Structural computation method of shield tunnel liner continuous and nonuniform stiffness model

A stiffness model and shield tunnel technology, applied in the calculation field of shield tunnel lining structure, can solve the problems of structural design deviation, can not accurately reflect the stiffness distribution characteristics of shield tunnel lining segment ring, etc., to avoid uncertainty Effect

Inactive Publication Date: 2009-02-11
TONGJI UNIV
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Problems solved by technology

[0015] In summary, none of the existing calculation methods can accurately reflect the stiffness distributi...

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  • Structural computation method of shield tunnel liner continuous and nonuniform stiffness model
  • Structural computation method of shield tunnel liner continuous and nonuniform stiffness model
  • Structural computation method of shield tunnel liner continuous and nonuniform stiffness model

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Embodiment Construction

[0037] The shield tunnel lining structure calculation method of the present invention adopts a brand-new continuous structure model, such as image 3 As shown, in this calculation model, the stiffness of the lining segment ring is non-uniformly distributed, and due to the influence of the joint, the stiffness in a certain range near the joint is lower than that of the main part of the segment; assuming that the central arc of the area where the stiffness of the joint is reduced The length is twice the thickness of the segment, that is, the stiffness in the small section area of ​​1 times the thickness of the segment on both sides of the segment joint is equivalent to a uniform distribution, and the bending moment in this area is equal to the bending moment at the joint; and the joint The stiffness η′EI of the region (η′≤1, which is the equivalent stiffness coefficient of the joint region) is calculated according to the equal cross-sectional rotation angles at both ends of the r...

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Abstract

The invention discloses a shield tunnel lining continuous/non-uniform stiffness model structural calculation method, which comprises the following steps: at first, calculating a load according to the conventional method and preliminarily calculating a structural internal force, and then working out an equivalent stiffness coefficient in a joint area, finally, determining a structural stratigraphic resistance load; and determining a shield tunnel lining continuous/non-uniform stiffness model, and then applying the stratigraphic resistance load and other loads onto the determined continuous/non-uniform stiffness model, calculating the structural internal force and deformation; then, acquiring the stratigraphic resistance load with interative computation according to the computed deformation, until the last and present results are sufficiently close to each other; acquiring the equivalent stiffness in all the joint areas with interative computation according to the internal force at the joint, until the last and present results are sufficiently close to each other, finally, outputting the internal force and deformation computation results. The model structural calculation method adopts a computation model closer to reality. Therefore, the calculated result is more exact.

Description

technical field [0001] The invention relates to a calculation method for a shield tunnel lining structure. Background technique [0002] The prefabricated lining structure of a shield tunnel is assembled from segments, and the calculation of the lining structure is complicated due to the existence of joints. How to consider the influence of joints and determine the mechanical calculation model of the structure is the key to ensure reasonable calculation and reliable design. The currently proposed mechanical models for lining structures are as follows: [0003] (1). The homogeneous ring model is further divided into common usage and modified common usage, such as figure 1 shown. [0004] The usual usage assumes that the segment ring is a ring with uniform bending stiffness, regardless of the flexibility characteristics and bending stiffness drop of the segment joint part, the segment ring is a ring with the same rigidity EI as the main section of the segment and uniform be...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 朱合华廖少明刘丰军闫治国
Owner TONGJI UNIV
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