Research On Gas Emission Law Of Blasting Driving Face In High Gas Mine

Mine accident proportion increased in blasting driving face with the increase of mining depth and complicated geological condition , the mine accident threaten safety production of mine resources. So, strengthening the research on the gas emission law of blasting driving face , the studied result has very important theoretic significance and practical value not only in directing ventilation design and excavation deployment, but also in taking some target-oriented measures for preventing gas disaster when coal roadway is excavated. This paper is focus on researching the gas emission law in blasting driving face.In order to investigate the gas emission law in blasting driving face, according to the prediction theory of different-source gas emission , the gas emission will be divided two section ,they are the gas emission of coal wall and the gas emission of fallen coal .In view of the different-source gas emission, establish the prediction mathematical model of gas emission.For the study on the gas emission law of coal wall, in view of the 1203 blasting driving face of Adaohai coal mine, by means of field measurement and analysis the coal wall methane emission quantity in blasting driving face, based on the basical parameters of coal seam occurrence and measured data ,the changes regularity equation of coal wall gas emission intensity with the exposed time of coal wall was set up. The relation between the gas emission of coal wall and the blasting driving face length, the speed of driving, the exposed time of coal wall was found. Then the calculation method of the limited time of gas emission dried up, the maximum gas emission quantity of coal wall, the driving gateway length of coal wall maximum gas emission quantity was provided,and check formula in view of the 1203 blasting driving face.For the study on the gas emission law of fallen coal,in view of the 1203 blasting driving face of Adaohai coal mine, take sample by means of the field measurement, test the gas content and the remaining gas content of fallen coal, the predicting model of the gas emission of fallen coal was set up. And the calculation method of maximum gas density was provided, and check the formula in view of 1203 blasting driving face. By means of analyzing the data of gas emission quantity ,the most gas emission quantity comes from the gas emission quantity of coal wall, the proportion of gas emission quantity of coal wall is about 88%～96% . The gas emission quantity increase with the blasting driving face length is going up.The purpose of different-source prediction is gas management.By means of analying the studied result,the article gives guiding role for the mine safety,should take the gas pre-drainage of partition-type and control the excavation footage when coal roadway is excavated.