Study On The Outburst Prediction Sensitive Index In Heading Face Of Xuehu Mine Field

At present,the mining depth in Xuehu Coal Mine has exceeded 800 m,and the geostress in deep minefield,gas content and gas pressure are higher,and at the same time torsional small fault are more developed,and dynamical phenomena of coal and gas is more frequent,therefore,it is of great significance for ensuring the safe production of coal mine to accurately predict the outburst hazard.At present,Xuehu mine directly uses the index and critical value of Provisions on prevention of coal and gas outburst to predict outburst hazard,and the sensitivity of index and the rationality of the critical value need to be investigated and optimized.This paper summarizes the source and consumption of energy in the process of outburst,and analyzes the effects of gas,in-situ stress,properties of coal and geological structure in the outburst process,and analyzes the factors affecting the index`s measurement value of drillings volume,initial velocity index of borehole gas emission and gas desorption index of drill cuttings;and researches the outburst influencing factor in Xuehu mine,such as law of gas-geology,in-situ stress,coal properties and distribution law of tectonic coal,and analyzes main controlling factors of outburst combined with the outburst features of mine;Then according to the investigation data of sensitive index and combined with gas,in-situ stress,physical and mechanical properties of coal and main controlling factors of outburst in Xuehu mine,qualitatively analyzes the sensitivity of the investigation index,and quantitatively analyzes the sensitivity based on the grey correlation analysis method,and finally it is found that the index of drillings volume is the most sensitive,and the initial velocity index of borehole gas emission is the second,and the gas desorption index of drill cuttings is the least sensitive;In the outburst prediction,the drilling cuttings quantity index can be taken as the main index,and the initial velocity index of drilling gas emission is taken as the auxiliary index.