Method for performing coal and rock repeated hole drilling to form roadway scouring weakening preventing structure

A weak structure and roadway technology, which is applied in earth drilling, ground mining, underground mining, etc., can solve problems such as failure to eliminate rock burst disasters, achieve safe and effective prevention of rock burst, and realize simple and reduced The effect of production costs

Inactive Publication Date: 2019-10-25
CHINA UNIV OF MINING & TECH
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Problems solved by technology

Especially in some mines with severe rock burst, although various prevention and cont

Method used

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  • Method for performing coal and rock repeated hole drilling to form roadway scouring weakening preventing structure
  • Method for performing coal and rock repeated hole drilling to form roadway scouring weakening preventing structure
  • Method for performing coal and rock repeated hole drilling to form roadway scouring weakening preventing structure

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Embodiment Construction

[0025] A method for repeatedly drilling coal rocks of the present invention to form a roadway anti-scour weak structure, the specific steps are as follows:

[0026] a. During the process of constructing the roadway 4 along the excavation face 10, Figure 4 As shown, the arrow represents the direction of roadway excavation. Utilize the drilling rig to drill several pressure relief holes 5 at the designated positions of the coal rock mass respectively on the left and right sides of the roadway 4. The designated positions of the coal rock mass are determined according to the coal rock properties and the mine pressure observation records. The 5 positions are symmetrical; the interval between the orifices of the several pressure relief holes 5 is 0.8-3m; the several pressure relief holes 5 are driven into two sides of the vertical roadway; the drilling diameter of the several pressure relief holes 5 is 90-130mm, The hole depth is not less than 20m.

[0027] b. Put steel pipes 6 w...

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Abstract

The invention discloses a method for performing coal and rock repeated hole drilling to form a roadway scouring weakening preventing structure. A drilling machine is utilized for drilling a hole in anassigned position, repeated rotating is performed to fracture a coal and rock mass, a roadway scouring weakening preventing structural layer is formed, and energy released by impacting mine pressureis absorbed. According to the method, on the two edges of a roadway, hole drilling is performed to crack the coal and rock mass, a 6-12 m steel pipe is arranged in drilled holes in a sleeved manner, cracking pressure relief can be repeatedly performed on the coal and rock mass many times through the steel pipe, but a roadway supporting and protecting layer is not damaged; and meanwhile hole drilling is performed in the 6-12 m steel pipe many times to form a weak structural layer, and the energy of the impacting mine pressure is absorbed. According to the method, on the premise that the roadwaysupporting and protecting layer is effectively protected, the energy of the impacting mine pressure can be effectively absorbed, the damage degree to a roadway by the impacting mine pressure is weakened, a great significance is achieved for preventing and treating the impacting mine pressure, repeated hole drilling is a simple and effective coal and rock mass cracking method, very wide application is achieved during roadway pressure relief, and very high practical value is achieved in coal mine.

Description

technical field [0001] The invention relates to the application field of realizing weak structures in coal mine underground tunnels by using pressure relief holes for repeated cracking. In particular, the invention relates to a method for forming a weak anti-scouring structure of the roadway by fracturing coal and rock pressure relief holes in the field of coal mine underground roadway excavation and mining safety technology. Background technique [0002] According to statistics, there have been 178 mines in my country where rock burst (rock burst) has occurred. Rock burst accidents not only occur in deep mines, but also in shallow mines. With the continuous mining of coal resources, rock bursts The number of mine crushing shafts will gradually increase. Once the shock mine crushing occurs, it will cause a great threat to the life of the miners and cause huge losses to the mine. Rock burst is a dynamic phenomenon in which the original mechanical balance of the roadway and wo...

Claims

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Application Information

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IPC IPC(8): E21C41/18
CPCE21C41/18
Inventor 高明仕贺永亮赵一超张志聪李振国刘垚鑫
Owner CHINA UNIV OF MINING & TECH
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