Production law and control of harmful gas in advanced deep hole pre-splitting blasting
The roof of coal seam in hard roof mine is not easy to collapse,leading to more serious rock burst disasters during mining of the working face.In order to prevent and control the rock burst disasters,the mine adopts the method of advanced deep hole breaking roof blasting for treatment.The toxic gas produced after blasting,such as CO,NO,NO2,interferes with the accuracy of coal spontaneous combustion prediction.In order to study the law of harmful gas generation after advanced deep hole breaking roof blasting in the working face of Kuangou Coal Mine,firstly,the composition of mining emulsion explosive and the content of harmful gas generated by explosion were measured,and the producing mechanism of emulsion explosive harmful gas was mastered.Then through the field measurement of the concentration of CO gas in different areas of the return air flow of the working face before and after blasting,the distribution of harm-ful gas in the working face after blasting and its influence time were verified.The results showed that the CO concentration in the return air flow increased the highest,after the pre-splitting blasting of the process roadway and coal seam,and the average influence time of the CO concentration was 4.07 h.Based on the mine gas extraction interception technology,the CO gas extraction technology was proposed.
hard roofmining emulsion explosivedeep hole breaking roof blastingharmful gas
万方数据
维普
