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Hydrofracturing sectional blasting fast tunnel excavation method

A segmental blasting and hydraulic fracturing technology, which is applied in blasting, tunneling, earthwork drilling and mining, etc., can solve the problems of low efficiency and slow tunneling speed in underground mines

Inactive Publication Date: 2016-11-23
TAIYUAN UNIV OF TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of slow tunneling speed and low efficiency in mine tunnels under the existing conditions, and to provide a method for rapidly tunneling tunnels by hydraulic fracturing segmental blasting

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  • Hydrofracturing sectional blasting fast tunnel excavation method
  • Hydrofracturing sectional blasting fast tunnel excavation method

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Embodiment Construction

[0015] The specific implementation manners of the present invention will be further described below.

[0016] The implementation of the above-mentioned hydraulic fracturing method for excavating a roadway by segmental blasting provided by the present invention specifically includes the following steps.

[0017] 1. Use water exploration to drill 5 boreholes on the advanced excavation surface, and the direction of the boreholes is parallel to the excavation surface; the arrangement of the four outer boreholes presents a prismatic arrangement, and the last hole is arranged in the middle of the prism. The depth of the borehole is generally about 40m. On the one hand, the borehole can detect the water situation in advance, and on the other hand, it can carry out follow-up work.

[0018] 2. In all boreholes, use a slotted drill to open several wedge-shaped ring grooves from the bottom of the hole to the hole in turn, and each wedge-shaped ring groove is separated by 5-9m. Slotted d...

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Abstract

The invention discloses a hydrofracturing sectional blasting fast tunnel excavation method. The method comprises the following steps: drilling in an advanced excavation surface, forming a plurality of wedge-shaped circular grooves in drill holes, communicating a water injection hole sealing device with a high-pressure water pump, sequentially pre-splitting the wedge-shaped circular grooves from the bottoms of the holes, loading the drill holes, which are arranged in a prism type, with cartridge, and then sealing the holes with stemming, connecting a blasting network for blasting, then injecting a chemical solution into the drill holes to realize fast excavation. According to the method, cracks generated by hydrofracturing provide multiple free surfaces, so that the development of the cracks are more sufficient, the chemical solution is further injected to react with rocks, so that the mechanical strength of the rocks is obviously reduced, the excavation speed of a tunneling machine is further quickened, dust is reduced during excavation, furthermore, the operation is simple, and the economic benefits are obvious.

Description

technical field [0001] The invention relates to a method for fast tunneling of a roadway in hard rock under a mine, in particular to a method for fast tunneling of a roadway by hydraulic fracturing and segmental blasting. Background technique [0002] In underground rock mass engineering, whether it is excavating tunnels or coal mining, it is always necessary to continuously excavate roadways to meet various technological requirements. The tunneling speed directly affects the high-yield and efficient operation of rock mass engineering. But under the current form, what generally adopted in the tunneling of rock roadway is the drilling and blasting method; And what generally adopted in half rock roadway and coal roadway is the method for the tunneling of roadheader. In recent years, with the development of coal mines, the application of smooth blasting technology and high-power roadheaders has also been well developed. However, the high strength of the rock and the difficult...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D9/10E21B43/26F42D1/00F42D3/04
CPCE21B43/26E21D9/006E21D9/10F42D1/00F42D3/04
Inventor 杨永康张彦斌康天合季春旭郭泽峰张智敏
Owner TAIYUAN UNIV OF TECH
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