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
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[0028] The specific application process of the method of the present invention will be described in further detail below in conjunction with the accompanying drawings. The embodiment is the 15# coal seam 1101 driving face of Nanshan Mine.
[0029] Step 1. The coal seam where the 15# coal seam 1101 of the Nanshan Mine is located is about 600m from the surface, the thickness is 10.7m, the solidity coefficient of the coal body is about 0.44, the roof is siltstone and fine sandstone, and the apparent density of the coal body is 1.4t / m 3 . The roadway is excavated by blasting, the cross section of the roadway is trapezoidal, and the net sectional area is 7.3m 2 , the width of the roadway is 3.2m, and the height is 2.9m. The average body force of the overlying strata is taken as 24kN / m 3 , the gas volume per unit volume of coal body is 10.15m3 3 . When the roadway excavation speed is 2m / d, 4m / d, 6m / d and 8m / d, the stress in the coal body in front of the roadway is observed by th...
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