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A method for determining the timing of shield tunnel structure bonded steel reinforcement and its application

A technology of shield tunneling and determination method, which is applied in the direction of tunnel, tunnel lining, earthwork drilling, etc.

Active Publication Date: 2021-09-03
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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  • A method for determining the timing of shield tunnel structure bonded steel reinforcement and its application
  • A method for determining the timing of shield tunnel structure bonded steel reinforcement and its application
  • A method for determining the timing of shield tunnel structure bonded steel reinforcement and its application

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Experimental program
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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 strengthening 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 present invention relates to a method for determining the timing of bonded steel reinforcement of a shield tunnel structure and its application. The method for determining the timing includes the following steps: 1) conducting indoor model tests based on the load structure method to obtain the shield tunnel under different deformation modes The relationship curve between the horizontal expansion value of the structure and the load is recorded as the first relationship curve; 2) the failure test of the bonded steel reinforced structure is carried out to obtain the bearing capacity of the reinforced structure and the relationship curve between the horizontal expansion value of the reinforced structure and the load is recorded as the second relationship curve. Relational curve; 3) obtain the curve formula of the horizontal expansion value of the reinforcement point and the ultimate bearing capacity of the structure and the horizontal expansion value of the reinforcement point and the structural stiffness based on the second relationship curve fitting; 4) obtain the deformation mode and the Deformation conditions, based on the curve formula and the first relationship curve to determine the timing of bonding steel reinforcement. Compared with the prior art, the invention has the advantages of saving energy, effectively improving the service life of the shield tunnel and the like.

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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Patent Type & Authority Patents(China)
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