Study On Gas Geological Characteristics And Control Factors Of No.3 Coal Seam In Sima Coal Mine

The coal and gas outburst disaster is one of the main disasters in the process of coal mining,which poses a serious threat to the life and health of underground workers and the safety of production and property in mines,in order to effectively prevent and control coal and gas outburst,scholars at home and abroad have carried out systematic research on the phenomenon of coal and gas outburst,it mainly involves the physical properties of coal and rock,gas occurrence characteristics,outburst conditions and mechanism,geology and mining quality conditions,etc..At present,most mining areas in the Qinshui basin have been evaluated and studied in terms of gas geology,but the Sima coal mine in Lu’an mining area has not been systematically studied in terms of gas geology,the study on coal seam gas geological characteristics and control factors can provide basis for reasonable mine design,full utilization of gas resources,improvement of coal and gas outburst prevention and control effect and ensuring coal mine safety.In this paper,the main controlling factors of gas occurrence law and the influence of structure on gas occurrence law in 3 # coal seam of Sima Mine Field are studied by means of laboratory test,field investigation and theoretical analysis,the gas geological region is divided and the gas outburst risk is evaluated.The main findings of this paper are as follows:(1)The uniaxial and triaxial compressive strength test,seepage characteristic test,seepage characteristic test of coal seam wall rock and isothermal adsorption test of coal sample have been completed.(2)The characteristics of structure and distribution of tectonic stress field in region,mining area and mine are analyzed,the control of fault and collapse column on gas occurrence is studied,and the calculation method of gas escape is put forward,the influence of lithology and burial depth on gas occurrence in Sima coal mine is analyzed.(3)The gas geological units in Lu’an mine area and Sima Mine are divided,the gas emission rule of No.3 coal seam in Sima Mine is predicted,and the gas outburst risk is evaluated.(4)The total CBM resources and reserves abundance of No.3 coal seam in Sima Mine are calculated,and the gas resources in Sima mine are evaluated and compared with the adjacent coal mines,it provides the basis for the feasibility analysis of CBM Resources Development.The research results provide a basis for gas utilization and disaster control in Sima coal mine,and are of great significance for ensuring the safety of production in Sima Coal Mine.There are 51 graphs,14 tables and 79 references in this paper.