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A Construction Method for Quickly Closing Weak Surrounding Rocks and Forming Rings in Single-track Tunnels

A technology with weak surrounding rocks and closed rings, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., to achieve the effects of reducing the cost of replacing initial supports, reasonable procedures, and reducing the accumulation of deformation

Active Publication Date: 2021-02-02
KUNMING RAILWAY CONSTR COMPANY OF CHINA RAILWAY NO 8 ENG GRP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the above-mentioned problems, the present invention provides a construction method for quickly closing the weak surrounding rock of a single-line tunnel to form a ring. The construction method adopts the 3-step method for excavation and support, and quickly closes the initial support of the inverted arch, and the lining of the rear inverted arch is followed up in time, effectively Inhibition of large deformation of weak surrounding rock

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  • A Construction Method for Quickly Closing Weak Surrounding Rocks and Forming Rings in Single-track Tunnels
  • A Construction Method for Quickly Closing Weak Surrounding Rocks and Forming Rings in Single-track Tunnels
  • A Construction Method for Quickly Closing Weak Surrounding Rocks and Forming Rings in Single-track Tunnels

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Embodiment Construction

[0038]The present invention will be further described below in conjunction with the description of the accompanying drawings. The methods of the present invention include but are not limited to the following embodiments.

[0039]A construction method for quickly closing the weak surrounding rock of a single-track tunnel into a ring. The cross section to be excavated from top to bottom includes upper step 1, middle step 2, lower step 3 and invert 4, such asfigure 1 As shown, the middle step 2 includes a left side 21 of the middle step and a right side 22 of the middle step, and the lower step 3 includes a left side 31 and a right side 32 of the lower step respectively, asfigure 2 As shown, including the following steps:Figure 3-12As shown,Figure 3-12Part a is a radial cross-sectional view of the tunnel, and part b is an axial cross-sectional view of the tunnel;

[0040]Step 1: Use the three-step method for excavation without setting up core soil, including the following steps:

[0041]1) Exca...

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Abstract

The invention provides a single-line tunnel construction method for rapid closure and ring formation of weak surrounding rocks. Three steps are used for excavation, no core soil is set, and the upper, middle and lower steps are excavated synchronously. The left and right sides of the steps are staggered and excavated synchronously. After the three-step working condition is formed, excavate in time, support the inverted arch and backfill the initial support of the inverted arch. Circular excavation of each step and the initial support of the inverted arch to a certain length, and then excavation of the backfilled initial support, using the trestle bridge to construct the inverted arch lining. After the inverted arch lining reaches a certain length and meets the requirements through observation, the arch wall lining construction will be carried out. This construction method adopts the three-step method of excavation and support, quickly closes the initial support of the inverted arch, and then follows up the lining of the inverted arch in time to effectively suppress the large deformation of the weak surrounding rock.

Description

Technical field[0001]The invention relates to the field of tunnel engineering, in particular to a construction method for quickly closing and forming a loop of a soft rock large deformation single-line tunnel in a geological suture zone.Background technique[0002]At present, my country's infrastructure construction is rapidly developing, and a large number of tunnel projects are inevitably designed in the construction of water conservancy, railways, highways and subways. The construction of tunnel engineering is difficult, the safety risk is high, and the economic investment is uncontrollable. In particular, the construction technical problems of tunnel engineering with poor geological conditions such as weak surrounding rock and complex geostress are still in the exploratory stage. It is a worldwide problem and there is no mature supporting construction. The method is effective. At present, the construction of tunnels with complex geostress and weak surrounding rocks mainly involves...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D11/00E21D11/10E21D20/00
CPCE21D9/00E21D11/00E21D11/105E21D20/00
Inventor 郭相武邓成宏肖仲红何兴龙夏发宝吴治勐王智勇王银之李永山陈伟龚斯昆李彪李邵阳代一超胡学龙杨选择段永进熊田刘薇邹锦坤戴海龙李敏
Owner KUNMING RAILWAY CONSTR COMPANY OF CHINA RAILWAY NO 8 ENG GRP
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