The article mainly discusses tunneling when there is more gas in the coal layer,utilizing the hish layer cracks using the hole in the high layer,in this way of inhaling the next layer gas as tunneling,the problem of the gas consistency above the ordinary level in some workplace because of the gas gushing form the next layer is sloved.

Starting from the sources of the damp, the movement of the damp and the moving parameter, this paper indicates that the upper neighboring coal seam is the main source of the damp of the stope, and points out that gas extracting and discharging is the basic measure for treating the damp.

On the basis of rock mechanics and principle of the movement of overlying strata in longwall face, this paper discusses the influences of the original gas pressure, mining technical parameters, dip angle of coal seams and the features of overlying seams on the residual gas in overlying adjacent seams.

The actuality of drawing coal seam gas and the suggestions to exploit the gas in Jincheng coal bureau;

Borehole sealing mechanism and a new technology for coal seam gas pressure test:a research

Based on the analyzing of the fold and fracture influences to the coal seam gas occurrence,according to the evolution history of regional geology and tectonic characteristics in Huangling No.