High-pressure two-alley pre-grouting method for super deep hole of large geologic structure crack coal-rock mass
A technology of geological structure and coal rock mass, applied in underground chambers, earthwork drilling, wellbore lining, etc., can solve problems such as incomplete structure of fractured coal rock mass, affecting coal mining stability, etc.
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[0044] Example 1: The coal mining face of the coal mine is rectangular, the average thickness of the coal seam is 5.8m, the mining height is 3.0m, and a layer of gangue is included, and the thickness is 0.34m. The inclination angle of the coal seam in the working face is 0° to 7°, and the Platts hardness of the coal seam is 0.98. The absolute gas emission during the mining face is 39.49m3 / min. There is a large collapse column aXn9 in front of the working face, which is 65.8 meters long in the east-west direction and 35.5 meters in the north-south direction. Broken, the maximum horizontal principal stress value of the working face test is 12.5MPa, and the direction of the maximum horizontal principal stress is The minimum horizontal principal stress is 6.95MPa, the vertical principal stress is 9.58MPa, and the maximum horizontal principal stress direction is The average strength of the coal seam is 13.78MPa, and the collapsed column will have a serious impact on the normal ...
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