invention has the advantages that the monitoring point is reasonably arranged, the influence on the structural stress bearing is small, pre-embedded instruments are not needed, the structural waterproof performance is not influenced by triple sealing, the monitoring precision is high, and the like.

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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