The Research On The Law And Technology Of Prevention And Control Of Spontaneous Combustion Of Steep Seam Oblique Slicing Mined-out Area

In recent years, the mining depth and the coal bed pitch in our country are increasing gradually. Some mines use oblique slicing to layout coal face to prevent the disadvantage caused by the rock burst and to improve the production and profile, while it also brings about the risk of spontaneous of goaf which seriously affects the safety of production on the working face. Therefore, it is very important to learn the law of spontaneous of golf to prevent and control the goaf fire.As for the large inclined angle face, the complexity of the arrangement of roadways and the situation of a large degree of losing coal on the sides of working face while irregular inside and the complexity of the air leakage situation. First, as in this paper, I used a mix of experiment research and theoretical research to calculate the goaf float coal spontaneous combustion limit parameter. Then I did some research on the law of air leakage appeared in the process of work on working face through numerical modeling and obtained the law of air leakage in large inclination coal seam diagonally layered full-mechanized caving mining goaf,to divide the three zones of gob of 1411 working face through the the goaf float coal spontaneous combustion limit parameter and the result of observation on the spot, and determine the spontaneous hazardous area and minimum safety advancing speed and come up with the law of large inclination coal seam diagonally layered full-mechanized caving mining goaf. On this basis, aiming to Huangfeng mines,I suggested build the preventing and forecasting system of goaf fire and the method mainly relying on putting into inert gas,betting colloid and liquid CO2 to put out the fire. At last, I tested the effect of fire prevention and control during the stop of mining on working face and proved the effectiveness of those fire prevention and control techniques and measures, prevented the possibility of fire in the goaf of 1411 working face and make sure that the working face would leave working face safely.