高压水射流破煤机制及技术应用研究

Study on the mechanism of coal and high pressure water jet technology

为了研究高压水射流对破煤机制以及对该技术的推广应用,本文以云冈矿为工程背景,通过理论计算、数值模拟、现场试验等技术手段对高压水射流破煤机制及技术应用进行研究。数值模拟表明,随着高压水射流与煤体作用时间的延长,高压水射流在煤体形成的坑底尺寸逐渐变大,随着后续水流的不断增加,能量不断升高,会继续对煤体进行损伤破坏。现场试验表明,钻孔累计抽采瓦斯纯量约为42 598.13 m3,与之前未进行高压水射流冲孔造穴相比,平均瓦斯抽采浓度提高3.2倍,平均抽采纯量提高7.3倍。

In order to study the mechanism of high-pressure water jet on coal breaking and the popularization and application of this technology, Yungang Mine was taken as the engineering background, theoretical calculation, numerical simulation, field test and other technical means were adopted to study breaking the coal mechanism and technology application of high pressure water jet. The numerical simulation showed that with the prolongation of the action time of the high-pressure water jet and the coal body, the size of the pit bottom formed by the high-pressure water jet in the coal body gradually became larger. As the subsequent water flow increased, the energy continued to rise and would continue to the damage coal body. Field tests showed that the cumulative gas extraction volume of the borehole was about 42 598.13 m3.Compared with the previous high pressure water jet punching and hole forming, the average gas drainage concentration increased by 3.2 times, and the average extraction purity increased by 7.3 times.