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Method for calculating displacement of existing shield tunnel caused by ground loading

A technology for shield tunneling and displacement calculation, which is applied in tunneling, calculation, and tunnel lining, etc., and can solve problems such as the inability to calculate the amount of segment misalignment, and the failure to consider the joint effect between the tunnel ring

Active Publication Date: 2017-07-14
ZHEJIANG UNIV CITY COLLEGE
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Problems solved by technology

[0003] Existing calculation methods analyze ground surcharges. Existing shield tunnels are based on the elastic foundation beam method, which simplifies shield tunnels into homogeneous elastic beams, does not consider the "joint effect" between tunnel rings, and cannot calculate segment displacement The amount differs from the actual

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  • Method for calculating displacement of existing shield tunnel caused by ground loading
  • Method for calculating displacement of existing shield tunnel caused by ground loading
  • Method for calculating displacement of existing shield tunnel caused by ground loading

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Embodiment Construction

[0067] The technical scheme of the present invention will be further described below in conjunction with the accompanying drawings of the description:

[0068] Such as Figure 1~5 As shown, the present invention proposes a specific embodiment of the existing shield tunnel displacement calculation method caused by ground surcharge, specific working conditions and parameter values: a shield tunnel with length L=50m and width B= For a 30m residential building, the long side direction is parallel to the longitudinal axis of the subway tunnel, the average vertical load value at the bottom of the building foundation is q=80kPa, the horizontal distance between the load center and the tunnel center is s=30m; the buried depth of the shield tunnel axis is H=12m , segment outer diameter D=8.4m, thickness 0.45m, ring width δ=1.2m, segment elastic modulus E=42GPa, k t =4×10 5 kN·m -1 ; Poisson's ratio of soil μ = 0.35, elastic modulus E s =25MPa, soil weight γ=18.5kN / m 3 ; N takes 250...

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Abstract

The present invention provides a method for calculating the displacement of an existing shield tunnel caused by ground loading. According to the method provided by the present invention, a mechanical calculation model for ground loading is established, and the ''joint effect'' between the tunnel rings is taken into account in the patent; the tunnel is equivalent to the elastic foundation short beam connected by shear springs, and the structural and physical properties of the tunnel are fully taken into account; and vertical displacement (including vertical displacement and horizontal displacement) of the shield tunnel due to ground loading, the amount of dislocation (including the amount horizontal dislocation and the amount of vertical dislocation) between the shield tunnel rings, and shear forces (including the horizontal shear force and the vertical shear force) can be quickly calculated by using the Matlab, so that safety of the tunnel structure under the ground loading can be determined, and the method is more consistent with the actual force and deformation of the shield tunnel.

Description

technical field [0001] The invention belongs to the technical field of underground engineering, and in particular relates to a method for calculating the displacement of an existing shield tunnel caused by ground surcharge. Background technique [0002] When the upper ground of the shield tunnel is loaded, the original force balance is broken, causing the stress redistribution of the shield tunnel, resulting in excessive lateral or longitudinal deformation, causing segment cracking, joint opening, bolt failure, etc. , affecting the safety of the subway. In order to explore the influence of ground surcharge on the underlying shield tunnel and provide theoretical guidance for the prediction of tunnel deformation during the operation period in the future, this patent will establish the displacement of the existing shield tunnel under the ground surcharge, and verify the rationality of the model through comparison of examples sex. [0003] Existing calculation methods analyze ...

Claims

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Application Information

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IPC IPC(8): G06F19/00E21D9/06E21D11/00
CPCE21D9/06E21D11/00G16Z99/00
Inventor 魏纲俞国骅洪文强朱田宇姜婉青张鑫海黄絮陆世杰许奎鑫王彬
Owner ZHEJIANG UNIV CITY COLLEGE
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