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Method for blasting closed rock of shield tunnel in complex strata

A technology of shield tunneling and composite ground, applied in the field of building construction, can solve problems such as difficulty in meeting construction requirements, high construction noise, high construction cost, etc., and achieve the effects of ensuring integrity and stability, saving time, and facilitating construction

Active Publication Date: 2011-04-27
GUANGDONG BLASTING ENG +4
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

This work is dangerous for both the workers and the project, as the collapse of the excavation face may cause injury or death to construction personnel, and may also cause excessive settlement of the ground or underwater cover at the top of the tunnel
[0016] The above treatment methods are not only huge in construction cost and difficult in construction, but also have a long construction period and great loss in project construction period, and there are many safety hazards, which are prone to safety accidents, pollute the environment, make construction noises, and disturb the people to a great extent, so it is difficult to Meet construction requirements

Method used

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Embodiment Construction

[0027] The new technology of closed rock mass blasting for shield tunneling in composite strata, the method steps are as follows:

[0028] (1): Design and hole layout: According to the geological exploration situation provided, design the drilling hole spacing, row spacing and hole depth, and adopt rectangular or plum-shaped hole layout;

[0029] First, select the edge of the rock mass or the thinner area of ​​the rock mass for hole blasting. The first blasting area squeezes the surrounding soil to form a cavity, which provides a free surface for the post-blasting area, and then proceeds to the center area of ​​the rock mass and the thicker area in turn. For drilling and blasting, rectangular or quincunx-shaped holes can be used. If the boulders are small, the one-time drilling is completed and blasting is carried out; when the boulders are large, drilling and blasting can be started from the edge of the boulders in batches. The spacing and hole layout method can be gradually...

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Abstract

The invention discloses a method for blasting closed rock of a shield tunnel in complex strata, comprising the following steps: (1) designing and arranging holes; (2) drilling holes directly on the ground or water surface; (3) checking the holes; (4) charging explosive; and (5) blasting the closed rock. The holes are directly drilled on the ground or water surface, and the explosive explodes in the closed rock in underground shield tunnel to blast the closed rock, wherein the particle size of the blasted rock meets the boring and deslagging requirements of a slag shield tunnel boring machine so that the slag shield tunnel boring machine can bore normally, the strata around the shield tunnel can not be damaged, and the medium around the shield tunnel can be kept intact and stable. The technology ensures convenience in construction, saves time, construction period and cost, is safe, efficient and environment-friendly and can be widely used for blasting the closed rock of the shield tunnel in the complex strata.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a method for blasting and crushing closed rock masses of shield tunnels in underground or underwater compound formations, including bedrock, boulders, interlayers and the like. Background technique [0002] In the construction of shield tunneling with underground or underwater composite strata, within the scope of the excavation section and in the direction of excavation extension, it is composed of two or more different strata, and these strata are rock-soil mechanics, engineering geology and hydrogeology, etc. The characteristics are very different, and have a great influence on the selection of various construction methods and their construction parameters, which may lead to the superposition of engineering hazards. [0003] In the construction of shield tunneling in underground and underwater compound strata, it is common to encounter closed rock masses (no free face, onl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/00F42D3/04
Inventor 孟庆彪竺维彬洪勇王晖谢红星钟长平黄威然鞠世键米晋生
Owner GUANGDONG BLASTING ENG
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