Accurate Dual Evaluation Method for Outburst Prevention Effect of Deep Coal Road Strip
The disaster causing effect of deep geostress on coal roadway outburst is more prominent,which is an important factor that can not be ignored.In order to achieve accurate evaluation of outburst prevention effect in deep coal roadway strip area,the out-burst prevention effect of coal roadway strip must be double evaluated from both geostress factors and gas factors.The typical cases of deep coal roadway outburst are studied and analyzed,and the coal roadway strip is accurately divided into general dangerous normal area and serious dangerous abnormal area.Based on the expansion deformation and gas content,the stress concentration coefficient k is introduced,and the equivalent expansion deformation and residual gas content are proposed to accurately evaluate the ground stress and gas pressure relief and outburst prevention effects respectively,and the engineering application is carried out.The application shows that the in-situ stress index,gas index and verification index of drill cuttings S value and K,value are all within the standard.This method can realize double accurate evaluation of in-situ stress and gas in coal road strip area.
deep coal road stripoutburst prevention effectequivalent expansion deformationaccurate double evaluation
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