Tunnel construction method for passing through weak broken surrounding rock

A technology for crushing surrounding rock and tunnel construction, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems that restrict the safety, rapid development of the urban rail transit industry, large deformation of the support system, and no obvious directionality. Improve the effect of support, strengthen anchoring, and facilitate the effect of popularization and application
CN112610255AActive Publication Date: 2021-04-06CHINA RAILWAY 20 BUREAU GRP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA RAILWAY 20 BUREAU GRP
Publication Date
2021-04-06

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Abstract

The invention discloses a tunnel construction method for passing through weak broken surrounding rock. A supporting structure of a constructed tunnel comprises a tunnel primary supporting structure for carrying out primary supporting on the constructed tunnel and a tunnel secondary lining which is arranged on the inner side of the tunnel primary supporting structure and used for carrying out secondary supporting on the constructed tunnel. The method comprises the steps that 1, an upper pilot tunnel is excavated and supported; 2, a middle pilot tunnel is excavated and supported; 3, a lower pilot tunnel is excavated and supported; and 4, tunnel secondary lining construction is carried out. According to the tunnel construction method, the constructed tunnel is anchored through expandable anchoring devices, and the overall stability of the constructed tunnel is improved; and the expandable anchoring devices are arranged at the bottom and the top of a steel arch frame in the upper pilot tunnel correspondingly, the expandable anchoring devices are arranged at the bottom and the middle of a steel arch frame in the middle pilot tunnel correspondingly, and therefore the supporting effect of primary supporting in the constructed tunnel is improved, and the overall stability of the constructed tunnel is enhanced.
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Description

technical field

[0001] The invention belongs to the technical field of tunnel engineering construction, and in particular relates to a tunnel construction method for passing through weak and broken surrounding rocks. Background technique

[0002] Due to the development of fractures in the weak and broken surrounding rock, the structural planes are intertwined and randomly distributed without obvious directionality. To a certain extent, it can be regarded as an isotropic homogeneous continuum. The overall compressive strength of the weak and broken surrounding rock is low. After excavation, the stability of the surrounding rock is poor, and the deformation is relatively large after excavation disturbance, which is very easy to lose stability and damage. Tunnel excavation on such strata can easily cause large uneven settlement. In addition, after the tunnel lining is constructed, the surrounding pressure will also produce creep or rheological deformation under the action of i...

Claims

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