Construction method for tunnel working face counterpressure treatment during tunnel excavation

A tunnel excavation and construction method technology, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as difficult self-stabilization of the tunnel face, formation of debris flow, collapse, etc., and achieve the effect of improving construction quality and improving construction progress

Inactive Publication Date: 2012-01-04
GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During the excavation of the tunnel, the face of the tunnel is dominated by full and strongly weathered surrounding rocks, and large water gushes appear on the face of the tunnel, and under the action of water erosion, the face of the tunnel is difficult to stabilize itself, and its slag is hollowed out by the water Cavities are formed, and when the situation is serious, collapse occurs, or the face of the tunnel is dominated by fully weathered sandstone, driven by the erosion of water, forming debris flow and mud gushing. If there is a bad situation on the face, if you wait until the face is stable before processing, the face will be hollowed out under the action of water, and most of the slag will be taken away, forming a large cavity, which will increase the difficulty of subsequent processing, thus Affected the construction quality and construction progress

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Construction method for tunnel working face counterpressure treatment during tunnel excavation
  • Construction method for tunnel working face counterpressure treatment during tunnel excavation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] like figure 1 As shown, the construction method of tunnel face back pressure treatment in tunnel excavation is applied in the excavation process of Dahuashan Tunnel. The method includes the following steps: A. Select strongly weathered or fully weathered slag in tunnel 1 A wall 3 is piled up close to the tunnel surface 2. When the mud gushing out of the tunnel surface 2 is large, pieces of stones are added to the piled cavities, and the distance between the height of the piled wall and the vault 7 is 50cm or less, the length of the wall depends on the water gushing range of the operation face, and the length of the wall must be greater than the length of the water gushing area of ​​the operation face. In this embodiment, since the entire operation face has water gushing phenomenon, the length of the wall is The width of the tunnel; B, spray concrete on the piled wall to form a curtain 4, and the thickness of the curtain 4 is 15cm; C, set a plurality of water guide pipes...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a construction method for tunnel working face counterpressure treatment during tunnel excavation, which is used when a working face is unstable with geology of fully weathered or severely weathered wall rocks and intense water gushing or mud gushing. The construction method is characterized in that the method comprises the following steps: A, building a wall with selected tunnel slag at a position close to a tunnel working face and adding flaky rubbles into the piled up tunnel slag when the tunnel working face undergoes intense mud gushing; B, spraying concrete on the surface of the built wall to form a curtain; C, arranging a plurality of aqueducts and grout pipes on the surface of the built wall; and D, adopting mixed slurry of cement and water glass to grout thebuilt wall body through the grout pipes. Because the construction method can effectively prevent a tunnel working face from being hollowed out by water during carrying out reinforcement treatment of an excavated tunnel, the formation of a greater cavity inside the tunnel working face can be avoided; and the method also improves construction quality and accelerates construction during tunnel excavation.

Description

technical field [0001] The invention relates to a treatment method for the tunnel face, especially a method suitable for fully weathered or strongly weathered surrounding rocks, and the tunnel face has large water or mud gushing, which makes it difficult for the tunnel face to self-destruct. The construction method used in the tunnel excavation to deal with the back pressure of the tunnel face under stable conditions. Background technique [0002] During the excavation of the tunnel, the face of the tunnel is dominated by full and strongly weathered surrounding rocks, and a large water gushing occurs on the face of the tunnel, and under the action of water erosion, the face of the tunnel is difficult to stabilize itself, and its slag is hollowed out by the water Cavities are formed, and when the situation is serious, collapse occurs, or the face of the tunnel is dominated by fully weathered sandstone, driven by the erosion of water, mud-rock flows are formed, and mud gushing...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/00E21D11/10
Inventor 林才奎方建勤杨红军徐一鸣雷鸣吴章华夏兼
Owner GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products