Abstract
In view of the present situation of gas occurrence in Xiaoxi coal industry, combined with the problems of high gas pressure, high content and complex geological structure in the gas control, the comprehensive gas prevention and control technology to meet the mining connection is proposed.It mainly includes the pre drainage measures of underground kilometer drill hole, through layer drilling and bedding drilling, comprehensive gas prevention technology of surface well pre drainage of coal seam gas and underground cross layer drilling area outburst prevention. The practice shows that after the implementation of comprehensive gas control measures, the residual gas content and gas pressure of coal seam are greatly reduced, and the gas control effect is remarkable. Through the comprehensive gas control technology of outburst mine, the gas control level of Xiaoxi coal industry has been significantly improved, and the number of times of gas overrun has decreased year by year.
Highlights
It is affected by the geological factors, such as the coal seam thickness and gas outburst, which is affected by the coal mine depth and gas outburst.it is necessary to strengthen gas control to ensure the production safety and sustainable development of coal mines
The No.3 coal seam of Shanxi Yangcheng Yangtai group Xiaoxi Coal Industry Co., Ltd. is characterized by maximum gas content of 15.61m3; residual gas content of 2.84m3; initial gas emission velocity of 27.8mmHg; coal firmness coefficient f = 0.51; maximum gas pressure of coal seam is 1.66mpa; adsorption constant a is 34.99m3/t, B is 1.63m3/t; porosity is 6.3%; permeability coefficient of coal seam is 3.4779m2/Mpa2·d;the attenuation coefficient of gas flow in 100m borehole is 0.035d-1
When the working face gateway drainage reaches the standard, after the excavation is completed, the directional long drilling hole is used to construct the working face gateway coal seam, and the regional outburst prevention measures are taken.Long boreholes are arranged in the coal seam for pre pumping, and the long pre pumping boreholes must cover all the gateways of the mining face.In the areas that cannot be covered by directional drilling rig, ordinary drilling rig shall be used to supplement drilling holes, so as to ensure that there is no blank area[5].By analogy, the progressive gas drainage method is used in other working faces in the east wing of the first panel to eliminate outburst
Summary
It is affected by the geological factors, such as the coal seam thickness and gas outburst, which is affected by the coal mine depth and gas outburst.it is necessary to strengthen gas control to ensure the production safety and sustainable development of coal mines. Through the analysis of coal seam occurrence conditions and gas control status in Xiaoxi coal mine, based on the summary of existing gas control achievements and main problems, the goal of comprehensive gas control is formulated. Combined with the actual situation of the mine, the comprehensive gas control technology suitable for Xiaoxi coal industry is put forward. A series of suggestions on scientific and technological progress and safeguard measures are put forward
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