Method for judging optimal tunneling speed of roadway with outburst dangerous coal seam

A technology of driving speed and determination method, which is applied in tunnels, earthwork drilling, mining equipment, etc., and can solve problems such as reducing roadway driving speed, reducing economic benefits, and affecting mining succession

Active Publication Date: 2020-02-28
LIAONING TECHNICAL UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Since the outburst of coal and gas is affected by many factors, such as the gas pressure in the coal body, the ground stress and the strength of the coal body, etc., the roadway excavation speed cannot be increased arbitrarily when the

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  • Method for judging optimal tunneling speed of roadway with outburst dangerous coal seam
  • Method for judging optimal tunneling speed of roadway with outburst dangerous coal seam
  • Method for judging optimal tunneling speed of roadway with outburst dangerous coal seam

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Example Embodiment

[0028] The specific application process of the method of the present invention will be described in further detail below with reference to the accompanying drawings. The embodiment is the 1101 tunneling face of the 15# coal seam of Nanshan Mine.

[0029] Step 1. Nanshan Mine 15# coal seam 1101 excavation roadway is located about 600m away from the surface, the thickness is 10.7m, the solidity coefficient of the coal body is about 0.44, the roof is made of siltstone and fine sandstone, and the apparent density of the coal body is 1.4t / m 3 . The roadway is driven by blasting, the cross section of the roadway is trapezoidal, and the net section area is 7.3m 2 , The width of the roadway is 3.2m, and the height is 2.9m. The average volume force of the overburden is 24kN / m 3 , The unit volume of coal contains gas volume of 10.15m 3 . When the roadway driving speed is 2m / d, 4m / d, 6m / d and 8m / d, the on-site measurement method is used to observe the stress in the coal body in front of the...

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Abstract

The invention provides a method for judging the optimal tunneling speed of a roadway with a outburst dangerous coal seam. The stress distribution curve graph and the gas pressure distribution curve graph in the front coal body under different tunneling speeds of the roadway are obtained through on-site observation, and the function relation formula between the stress magnitude and the gas pressuremagnitude in the front region of the stress peak in the front coal body of the roadway and the distance from the tunneling working surface of the roadway is obtained through a regression analysis method. According to the function relation, the energy source of coal and gas outburst is obtained by integral method, and the energy consumed by coal breaking and moving is determined. Finally, the ratio of the energy source of coal and gas outburst to the energy consumed by crushing and moving of the coal body under different tunneling speeds of the roadway is obtained. Among the roadway driving speeds corresponding to all ratios less than 1, the fastest roadway driving speed is the best roadway driving speed with outburst dangerous coal seam. The method has the advantages of simple application, low investment cost, convenience in use, reliable judgment result and the like.

Description

technical field [0001] The invention relates to the technical field of mine safety engineering, in particular to a method for judging the optimal driving speed of roadways with protruding dangerous coal seams. Background technique [0002] Coal and gas outburst is one of the main disasters in mines. Once it occurs, it will cause serious loss of personnel and property, and seriously affect the safe production of coal mines. Because the roadway excavation in the coal seam will destroy the original pressure balance state in the coal seam, it is easy to induce the occurrence of coal and gas outburst. Occurrence of coal and gas outbursts. Therefore, when roadway excavation is carried out in coal seams with outstanding risks, low-speed tunneling is often required. However, the lower driving speed of the working face will affect the mining succession of the mine, reduce economic benefits, and increase the maintenance cost of some roadways. Therefore, it is very necessary to deter...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21F17/00E21F17/18
CPCE21D9/00E21D9/003E21F17/00E21F17/18
Inventor 张春闻天翔栾铮
Owner LIAONING TECHNICAL UNIVERSITY
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