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Shield tunnel structure sticky steel reinforcing and strengthening time determining method and application

A technology for shield tunneling and determining methods, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as shield tunnel reinforcement and treatment, and achieve the effect of high reliability and wide application range

Active Publication Date: 2020-05-12
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, there is no method for determining the timing of bonded steel reinforcement, and it is impossible to effectively reinforce the shield tunnel to achieve the purpose of saving energy and improving the service life of the tunnel

Method used

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  • Shield tunnel structure sticky steel reinforcing and strengthening time determining method and application
  • Shield tunnel structure sticky steel reinforcing and strengthening time determining method and application
  • Shield tunnel structure sticky steel reinforcing and strengthening time determining method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment provides a method for determining the timing of bonded steel reinforcement for a shield tunnel structure, such as figure 1 shown, including:

[0037] Step 1: Carry out indoor model tests based on the load structure method, and obtain the relationship curve between the horizontal expansion value of the shield tunnel structure (that is, the horizontal deformation value) and the load under different deformation modes, which is recorded as the first relationship curve. The recorded failure key points of the tunnel structure are marked on the horizontal expansion vs. load curve.

[0038] In this embodiment, the relationship curve between horizontal expansion and load is divided into four stages of I, II, III and IV in sequence based on the four key points of the first cracking of the structure, the first yield of steel bars or bolts, the limit state point and the structure's imminent collapse, and Get the ultimate load P corresponding to the limit state poin...

Embodiment 2

[0086] This embodiment provides a method for reinforcing and reinforcing a shield tunnel structure by sticking steel. The method reinforces the on-site shield tunnel structure based on the reinforcement timing determined by the timing determination method described in Embodiment 1.

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Abstract

The invention relates to a shield tunnel structure sticky steel reinforcing and strengthening time determining method and application. The time determining method comprises the following steps that firstly, an indoor model test is conducted on the basis of a load structure method, a shield tunnel structure horizontal expansion value and load relation curve under different deformation modes is obtained and recorded as a first relation curve; secondly, a sticky steel reinforcing structure damage test is conducted, and a strengthening structure bearing performance, strengthening structure horizontal expansion value and load relation curve is obtained and recorded as a second relation curve; thirdly, based on the second relation curve, a strengthening point horizontal expansion value, structure extreme bearing force, strengthening point horizontal expansion value and structure rigidity curve formula is obtained through fitting; and fourthly, a deformation mode and a deformation condition of the field shield tunnel structure are obtained, and the sticky steel strengthening time is determined on the basis of the curve formula and the first relation curve. Compared with the prior art, theshield tunnel structure sticky steel reinforcing and strengthening time determining method and the application have the advantages that energy is saved, and the service life of a shield tunnel is effectively prolonged.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a method for determining the timing of bonded steel reinforcement for a shield tunnel structure and its application. Background technique [0002] Due to the influence of construction quality and surrounding engineering activities, large deformation of the subway shield tunnel structure has become a common problem in subway tunnels. Excessive deformation of the tunnel structure will induce tunnel diseases such as local settlement, segment cracking, and water leakage, which will accelerate the deterioration of the tunnel structure performance and seriously threaten the safe bearing capacity of the subway tunnel structure. [0003] In order to ensure the safety of the tunnel structure and maintain the normal operation of the subway, it is necessary to take necessary reinforcement measures for the abnormally deformed shield tunnel. The bonded steel reinforcement method i...

Claims

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Application Information

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IPC IPC(8): E21D11/00G01N3/08
CPCE21D11/00G01N3/08G01N2203/0003G01N2203/0019G01N2203/0075G01N2203/0208G01N2203/0676G01N2203/0682
Inventor 刘学增赖浩然桑运龙段俊铭
Owner TONGJI UNIV