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Construction method of high-tension water-rich extra-large-section weak breccia tunnel

A construction method and breccia technology, which are applied in tunnels, tunnel lining, drainage, etc., can solve the problems of inability to meet the requirements of tunnel drainage and water blocking, and the inability to achieve the reinforcement effect of surrounding rocks, and achieve significant drainage and pressure relief effects. The effect of reducing the number of holes, reducing water pressure and water volume

Active Publication Date: 2015-11-11
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0005] At present, conventional construction methods for high-pressure, water-rich super-large fault weak breccia tunnels cannot achieve the expected reinforcement effect of surrounding rocks, and cannot meet the requirements of tunnel drainage and water blocking

Method used

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  • Construction method of high-tension water-rich extra-large-section weak breccia tunnel
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  • Construction method of high-tension water-rich extra-large-section weak breccia tunnel

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Embodiment 1

[0053] combine Figure 1-Figure 8 , taking the treatment of landslides in the fractured zone of a high-pressure, water-rich super-large fault in a tunnel as an example, and specifically describe the treatment methods and steps during tunnel construction.

[0054] A highway tunnel crosses the fault F18, the fault width is 120m, the length is 1500m, and the surface covering layer above the cave roof is 130m, which is rare in scale. The materials filled in the fault fracture zone are mainly weak breccia and fragments, etc. Most of the muddy cement is relatively dense, and the rich groundwater is pore water, with well-developed joints and fissures, and the rock mass is very broken without cementation. The F18 fault receives the recharge of the surface water in the gully and the groundwater of the mountains on both sides. The recharge source is rich, and the drainage in the tunnel reaches 8500m 3 / d.

[0055] The specific method of implementation is:

[0056] Step 1: Use advance...

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Abstract

The invention discloses a construction method of a high-tension water-rich extra-large-section weak breccia tunnel. The method includes the steps of exploring distribution of fault weak breccia in front of a tunnel face by an advanced geological forecast method; distributing L-shaped gradient drain holes in two inner sides of the tunnel, providing sector drain holes and grouting holes, and allowing upper grouting and lower drainage; providing a combined cylinder grout-stopping wall, and performing a full-face advanced chemical grouting consolidation; constructing an advanced long tube shed with a circumferential closed advanced tube shed guide wall having a foundation, distributing tapered quincunx examining drain holes to detect grouting effect, and finally excavating the tunnel. Through the use of the techniques such as three-layer stereoscopic grouting and drainage, and cement-water glass and epoxy resin sequential grouting, the problem that a high-tension water-rich surrounding rock area with loose weak breccia has ineffective grouting consolidation and non-obvious water plugging effect is solved.

Description

technical field [0001] The invention relates to a construction method of a tunnel, in particular to a construction method of a high-pressure water-rich ultra-large fault weak breccia tunnel. Background technique [0002] With the rapid development of the national economy, a large number of construction projects are in full swing. As the main form of engineering structure, tunnel engineering has been widely used in underground engineering of water conservancy and hydropower, transportation engineering, water delivery engineering, mining engineering, etc. Unfavorable geological bodies are usually encountered during the construction of tunnel engineering. The weak fault breccia formed by geological structure is a common one. Due to its low mechanical strength, good water permeability, poor cementation, and easy deformation, the filling material is Mud often becomes one of the key factors restricting engineering construction. [0003] Fault breccia, as a kind of fault fracture...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/00E21D11/10E21F16/00E21D11/38
Inventor 曹峰凌同华张胜黄阜
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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