Study on Mine Strata Pressure Law of Coal Mining Face in Shallow Depth Seam Under Thin Base Rock in Daliuta Mine

In order to study the mine strata pressure law of the coal mining face in the shallow depth seam under the thin base rock and to prevent the roof cutting accident occurred in the coal mining face in the shallow depth seam under the thin base rock which could cause a sand inrush or water inrush accident,with the site mine strata pressure observation in No.22614 coal mining face in Daliuta Mine,the mine strata pressure behavior law of the coal mining face in the shallow depth seam under the thin base rock was obtained.In the area with a thickness over 10 m of the overburden base rock,the pressure would be obvious and the dynamic coefficient of the powered support would be relatively high.In the area with a thickness less than 10 m of the overburden base rock,there would be no pressure in the roof of the coal mining face.The pressure of the powered support in the coal mining face would be concentrated at 5 400 ~ 7 200 kN and the present powered supports all could meet the production requirements.