A Construction Method for High-Pressure Water-Rich Super-large Fault Weak Breccia Tunnel

A construction method and breccia technology, applied in the direction of tunnel, tunnel lining, drainage, etc., can solve the problems of unable to achieve the effect of surrounding rock reinforcement, unable to meet the requirements of tunnel drainage and water blocking, etc., and achieve significant drainage and pressure relief effects. The effect of reducing the number of holes and increasing the drainage area
CN105041325BActive Publication Date: 2017-03-22CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
Publication Date
2017-03-22

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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.
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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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