Watery argillaceous weak cementation siltstone tunnel construction method

A technology for silty sandstone and tunnel construction, which is applied in tunnels, drainage, earthwork drilling and mining, etc. It can solve problems such as poor stability of rock mass, achieve the effects of improving its own strength, rapid construction, and ensuring reinforcement effects

Active Publication Date: 2015-01-07
CHINA RAILWAY 16TH BUREAU GRP CO LTD
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Problems solved by technology

[0006] In view of the poor stability of the rock mass during the excavation process of cement-rich weakly cemented fine sandstone tunnels in the above related technologies, the present invention prop

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  • Watery argillaceous weak cementation siltstone tunnel construction method
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[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention.

[0038] Such as figure 1 As shown, according to the embodiment of the present invention, a cement-rich weakly cemented fine sandstone tunnel construction method includes the following steps:

[0039] Step S101, before excavation, carry out dewatering treatment on the cement-rich weakly cemented fine sandstone, wherein the dewatering treatment includes full-section light well point vacuum dewatering treatment and deep well vacuum dewatering treatment;

[0040] Step S103, after dewatering the c...

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Abstract

The invention discloses a watery argillaceous weak cementation siltstone tunnel construction method. The watery argillaceous weak cementation siltstone tunnel construction method comprises the following steps that (1) before excavation, precipitation is conducted on watery argillaceous weak cementation siltstone, wherein the precipitation comprises the steps of full-section light well point vacuum precipitation and deep well vacuum precipitation; (2) after precipitation is conducted on the watery argillaceous weak cementation siltstone, the watery argillaceous weak cementation siltstone is excavated according to the pre-designed shape and the pre-designed size of a tunnel, and the watery argillaceous weak cementation siltstone tunnel is formed. The watery argillaceous weak cementation siltstone tunnel construction method has the advantages that for the watery argillaceous weak cementation siltstone tunnel, full-section light well point vacuum precipitation and deep well vacuum precipitation are conducted before excavation is conducted, the content of water in a rock stratum is reduced, the self strength of the rock stratum is improved, the reinforcing effect of the rock stratum is ensured, and the fast construction of the watery argillaceous weak cementation siltstone tunnel is achieved.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a construction method for cement-rich weakly cemented fine sandstone tunnels. [0002] Background technique [0003] Tertiary cement-rich and weakly cemented silty sandstone, the rock surface has a certain stability after excavation, but with the construction of the initial support, the rock surface gradually softens due to water seepage, and sand and mud gushes appear, and the self-stability is poor . At present, cement-rich and weakly cemented silty-fine sandstone tunnels are designed and constructed according to grade VI surrounding rock, and conventional advanced reinforcement methods (such as small conduits, large pipe sheds, etc.) still cannot achieve the expected reinforcement effect of surrounding rocks. [0004] Aiming at the problem of poor stability of the rock mass during the excavation process of the cement-rich weakly cemented fine sandstone tunnel in the above-...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21F16/02
CPCE21D9/00E21D9/001E21F16/02
Inventor 李庚许曲炳武徐志平董勤银张秀良李强柴聪斌辛明霞孙平双
Owner CHINA RAILWAY 16TH BUREAU GRP CO LTD
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