Method for calculating pressure step distance of shallow coal seam covered with thin bedrock
It is a technology of pressure step and calculation method, which is applied in calculation, earthwork drilling, ground mining, etc., and can solve problems such as less research, and achieve the effect of simple calculation method, strong practicability, and ensuring scientificity
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[0029] The content of the present invention will be further described below in conjunction with the actual occurrence of the 125203 working face of Anshan Coal Mine.
[0030] Anshan Coal Mine is located in the Yushenfu mining area in my country. It is a typical shallow-buried coal seam of loess maoliang landform. The lowest altitude in the area is 1075.9m and the highest altitude is 1364.5m. The drop is large. The coal seam in the area is about 20~70m deep. The topography of the valleys is more.
[0031] Theory and practice show that the overburden layer above the bedrock in Yushenfu mining area is in a semi-consolidated state, with extremely low strength, and the bedrock is strong and thin. Therefore, after the working face is mined, under the influence of the mine pressure, when the overburden When the stress is greater than the friction required for its sliding down, the overburden will be cut to full thickness with the break of the basic roof. The actual pressure on the bedrock ...
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