An Analysis Of Mining Method Of Steep-incline Seam And Its Ground Pressure Control

Mining method in steep seam has been a difficult issue for mining technology. For a long time, the existing research whith the domestic and foreign experts obtain succesful developments. Whereas the particularity of the condition mining in the steep seam,it,s main obstacle is mining method for the improving of mechanization, economical targets and safety condition and so on.For solve the practical problem, This paper take the field investigation, theory analysis and research and so on. Analysis and observation of face underground pressure, and carry out mining technology and strata pressure behavior in the steep. And carry out realistic and feasible program aim at main problem in the in Mining Process. It provide a guidance about practices on mine safety and production of steep seam, and it will increase enterprise economic benefit, and promote development on mining method in steep seam.This paper obtains the following importance results and achievements.1) Classification method on the basis of the proposed on mining method in steep seam, and then is classified.2) During mining high and extra-high seam,the top coal caving using tunnel is preferred to use. And mining the thin and medium thick seam, the pseudo-sloping flexible shield mining method is first to use.And appropriate parameter in mining area and working face is increased.3) Compare up tunnel with down tunnel of the working face with in steep seam,the up tunnel's deformation of roof and floor , velocity of convergence between roof and floor, the accumulation of the tunnel's displacement, rate of convergence for the section,all are less than the down tunnel's. The stability of the up tunnel is well than the down tunnels.4) The second support must be strengthen front of the working face from 10 to 20 meter in steep seam for ensure the roadway can be normal used.5) Along the incline of working face,the characteristics of rock pressure in the middle of working face is more intense, secondly is in the up end of, lastly is in the down end of the working face.6) It is more difference for periodic weighting of different location for the working face. Periodic weighting of the two ends in the working face is smaller than in the middle of working face. When the periodic weighting is appear, dynamic load coefficient for support of the down end working face is 1.15～1.43, and in the middle of working is 1.3～1.66, average is 1.49.(7)When the periodic weighting of the working face isn't obvious, the interval of periodic weighting is 9～17 meter, average is 11.8 meter.