Soft phyllite tunnel excavation deformation control method

A tunnel excavation and deformation control technology, applied in tunnels, earthwork drilling, mining equipment, etc., can solve problems such as increasing project costs, threatening construction safety, and difficult deformation, so as to save materials, speed up construction progress, and facilitate construction Effect

Inactive Publication Date: 2014-03-12
CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the weak phyllite with strong weathering, it is difficult to effectively control the deformation by using the three-step seven-step method, and it is prone to large deformation, which seriously threatens the construction safety. Sometimes it is necessary to replace the arch, which greatly increases the project cost and delays duration

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  • Soft phyllite tunnel excavation deformation control method

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Embodiment Construction

[0018] Such as figure 1 As shown, the excavation method of the weak phyllite tunnel includes the following steps:

[0019] (1) Use the vertical steel frame of the upper circulation frame for advanced support.

[0020] (2) Adopt mechanical cooperation with manual or weak blasting to excavate one step up step by step, and at the same time, every time it is looped, the face of the tunnel is sprayed with 5cm thick concrete to seal.

[0021] (3) Implement initial support around the first part of the upper step.

[0022] (4) Excavate 2 steps at the rear of the upper step, and then spray 5cm thick concrete to seal the face of the tunnel for initial support.

[0023] (5) Excavate 3 parts of the middle step after lagging behind 2 parts of the middle step, and then spray 5cm thick concrete to seal the face of the tunnel, and do the initial support. At the same time, after the initial support is completed on the left and right sides 2, 3 of the middle step, a horizontal support is erected at the...

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Abstract

The invention relates to a soft phyllite tunnel excavation deformation control method which comprises the following steps: (1) after preliminary bracing of a top step is finished, lagging the upper step, excavating a middle step on the left side and finishing preliminary bracing; (2) lagging the middle step on the left side, excavating a middle step on the right side, finishing preliminary bracing, and transversely erecting transverse supports on the middle step after the left and right sides of the middle step are completely subjected to preliminary bracing; (3) lagging the middle step, excavating a lower step on the rear part of the right side in a left and right staggered manner, and carrying out preliminary bracing; (4) excavating central reserved core soil and the tunnel bottom, carrying out preliminary bracing on the tunnel bottom and dismantling the transverse supports one by one; (5) after the preliminary bracing of the tunnel bottom, manufacturing an inverted arch in time, and enclosing the inverted arch into a ring as soon as possible. The soft phyllite tunnel excavation deformation control method can be used for effectively controlling the surrounding rock deformation of a tunnel and is high in safety in construction; compared with traditional CD, CRD and double side-wall pilot tunnel methods and other methods, the soft phyllite tunnel excavation deformation control method is simple to operate, and the engineering cost can be greatly reduced.

Description

Technical field: [0001] The invention belongs to a tunnel construction method, in particular to a tunnel excavation deformation method in a weak phyllite formation. Background technique: [0002] The three-step seven-step excavation method is suitable for the construction of tunnels with a section of 100 to 180 square meters and a certain degree of self-stability in surrounding rock sections of grade IV and V. Mainly include: loess, strongly weathered mudstone, strongly weathered argillaceous siltstone, etc. [0003] For the strong weathered weak phyllite, the three-step seven-step method is used to excavate, which is difficult to effectively control the deformation and is prone to large deformation, which seriously threatens the safety of construction. Sometimes the arch replacement is required, which greatly increases the project cost and delays. Duration. Summary of the invention: [0004] The purpose of the present invention is to overcome the shortcomings of the three-step se...

Claims

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Application Information

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IPC IPC(8): E21D9/00
Inventor 李广念黄威望邵大鹏任俊奎周东华
Owner CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP
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