Mount Da Huangshan Large Angle Thick Coal Seam Gob Gas Occurence Dvnamics And Its Numerical Simulation Research

Our country is the earliest coal mining and coal country in the world, with the development of economy, the growing demand for coal. And coal resources are rich, resources up to 5.9 trillion tons(2014). In the national economic and social development, the coal, oil, natural gas and other important position in the energy structure in our country, but the primary life energy is still the coal resources. For a long time, the proportion of coal in energy production and consumption structure accounts for about 60%. Although in the process of energy production and consumption in recent years, the use of natural gas, wind rising, lead to the proportion of coal resources fell, but it was not until the year2012, our country the proportion of energy consumption statistics, coal consumption is still as high as 58.5%.But it is coal industry safety in China is facing a severe situation, in the process of coal production, the most harmful gas accident in coal mine safety accidents. Analysis to determine the working face and goal gas source is one of the important measures for prevention and control of gas, so for the goaf gasseepage and accumulation law research is necessary.The seventh "to" twelfth five-year "period in China,the researches are as a scientific research project, They have “the goal gas extraction technology", "goal gas extraction process and the equipment of automatic control of research" and "equalizing lead extraction goal gas control technology and equipment to the adjacent layer gas emission research", etc. As a scientific research project. Application research on mathematics model of the application of advanced technology with effusion and accumulation law of goal is prerequisite to prevent goal hidden trouble.Based on the Da Huangshan mine 735 working face as the research object,the seepage flow mechanics, porous media fluid mechanics and other disciplines,on the basis of theoretical knowledge, through field measurement and numerical simulation method of goal gas migration and accumulation rules are studied, the main topics of this thesis are as follows:(1) Through the analysis of coal seam gas in mining coal seams and coal wall according to the analysis of the occurrence state and flow state, get the basic characteristics of the coal seam gas migration;(2) The measured gas emission by element method, the gradient to determine coal seam gas emission in coal seam, the change rule of coal wall and vertical direction and the basic characteristics of coal bed methane accumulation;(3) Combined with numerical simulation, the mine 735 face gas emissionfractured zone height were analyzed, and get the working height of fractured zone, determine the best place gas extraction.