Analysis on the Influencing Factors and Prediction Sensitivity of the Initial Velocity of Gas Emission from Boreholes

Abstract

The initial velocity of gas emission from boreholes is one of the main indicators for the prediction of the outburst hazard of the working face and the effect detection. Only by fully grasping the various factors affecting the initial velocity of gas emission from boreholes and continuously improving and perfecting the measurement method of the indicators can the test results be guaranteed, so that can accurately grasp the coal face outburst dangerous degree, thus improving the safety and reliability of prediction. In this paper, through the numerical analysis of the testing method of the initial velocity of gas emission from the borehole and the numerical analysis of the test results, various factors affecting the initial velocity of gas emission from the borehole are found, and the sensitivity of the prediction results of the initial velocity of gas emission from the borehole is further analyzed. Therefore, a technical way to improve the accuracy of the initial velocity of gas emission from the borehole was found. The analysis results show that the initial velocity of gas emission from boreholes is only suitable for coal seams or areas where the permeability of the coal seam is not small and changes little; when the gas pressure in the coal seam is small, the initial velocity of gas emission from boreholes is used to predict the geostress as the dominant factor The prominence of the prominence has poor prediction sensitivity; when measuring on site, the predicted borehole depth should enter the plastic deformation zone in the stress concentration zone, and high-quality and responsible test personnel should be assigned.