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Shield tunnel service performance health evaluation method

A technology for shield tunneling and health assessment, applied in instrumentation, geometric CAD, design optimization/simulation, etc., can solve problems such as the lack of methods for determining the service performance of shield tunnels, complex influencing factors of tunnels, and large manpower costs, and achieve good practical results. The effect of applying value

Active Publication Date: 2020-07-17
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complexity of factors affecting tunnel service performance degradation, the existing evaluation systems and standards for shield tunnel service performance are mainly based on engineering experience and theoretical analysis, and generally require a lot of manpower and financial resources to analyze the various aspects of the tunnel structure. There is a lack of a concise, fast and reasonable method for determining the service performance of shield tunnels

Method used

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  • Shield tunnel service performance health evaluation method
  • Shield tunnel service performance health evaluation method
  • Shield tunnel service performance health evaluation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] method process, including:

[0027] step 1:

[0028] Step 1-1:

[0029] Based on the load structure method, the similar model test method was used to carry out the stress deformation failure test of the shield tunnel structure, and record the test phenomena, including the key points of the tunnel failure process, the tunnel deformation δ (including the vertical convergence δ 1 and horizontal expansion δ 2 ), the bolt axial force N and the corresponding load P, and then use formulas (1)-(3) to return the model deformation δ, bolt axial force N and load P to the prototype, and calculate the tunnel ellipticity C by formula (4) , and then use formulas (5)-(7) to calculate the tunnel ellipticity ratio X, bolt axial force ratio Y and load ratio P r ;

[0030] Tunnel deformation δ:

[0031] where δ is the tunnel deformation of the prototype, δ m is the deformation of the tunnel model, C l is the size similarity ratio, the same below.

[0032] Bolt axial force N:

...

Embodiment 2

[0113] On the basis of Embodiment 1, an application embodiment is further given below, and step 4 is introduced.

[0114] Step 4:

[0115] Step 4-1:

[0116] Measuring the tunnel deformation δ of the tunnel on site 测 (including the vertical convergence value δ 1测 and the horizontal expansion value δ 2测 ) and bolt axial force N 测 , the vertical convergence value δ 1测 and the horizontal expansion value δ 2测 Substitute into formula (4) to get the tunnel ellipticity C 测 , and then the measured tunnel ellipticity C 测 and bolt axial force N 测 Substitute into formulas (5) and (6) respectively to get the tunnel ellipticity ratio X 测 and bolt axial force ratio Y 测 .

[0117] The tunnel ellipticity C:

[0118] In the formula, D is the outer diameter of the tunnel.

[0119] The tunnel ellipticity ratio X:

[0120] In the formula, C 测 is the measured tunnel ellipticity, C max测 is the tunnel limit ellipticity determined from the test to the prototype.

[0121] The bolt...

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Abstract

A shield tunnel service performance health evaluation method comprises the steps: (1) based on a load structure method, obtaining and recording the function relation between the tunnel ovality and bolt axial force ratio and the load ratio as a first relation curve and a second relation curve respectively; 2) defining an expression of tunnel service performance health degree, establishing a function relationship among the ovality, the bolt axial force and the load ratio, solving an unknown quantity in the tunnel service performance health degree expression based on the test data, further drawing an isoline heat map of a relationship function among the tunnel service performance health degree, the ovality and the bolt axial force ratio, and recording the isoline heat map as a third relationship curve; and 3) based on the first relation curve, the second relation curve and the third relation curve, establishing a tunnel service performance health degree and load ratio function relation, recording the function relation as a fourth relation curve, analyzing to obtain a value range of the tunnel service performance health degree corresponding to the key points in different stages, and dividing tunnel service performance grades. According to the method, the tunnel structure safety can be evaluated quickly, simply and reasonably.

Description

technical field [0001] The invention relates to a health evaluation method for the service performance of a shield tunnel. Background technique [0002] The subway shield tunnel is in a complex geological environment. With the increase of the service time of the tunnel and the change of the external environment, the safety and durability of the tunnel structure will be reduced to varying degrees, and the service performance of the structure will gradually deteriorate. The overall large deformation, water leakage, long cracks, concrete falling blocks, uneven settlement and other diseases occur, which seriously threaten the operation safety of subway tunnels. Therefore, in order to reasonably evaluate the service performance of existing aging tunnel structures and take targeted maintenance and reinforcement measures, it is of great significance to establish a scientific evaluation method for the service performance of shield tunnel structures. However, due to the complexity o...

Claims

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Application Information

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IPC IPC(8): G06F30/13G06F30/20G06F119/04G06F119/14
CPCY02T90/00
Inventor 刘学增赖浩然桑运龙段俊铭
Owner TONGJI UNIV