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Approximate full face excavation structure and methods for mountain highway tunnel in critical stable surrounding rock

A road tunnel, critical stability technology, applied in tunnels, tunnel lining, earthwork drilling and mining, etc., can solve problems such as tunnel construction collapse

Pending Publication Date: 2017-08-25
NINGBO COMM PLANNING INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem in the prior art that when the approximately critically stable (including broken) surrounding rock is poor, tunnel construction collapse is prone to occur, and to provide a critically stable surrounding rock approximate full-section excavation structure for mountain road tunnels and methods, so that the excavation and support construction of tunnel sections is close to the problem of plane mechanics, and the construction safety can be ensured while improving the excavation efficiency

Method used

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  • Approximate full face excavation structure and methods for mountain highway tunnel in critical stable surrounding rock
  • Approximate full face excavation structure and methods for mountain highway tunnel in critical stable surrounding rock
  • Approximate full face excavation structure and methods for mountain highway tunnel in critical stable surrounding rock

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Embodiment 1

[0031] Such as figure 2 As shown, when the tunnel face is basically stable during tunnel construction, it is advisable to adopt a moderately advanced approach to the full-section construction method of the lower pilot tunnel.

[0032] The face excavation structure of this method is as follows: figure 2 ), along the outer edge of the tunnel contour line, φ108-120mm advanced pipe sheds are built at intervals of 50cm at 2-10° inclination angles in the surrounding rock of the tunnel, and the advanced pipe sheds are filled with cement mortar to form an advanced pre-support structure for the tunnel. A downward pilot tunnel with an arc top is opened on the face of the tunnel within the contour line of the tunnel. The width and height of the excavation plane of the downward pilot tunnel are 4-5m and the longitudinal advance is 3-5m along the excavation direction; the contour line of the tunnel and the downward pilot tunnel The excavation footage of the section clamped between the o...

Embodiment 2

[0040] Such as image 3 As shown, when the face of the tunnel is stable at the boundary during tunnel construction, it is advisable to use short steps to reserve the core soil and approximate the full-section construction method.

[0041] The face excavation structure of this method is as follows: image 3 ) shows that along the outer edge of the tunnel contour line, φ108-120mm advanced pipe sheds are drilled at an interval of 50cm at an inclination angle of 2-10° in the surrounding rock of the tunnel, and the advanced pipe sheds are filled with cement mortar to form an advanced pre-support structure for the tunnel; There are inclined upper and lower steps on the face of the tunnel within the contour line. The upper step is 1-3m ahead of the lower step, and the core soil is reserved for both the upper and lower steps; the excavated tunnel is provided with initial support to bear all Surrounding rock load.

[0042] The construction steps of the approximate full-section constr...

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Abstract

The invention discloses an approximate full face excavation structure and methods for a mountain highway tunnel in critical stable surrounding rock and belongs to the field of construction. Aiming at the defect that a full-face construction method cannot be adopted in tunnel construction with poorer surrounding rock stability, longitudinal length for partial excavation support construction of the tunnel is reduced, so that partial excavation support construction of the tunnel approximates an issue of planar mechanics, and two effective approximate full face construction methods for the mountain highway tunnel in the approximate critical stable surrounding rock are provided through practice of construction of the mountain highway tunnel in the approximate critical stable surrounding rock containing crushed surrounding rock.

Description

technical field [0001] The invention belongs to the field of construction methods, and in particular relates to an approximately full-section excavation structure and method for a critically stable surrounding rock of a road tunnel in a mountainous area. Background technique [0002] In recent years, with the extension of my country's road network, more and more tunnels in mountainous areas have been built. In general, it is more difficult to build highway tunnels in approximately critically stable (including broken) surrounding rocks than in stable surrounding rocks. At present, many approximately critically stable (including broken) surrounding rock tunnels built in my country are constructed using the CD / CRD method, multi-step method, or multiple combination methods, such as figure 1 shown. However, the different longitudinal excavation and support lengths of each section will result in insufficient spatial stability during tunnel construction or difficulty in forming a...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D11/14E21D11/10
CPCE21D9/00E21D11/10E21D11/107E21D11/14
Inventor 朱汉华邓之友陈孟冲
Owner NINGBO COMM PLANNING INST CO LTD
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