Study on law of mine pressure in the first mining face of high-intensity mining in the first square period
As the first mining face of 12-upper coal seam,the No.301 fully-mechanized caving face of Buertai Coal Mine of Shendong Coal Group,the average daily footage in a square period reaches a high strength level of 8.35 m.To study the law of mine pressure in the first mining face of high strength mining,the joint monitoring and analysis were carried out by drilling stress meter,microseismic sys-tem,and support pressure system.Stress meter monitoring shows that the influence range of advance supporting pressure in the first min-ing face of No.301 strong mining is divided into slow influence range and severe influence range.In the range of 9 m on the main side and 7 m on the auxiliary side of the main transportation roadway,and in the range of 15 m on the main side and 5 m on the auxiliary side of the auxiliary transportation roadway and 5 m on the side of the auxiliary side,the plastic failure of the coal body is easily caused by the mining influence,and the problems of side drum and bolt failure are presented.From the microseismic monitoring and support pressure,when the working face is 40 m before and after the square,the overlying rock migrate more strongly.The closer the working face is to the square position,the stronger the overlying rock migration is.At about 30 m after the square,the roof activity is the most in-tense,and the support pressure is large.
first mining facethe first squarepropulsion speedhigh intensity miningadvance supporting pressuremine pressure moni-toring
万方数据
维普
