Supporting structure and supporting method for limiting horizontal displacement of steep dip phyllite tunnel

A technology of horizontal displacement and support structure, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., to achieve obvious effects, prevent large deformation from continuing to develop, and facilitate popularization and use

Pending Publication Date: 2020-05-12
四川省交通勘察设计研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a support structure and method for limiting the horizontal displacement of steep phyllite tunnels, so as to solve the difficult problem of tunnel construction caused by the deformation of steep phyllite tunnels in the prior art, and realize large deformation of phyllite tunnels. The purpose of limiting the horizontal displacement and preventing the continuous development of large deformation

Method used

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  • Supporting structure and supporting method for limiting horizontal displacement of steep dip phyllite tunnel
  • Supporting structure and supporting method for limiting horizontal displacement of steep dip phyllite tunnel

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Such as figure 1 A support structure for limiting the horizontal displacement of a steeply inclined phyllite tunnel is shown, including a tunnel body, primary support 5 located in the tunnel body, and secondary lining 4. The tunnel body includes a vault and a side wall. It is characterized in that the tunnel body reserves a deformation amount 3, and the width of the deformation amount 3 at the side wall is greater than that at the vault; it also includes the anchor rod 1 arranged at the vault, the anchor rod 1 arranged at the side wall The anchor pipe 2, the anchor rod 1 and the anchor pipe 2 are all anchored into the surrounding rock.

Embodiment 2

[0031] Such as figure 1 A support structure for limiting the horizontal displacement of a steeply inclined phyllite tunnel is shown. On the basis of Embodiment 1, the length of the anchor pipe 2 is greater than the length of the anchor rod 1 . Several anchor pipes 2 are distributed in a quincunx shape at the side wall, and the distance between two adjacent anchor pipes 2 is 1m. The secondary lining 4 is a reinforced concrete structure. The initial support 5 includes a steel mesh and a steel frame; the steel mesh is a double-layer steel mesh; the steel frame is an I-beam, and the steel frame includes a locking foot anchor pipe.

Embodiment 3

[0033] A support method for limiting the horizontal displacement of a steeply inclined phyllite tunnel:

[0034] (1) Increase the reserved deformation of the tunnel. The reserved deformation adopts unequal thickness and width. The reserved deformation of the vault is small, and the reserved deformation of the side wall (especially at the upper and lower steps) is increased. The deformation of the constructed section is determined so that the reserved deformation matches the initial support deformation.

[0035] (2) The steel mesh adopts double layers Reinforced mesh, spacing 20cm×20cm. For the anchor rods of the weakened vault system, the distance between the anchor rods at the top shall be determined according to the lower limit value of the tunnel code; Small conduits, 1m x 1m apart, arranged in a quincunx shape.

[0036] (3) The initial support steel frame adopts I18 or I20 I-steel, and the I-steel strengthens the locking feet of the steel frame to release and resist t...

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Abstract

The invention discloses a supporting structure and a supporting method for limiting horizontal displacement of a steep dip phyllite tunnel. The supporting structure comprises a tunnel body and primarysupporting and secondary lining positioned inside the tunnel body. The tunnel body comprises a vault and a side wall; the tunnel body reserves deformation; and the width of the deformation at the side wall is larger than that at the vault. The supporting structure also comprises anchor rods arranged at the vault and anchor pipes arranged at the side wall, and the anchor rods and the anchor pipesare both anchored into surrounding rocks. The invention aims to provide a supporting structure and a supporting method for limiting the horizontal displacement of the steep dip phyllite tunnel, so asto solve the difficulty of tunnel construction caused by steep phyllite deformation in the prior art, and achieve the purposes of limiting the horizontal displacement of the large deformation of the phyllite tunnel and preventing the large deformation from continuously developing.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a support structure and method for limiting the horizontal displacement of a steeply inclined phyllite tunnel. Background technique [0002] In recent years, more and more mountain roads have been planned and constructed. More and more tunnels have also been planned and built, especially in some southwestern mountainous areas. The tunnels with high seismic intensity, accompanied by fault fracture zones, and water-rich phyllite strata have brought great difficulties to tunnel construction. The initial support is long-term. Deformation, the amount of deformation is large, and large deformation is an after-the-fact problem, which brings great hidden dangers to tunnel construction safety and structural safety. Up to now, there are different opinions on the treatment of large deformation in the prior art. Ensuring construction safety and structural safety is a sore point, focus and...

Claims

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Application Information

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IPC IPC(8): E21D11/00E21D11/10E21D11/15E21D11/20E21D20/00
CPCE21D11/003E21D11/006E21D11/10E21D11/152E21D11/20E21D20/00
Inventor 张生袁松张武先刘洪利雷良袁文强占盼
Owner 四川省交通勘察设计研究院有限公司
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