高压水射流卸压防治复合动力灾害机理及应用

为研究高压水射流卸压防治复合动力灾害的可行性，以余吾煤业高瓦斯矿井东翼采区内首采N2105工作面工程地质条件为背景，通过现场调研、理论分析、数值模拟和工业性试验等方法，对N2105进风平巷两帮采取高压水射流卸压防治效果进行了研究。结果表明:对巷帮煤体采取高压水射流卸压技术，煤体在高压水射流的冲击力和扰动应力波共同作用下瞬间发生破坏；巷帮侧支承应力分布曲线由原有的“单高峰值”转变为“内低外高双峰值”，受以上支承应力变化的影响，底板煤岩体内难以形成范围较大且连续的塑性应力状态区；现场电磁辐射和矿压监测结果表明高压水射流技术对煤层卸压增透效果显著，降低了巷道发生复合动力灾害的可能性。研究结果可为同类矿井复合动力灾害的防治提供参考和借鉴。

Mechanism and application of pressure relief with high-pressure water jet to prevent and control compound dynamic disaster

In order to study the feasibility of pressure relief with high-pressure water jet to prevent and control the compound dynamic disasters,taking the engineering geological conditions of the first mining N2105 working face in the east wing mining area of Yuwu high gas mine as the background,the prevention and control effect of pressure relief with high-pressure water jet at both sides of N2105 intake entry was studied by means of field investigation,theoretical analysis,numerical simulation and industrial test.The results showed that when adopting the pressure relief technology with high-pressure water jet on the coal body at roadway side,the coal body destroyed instantaneously under the combined effect of impact force and disturbed stress wave by the high-pressure water jet.The distribution curve of bearing stress at roadway side converted from the original“single high peak value”to“low internal and high external peak values”.It was difficult to form the large and continuous plastic stress state area in the bottom coal body due to the influence of bearing stress.The field monitoring results of electromagnetic radiation and mine pressure showed that the high-pressure water jet technology had significant effect on the pressure relief and permeability enhancement of coal seam,and reduced the possibility of compound dynamic disasters in the roadway.The research conclusions can provide reference for the prevention and control of compound disasters in similar mines.