Study on Law of Mining Pressure Development in Shallow Buried Deep and High Mining Face
With 85214 face of Sandaogou Coal Mine as the engineering background,the law of min-ing pressure development in shallow deep and high mining face is studied.By using the method of theoreti-cal analysis,the fixed beam model and cantilever beam model are established,and the initial pressing step distance and periodic pressing step distance of the working face are determined to be 104.91 m and 19.90 m respectively.Based on the shallow buried structure properties of overlying rock,the models of short masonry beam and step rock beam are established,and the supporting resistance is determined to be 5624 kN and 14461 kN respectively.By using the method of field test,the working resistance data of un-derground support are measured and analyzed.It is determined that the first pressing step distance of the working face is 106 m,the periodic pressing step distance is 16.8 m,the average monthly times are 11 times,the average support load is 37.5 MPa,and the abutment pressure is mainly distributed in the mid-dle area of the working face.The research results prove the rationality and effectiveness of the compression step model,and confirm that the overlying rock structure presents the fracture characteristics of short ma-sonry beam structure and step rock beam structure under shallow buried depth,which can provide a basis for mine production.
underground mineshallow deep and high mining facepressing step distanceshort ma-sonry beamstep rock beam
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