Construction method for dealing with tunnel collapses

A construction method and tunnel technology, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as high safety risks, difficult construction, secondary safety accidents, etc., and achieve the effect of low cost and convenient materials

Active Publication Date: 2010-07-21
CHINA RAILWAY 12TH BUREAU GRP +1
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Problems solved by technology

[0004] The present invention provides a construction method for dealing with tunnel caverns in order to solve the problems of high safety risks, difficult co

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  • Construction method for dealing with tunnel collapses
  • Construction method for dealing with tunnel collapses
  • Construction method for dealing with tunnel collapses

Examples

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example 1

[0035] Landslide situation: The entrance of Jiubao Tunnel was excavated to DK26+857 on May 29, 2008, the left side of the tunnel was excavated to DK26+842, and the right side was excavated to DK26+844. DK26+829~+841 The initial support 1m to the left of the vault was suddenly damaged, and a landslide occurred. The collapse consisted of soil with crushed stones and block stones, and water seepage at the top. Finally, a vertical line with a width of 5m and a parallel line with a length of 12m was formed. , A cave with a height of 6-8m.

[0036] Reason analysis: DK26+829~+841 section is located in the F10 fault fracture zone, the F10 fault fracture belt is 3~5m wide, inclined to the left side of the line, with an inclination angle of about 75°, obliquely intersecting with the cave body at DK26+800~+841, the intersection angle At about 5° to 10°, the fault filling material is breccia-like fragments interbedded with yellow mud, with strand-like and linear water discharges, and the ...

example 2

[0039] Landslide situation: The Jining end of the No. 1 inclined shaft of the Jiubao Tunnel was constructed to DK28+396.5 on June 18, 2008. At 21:40, the front of the tunnel suddenly collapsed and gushed out, resulting in the initial support of the DK28+395~+396.5 section Across the collapse, DK28+395~+405 section collapsed, forming a cavern with a length of 10m, a width of 15m and a height of 5m. The collapsed body is mainly in the shape of fragments and breccias, the collapsed surface is smooth, and the bedrock fissure water is developed, flowing down the rock wall in multiple strands.

[0040] Reason analysis: The design enters the F3 fault affected zone from DK28+370. Due to multi-stage tectonic movements superimposed by the development of surrounding rock joints, the joint surface is smooth and contains soft mud, the rock mass is broken, and it has a gravel-like crushed structure, and structural fissure water and bedrock fissure water developed, local pressure-bearing. T...

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Abstract

The invention relates to the tunnel construction field, in particular to a construction method for dealing with tunnel collapses to solve the existing problems such as high security risks, construction difficulty and failures to guarantee the construction quality. To achieve such purposes, the construction method comprises the following steps: solidifying the preliminary bracing of the adjourning landslides with temporary umbrella arches, and sealing off the collapse surface with spraying concrete after the collapsed cave is stabilized. The method also requires building of a working platform with ruins in the cave, and laying of sand bags on the platform to form an arch-shaped solid membrane. A concrete solidified ring is built by infusing concrete through the reserved pipeline. On top of the concrete solidified ring, a buffer ring is formed by infusing the solidified ring with sands and fly ash mixture, then the supporting system of the cave is constructed when the required strength of the concrete solidified ring is met. With the construction method, the security of the construction can be guaranteed with no quality or security risk to the collapsed section. The materials required in the method are easily available and cheap. Compared with the traditional construction methods, the new construction method can save up to 30 percent of material cost, 50 percent of risk charges, and 20 percent of labor expense for each linear meter of similar collapsed tunnels. The method of invention is efficient, safe, economical and risk-free.

Description

technical field [0001] The invention relates to the field of tunnel engineering construction, in particular to a construction method for dealing with tunnel collapse. Background technique [0002] With the continuous development of the national economy, the construction of highways, railways and water diversion projects in our country is advancing by leaps and bounds. In order to meet the requirements of high speed, high cost and low cost, the number of tunnel projects is increasing, and the scale and difficulty of tunnel construction are also increasing. Although The level of tunnel construction has also made great progress, but due to various reasons, tunnel collapse is still unavoidable, especially small and medium-sized vault collapses are more common, and small and medium-sized vault collapses generally form caves of different sizes, some caves The collapse will stabilize to a certain extent. It is generally not too difficult to deal with this kind of cavern, but some c...

Claims

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Application Information

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IPC IPC(8): E21D9/01E21D11/10E21D11/12E21D9/12
Inventor 王利民徐铁卫张建伟田晓峰
Owner CHINA RAILWAY 12TH BUREAU GRP
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