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A method for judging the applicability of a shield tunnel under a ground crack environment

A technology of shield tunneling and ground fissures, which is applied in the field of applicability judgment of shield tunneling in the environment of ground fissures

Inactive Publication Date: 2019-01-08
CHANGAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing technology cannot solve the stability problem of shield tunneling in areas with densely developed ground fissures. It is very important to find a method that can judge whether the tunnel lining structure is stable in the ground fissure environment.

Method used

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  • A method for judging the applicability of a shield tunnel under a ground crack environment
  • A method for judging the applicability of a shield tunnel under a ground crack environment
  • A method for judging the applicability of a shield tunnel under a ground crack environment

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Embodiment

[0032] refer to Figure 11 , taking a subway line 2 project (North-South Line) as an example, the subway will pass through 10 ground fissures from north to south. This embodiment is to judge whether the strength and deformation of the double-layer lining meet the specification requirements. , complete the establishment and calculation of the finite element model under various working conditions on the MSC.MARC (2001) software, the specific process is as follows:

[0033] In the first step, the external lining is a 300mm thick C50 reinforced concrete segment, the inner lining is kept at a thickness of 300mm and the concrete strength is C30, and the relative displacement of ground cracks is simulated in the finite element software at 5cm, 10cm, 15cm, 20cm, The stress and deformation of the double-layer lining structure under 7 different working conditions of 30cm, 40cm and 50cm are used to analyze the size and law of the influence of the relative displacement of ground fissures,...

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Abstract

The invention discloses a method for judging the applicability of a shield tunnel under the ground crack environment. In the shield tunnel under the ground fissure environment, the relationship between the maximum vertical deformation of lining and lining thickness, the relationship between the maximum tensile stress of lining and lining thickness, and the relationship between the maximum compressive stress of lining and lining thickness are obtained under the same staggered distance between upper and lower coils of ground fissure and tunnel lining strength. Under the same staggered distance between upper and lower walls of ground cracks and tunnel lining thickness, the relationship between the maximum vertical deformation of lining and lining strength grade, the relationship between the maximum tensile stress of lining and lining strength grade, and the relationship between the maximum compressive stress of lining and lining strength grade are obtained. Under the same staggered distance between upper and lower walls of ground cracks and tunnel lining thickness, the relationship between the maximum vertical deformation of lining and lining strength grade, the relationship between the maximum tensile stress of lining and lining strength grade, and the relationship between the maximum compressive stress of lining and lining strength grade are obtained. Through the above curves and standards, the method can more accurately determine whether the shield tunnel under different working conditions to meet the strength and deformation requirements.

Description

technical field [0001] The invention belongs to the field of anti-seismic fortification technology, and relates to a method for judging whether a tunnel lining structure is applicable in an environment of ground fissures, in particular to a method for judging the applicability of a shield tunnel in an environment of ground fissures. Background technique [0002] Since the reform and opening up, with the growing national economy, infrastructure construction is also in full swing. Nowadays, the subway covers almost all major cities at home and abroad. When the local cracks are very developed, the stability of the subway tunnel lining structure needs to be considered in the construction of urban subways. The existing technology cannot solve the stability problem of shield tunneling in areas with densely developed ground fissures. It is very important to find a method that can judge whether the tunnel lining structure is stable in the ground fissure environment. Contents of th...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/23
Inventor 邓亚虹宣友徐召
Owner CHANGAN UNIV
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