A Quantitative Solution to the Tension Replacement of Gob-side Driving in Extra-thick Coal Seam
A technology for extra-thick coal seams and solutions, which is applied in earth square drilling, special mining, surface mining, etc., can solve the problems of theoretical research and practical reports on the excavation time of gob-side roadways in extra-thick coal seams, and achieve accurate results. Effect
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[0051] Such as Figure 1-3 As shown, the first step: taking the basic roof subsidence as an index, determine the excavation time T of the gob-side roadway 1
[0052] (1) On-site investigation and indoor experiment
[0053] The 201 working face of a mine in Shanxi mainly mines 2# coal seam, with an average thickness of 15m. The immediate roof is sandy mudstone with an average thickness of 6.0m, and the basic roof is siltstone with an average thickness of 9.2m. The mine adopts fully mechanized caving mining technology for coal mining, the coal mining height is 3m, the coal setting height is 12m, and the coal recovery rate is 75%.
[0054] Laboratory experiments show that the coefficient of disintegration of the coal body is 1.3, the coefficient of dilation of the direct roof is 1.2, the modulus of elasticity of the basic roof is 4.39GPa, the modulus of viscosity of the basic roof is 85.34GPa, and the compressive strength of the caving direct roof is 63MPa. The compressive str...
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