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Method of eliminating liquefaction in shield tunnel stratum in tunnel

A technology for shield tunneling and strata, which is applied to tunnels, tunnel linings, underground chambers, etc., can solve the problems of increased investment, difficult quality control, and large discreteness, and can solve liquefaction elimination, improve liquefaction resistance, and eliminate liquefaction. Effect

Active Publication Date: 2014-07-30
POWERCHINA HUADONG ENG COPORATION LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Avoidance and reroute often lead to unsatisfactory route or increased investment; grouting is often uneven and discrete, and the quality is difficult to control

Method used

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  • Method of eliminating liquefaction in shield tunnel stratum in tunnel
  • Method of eliminating liquefaction in shield tunnel stratum in tunnel

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Embodiment Construction

[0018] In this embodiment, in a busy city with dense buildings, it is impossible to directly implement technical measures on the ground, using the construction and structural characteristics of the shield tunnel structure, and on the premise of the assembled shield structure, through the tunnel to the shield tunnel Drainage pipes are installed in the strata around the tunnel, and vacuum (increasing the pressure difference to improve the effect) is used to pump water to promote the compaction of the liquefied soil layer, improve the anti-liquefaction ability of the stratum more evenly, and achieve the purpose of eliminating liquefaction.

[0019] Such as figure 1 , figure 2 As shown, the method for eliminating stratum liquefaction in a shield tunnel in this embodiment includes the following steps:

[0020] S1. A group of annular linings 1 assembled from several concrete segments are spliced ​​sequentially along the tunnel direction to form a permanent tunnel lining, and a set...

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Abstract

The invention relates to a method of eliminating liquefaction in a shield tunnel stratum in a tunnel and aims to provide the method of eliminating liquefaction in the shield tunnel stratum in the tunnel to solve the problem of stratum liquefaction under the condition of densely covered building structures. The technical scheme of the invention is that a group of annular linings formed by assembling concrete segments are sequentially spliced into permanent linings of a tunnel along the tunnel direction, and a group of pumping holes are evenly arranged on horizontal center lines on two sides of each annular lining and the part below along the radial direction; a water pipe is arranged on each pumping hole by using the casing process, one end of each water pipe penetrates through the annular linings to extend into the liquefied stratum, multiple drainage holes are formed in the surface of each water pipe, and a filtering membrane wraps each water pipe; a rubber branched pipe is communicated with the other end of each water pipe to be connected with a vacuum pump to realize a header pipe for pumping; the vacuum pump is started, thus vacuum is formed within the liquefied stratum surrounding the annular linings, and a given vacuum 80 kPa is maintained until the underground water level within the double tunnel diameter depth range up and down left and right outside the tunnel is decreased by 7-10m; the pipe grouting is maintained to fill the drainage holes.

Description

technical field [0001] The invention relates to a method for eliminating strata liquefaction of shield tunnels in a cave, which is mainly used for eliminating strata liquefaction of shield tunnels in public transportation projects such as municipal administration and rail transit in bustling cities. Background technique [0002] During engineering construction, for public transportation facilities such as subway shield tunnels in liquefied silt or silt formations, the liquefied formations in which they are located need to be treated. So far, the elimination of liquefaction has mostly been carried out on the ground, using the ground as a working platform to treat the liquefied strata by vibratory compaction and dynamic compaction. This processing method can only be implemented in open places, and in densely populated cities, it often does not have the conditions to operate from the ground. With the development of public transportation represented by urban subways in our ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/40E21D11/10
Inventor 刘世明彭加强卢慈荣邢玉芳
Owner POWERCHINA HUADONG ENG COPORATION LTD
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