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Weak expansive clay stratum subway station tunneling construction method

A subway station and construction method technology, which is applied in the direction of earthwork drilling, underground chamber, shaft lining, etc., can solve the problems of large section span and height requirements of subway stations, difficulty in meeting station construction requirements, and large amount of tunnel floor uplift, etc. Achieve the effects of improving the force of the support structure, reducing the excavation section or span, and avoiding soil collapse

Inactive Publication Date: 2020-11-27
合肥市轨道交通集团有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the underground excavation station is located in the weakly expansive clay stratum, on the one hand, the rock-soil mass permeability coefficient of this kind of stratum is extremely small and has a certain self-supporting capacity, but it is easy to rebound and deform under disturbance conditions; on the other hand, the cross-sectional span of the subway station and The height requirement is relatively large, which makes the traditional hole pile method easy to cause a large amount of uplift of the tunnel floor when excavating the main body of the station, which not only fails to meet the construction requirements of the station, but also poses a high safety risk

Method used

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  • Weak expansive clay stratum subway station tunneling construction method
  • Weak expansive clay stratum subway station tunneling construction method
  • Weak expansive clay stratum subway station tunneling construction method

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Embodiment 1

[0042] Construction site: Hefei City, Anhui Province.

[0043] Construction target: Chengdu Station of Metro Line 5.

[0044] Target geological conditions: weakly expansive hard plastic clay and argillaceous sandstone. The permeability coefficient of rock and soil is extremely small and has a certain self-supporting capacity, but it is easy to rebound and deform under disturbance conditions.

[0045] construction process:

[0046] Due to the stratum characteristics of the construction target, the traditional hole pile method leads to a large amount of uplift of the tunnel floor when excavating the main body of the station, which cannot meet the construction requirements of the station; therefore, the present invention makes it possible to Close the loop as soon as possible, thereby reducing the amount of uplift at the bottom of the tunnel.

[0047] After carrying out detailed topography and geological condition exploration on the construction site, the scope of the excavatio...

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Abstract

The invention belongs to the technical field of tunnel engineering, and particularly relates to a weak expansive clay stratum subway station tunneling construction method. The method includes the steps of pilot tunnel construction, integral station supporting system construction, station body earth excavation and second lining structure construction. By adoption of the weak expansive clay stratumsubway station tunneling construction method, the condition of uplift deformation of the excavation face in the excavation process can be effectively restrained while the safe and smooth operation ofweak expansive clay stratum subway station tunneling construction is effectively guaranteed.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering, and in particular relates to a submerged excavation construction method for subway stations in weakly expansive clay strata. Background technique [0002] In recent years, my country's urban rail transit engineering construction has developed unprecedentedly. Constrained by traffic evacuation and the surrounding environment, submerged station excavation is a common station construction method. When the underground excavation station is located in the weakly expansive clay stratum, on the one hand, the rock-soil mass permeability coefficient of this kind of stratum is extremely small and has a certain self-supporting capacity, but it is easy to rebound and deform under disturbance conditions; on the other hand, the cross-sectional span of the subway station and The height requirement is relatively large, which makes the traditional hole pile method likely to cause a large amount of upl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/00E21D11/38
CPCE21D9/00E21D11/003E21D11/38
Inventor 陈华李孔军阮亮周仕波朱传孔夏成旭杨新安马明杰田静
Owner 合肥市轨道交通集团有限公司
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