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钻孔的抽放影响半径是进行抽放方法选择、确定钻孔布置参数以及评价抽放效果的重要依据,对其准确测定对矿井瓦斯抽放具有重要意义,压降法测定钻孔的抽放影响半径是一种简单有效的方法。对压降法的测定原理及方法进行了探讨研究,并将该方法应用于岳城煤矿进行试验研究,结果表明:压降法测定钻孔的抽放影响半径是一种行之有效的方法,并确定了岳城煤矿在采用孔径94 mm的钻孔进行煤层瓦斯抽放14 d时,其抽放影响半径为3 m,这对该矿的瓦斯抽放及防治工作具有重要意义。
The radius of drainage influence of borehole is an important basis for choosing drainage method, determining drilling layout parameters and evaluating drainage effect, and is of great significance for accurate determination of gas drainage in mine, and pressure drop method for drilling drainage Affecting radius is a simple and effective method. The principle and method of pressure drop method were discussed. The method was applied to Yuecheng coal mine to carry out experimental study. The results show that the pressure drop method is an effective method to determine the radius of the borehole drainage effect, It is also of great significance for Yuecheng Coal Mine to conduct gas drainage and prevention and control work in Yuecheng Mine when drilling holes with a hole diameter of 94 mm are used for gas drainage of coal seam for 14 days.