Study On Primary Factors And Dominant Direction Of Coal Seam Sermeability In The Guhanshan Coal Mine,jiaozuo Mining Area

The permeability of coal seam is an important factor affecting the effect of coal mine gas extraction,and the permeability of coal seam has the characteristics of anisotropy.There are many factors influencing coal seam permeability and dominant position.In this paper,from the aspects of coal seam fractures and geostresses,the seepage and dominance distribution of coal seams are analyzed to find out the high coal seam permeability distribution area and permeability direction,and combine with the site coal seam permeability azimuth test to verify.It is of great significance to optimize the design of mining and to improve the efficiency of coal mine drainage.Through the observation,analysis and photographing of the ancient Hanshan mine,the paper analyzes the density of the coal seam in the Guhanshan coal mine,the good development of the fissure,the better connectivity and the small amount of filler.The direction of fissure development is NE.The dominant direction of the fissure direction in the hilly area of GuHanshan is mainly NE55 ° and NE35 °,that is,the azimuth is the advantage of coal seam permeability.Due to the different developmental orientation of coal seam,the permeability and dominance of coal seam are affected and affected,which is mainly reflected in the permeability of parallel coal seam fracture direction.The stress reduction method is used to determine the in-situ stress of Guhan Mountain by using the stress relief method,and the deformation coefficient and tectonic complexity coefficient of tectonic plane are calculated.The eastern part of the Ghushan mine is larger than that of the west,while the eastern part of the high stress region is smaller than the west.The effect of in-situ stress on the permeability of coal seam is mainly due to the different tectonic stress field in different regions.The deformation and fragmentation of coal body result in the compression or closure of the fracture,which leads to the existence of coal seam permeability and the different stress zones.The site permeability test proves that the coal seam fissure development in the eastern part of the ancient Han Shan mine is better than that in the west.The main developmental orientation of coal seam in east-west area is NE55 ° and NE35 °,which is the advantage of coal seam permeability.The stress of the eastern coal seam is smaller than that of the western area,which leads to the development of the fissure in the eastern area is better than that in the western coal seam.It also verifies that the permeability of the eastern part of the ancient hills is less than that in the western region.That is,the permeability of the eastern part of the coal seam is higher than that of the west,and the eastern part is easy to be extracted.