Tunnel section convergence deformation quantitative calculation method based on high-density measuring point strain

A technology of convergent deformation and quantitative calculation, applied in measurement devices, neural learning methods, complex mathematical operations, etc., can solve the problem that the distributed sensing optical cable cannot be laid along the section closed, the deformation calculation result error, and the additional level cannot be considered. Convergence deformation and other problems, to achieve the effect of improving computational accuracy, computational efficiency, and good robustness

Active Publication Date: 2022-07-22
HARBIN INST OF TECH +2
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Problems solved by technology

When the fully distributed optical fiber sensing technology is used to monitor the horizontal convergence deformation of the tunnel section, the ideal cable layout scheme is to lay the sensing cable along the ring direction of the tunnel section; however, considering the driving safety of subway trains, shield tunnel vault Areas are usually unable to lay sensing optical cables, which leads to the fact that the distributed sensing optical c

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  • Tunnel section convergence deformation quantitative calculation method based on high-density measuring point strain
  • Tunnel section convergence deformation quantitative calculation method based on high-density measuring point strain
  • Tunnel section convergence deformation quantitative calculation method based on high-density measuring point strain

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Example Embodiment

[0023] Embodiment 1: This embodiment describes a quantitative calculation method for tunnel section convergence deformation based on high-density measuring point strain, and the method includes the following steps:

[0024] Step 1: Use the hoop strain monitoring data of the high-density measurement points of the tunnel section obtained by the fully distributed optical fiber sensor to construct a ring-shaped curved beam model of the tunnel section based on the conjugate curved beam theory, and establish the relationship between the hoop strain of the high-density measurement points of the tunnel section The section convergence deformation transformation model is used to calculate the convergence deformation of the tunnel section;

[0025] Step 2: Build the basic structure of the calculation force method for the additional horizontal convergence deformation of the tunnel section, and calculate the additional horizontal convergence deformation of the section caused by the longitud...

Example Embodiment

[0029] Embodiment 2: The method for quantitatively calculating the convergence deformation of tunnel section based on the strain of high-density measuring points described in Embodiment 1, in step 1, the calculation method for the amount of convergence deformation of the tunnel section is:

[0030] (1) Using the fully distributed sensing optical cable laid along the ring length of the tunnel section, the strain monitoring data of high-density measuring points are collected and obtained. Convergence deformation to arbitrary position coordinates (p,λ) (p=1,2,...,n; 0≤λ<1), namely

[0031]

[0032] In the formula, Represents the convergence deformation at the azimuthal coordinates (p, λ) caused by the bending moment; β represents the central angle corresponding to the two circumferential strain points of the optical fiber; R represents the radius of the tunnel section segment; h represents the height of the tunnel section segment ; Represents the hoop strain of the section...

Example Embodiment

[0039] Embodiment 3: In the method for quantitatively calculating the convergence deformation of tunnel section based on high-density measuring point strain according to Embodiment 1, in step 2, the calculation method for the additional horizontal convergence deformation of tunnel section under the extrusion effect is:

[0040] (1) The additional horizontal convergence deformation of the section caused by the extrusion effect is affected by the thickness of the segment, the radius of the segment, the moment of inertia of the segment and the longitudinal bending curvature of the tunnel. According to the mechanism of the extrusion effect caused by the longitudinal bending, the connection stiffness of the section is considered. The additional horizontal convergence deformation of the section under the extrusion effect is calculated by the following formula, namely

[0041]

[0042] In the formula, represents the additional horizontal convergence deformation of the tunnel sect...

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Abstract

The invention discloses a tunnel section convergence deformation quantitative calculation method based on high-density measuring point strain, and belongs to the field of tunnel section convergence deformation monitoring. According to the method, a tunnel section high-density measuring point circumferential strain and convergence deformation conversion relation model is constructed, a tunnel section additional horizontal convergence deformation calculation method considering an extrusion effect and a shear effect is provided, and a tunnel section strain-horizontal convergence deformation conversion model is established by using an artificial neural network theory; and providing a tunnel multi-section horizontal convergence deformation calculation method. According to the method, on the basis of high-density measuring point circumferential strain monitoring data provided by a distributed optical fiber sensing technology, a tunnel section horizontal convergence deformation calculation method considering a longitudinal bending additional effect is established based on a conjugate curved beam theory and an artificial neural network, and a tunnel section strain-horizontal convergence deformation conversion model is established; the problem of tunnel multi-section horizontal convergence deformation calculation by using distributed optical fiber strain monitoring data is solved, and the method has good robustness.

Description

technical field [0001] The invention belongs to the field of tunnel section convergence deformation monitoring, in particular to a quantitative calculation method for tunnel section convergence deformation based on high-density measuring point strain. Background technique [0002] Accurately monitoring the development and evolution of the horizontal convergence deformation of the tunnel section can effectively ensure the operational safety of the tunnel structure. When the fully distributed optical fiber sensing technology is used to monitor the horizontal convergence and deformation of the tunnel section, the ideal optical cable layout plan is to lay the sensing optical cable along the tunnel section in the circumferential direction; however, considering the safety of subway trains, the shield tunnel vault Generally, the sensing optical cable cannot be laid in the area, so that the distributed sensing optical cable laid in the section cannot adopt the layout method of closi...

Claims

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Application Information

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IPC IPC(8): G01B11/16G06F17/11G06F17/16G06N3/08
CPCG01B11/18G06F17/11G06F17/16G06N3/08
Inventor 刘洋孙杰李虎牟晓岩刘相华杨勇刘锋高庆飞
Owner HARBIN INST OF TECH
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