巨厚煤层煤巷超前定向长钻孔高压注水卸压研究  

Research on high pressure water injection and pressure relief in advance directional long borehole of coal roadway in extremely thick coal seam

作　　者：崔峰[1,2,3] 高远江 李宜霏 谭立 彭宝山 师为战 胡艳波 CUI Feng;GAO Yuanjiang;LI Yifei;TAN Li;PENG Baoshan;SHI Weizhan;HU Yanbo(College of Energy Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Key Laboratory of Western Mine Exploitation and Hazard Prevention,Ministry of Education,Xi’an University of Science and Technology,Xi’an 710054,China;Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Ministry of Natural Resources,Xi’an 710021,China;State Grid Energy Xinjiang Zhundong Coal Power Co.,Ltd.,Changji 831800,China)

机构地区：[1]西安科技大学能源学院,陕西西安710054 [2]西安科技大学西部矿井开采及灾害防治教育部重点实验室,陕西西安710054 [3]自然资源部煤炭资源勘查与综合利用重点实验室,陕西西安710021 [4]国网能源新疆准东煤电有限公司,新疆昌吉831800

出　　处：《西安科技大学学报》2025年第1期35-48,共14页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学基金项目(52422404,51874231);陕西省创新能力支撑计划项目(2020KJXX-006)。

摘　　要：针对巨厚煤层煤巷掘进期间的卸压防冲合理调控问题,以准东二矿1101工作面巨厚煤层巷道掘进为背景,采用理论分析与数值模拟方法,开展超前定向长钻孔高压注水卸压研究,通过揭示巷道掘进期间冲击地压发生机制,提出定向长钻孔高压注水超前卸压调控模式,基于煤体裂缝扩展规律数值分析和湿润半径的计算,确定了巨厚煤层巷道围岩定向长钻孔卸压参数,掌握了不同卸压参数下围岩能量及塑性区演化规律,并优化钻孔合理布置参数。结果表明:围岩随着距巷帮深度增加,受力状态逐渐由一维向三维受力状态转变,局部形成高能量差造成冲击显现;当钻孔距巷帮宽7 m时,巷帮能量峰值为17.31×10^(4) J·m^(-3),相比未卸压状态超前区域,能量峰值下降幅度达10.03%;钻孔距底板6 m时,单位能量峰值梯度为1.17×10^(4) J·m^(-3),比未卸压状态超前区域能量峰值下降幅度达11.95%;不同卸压参数下,能量转移深度和梯度均呈现负相关关系,塑性区延伸深度和面积呈现正相关关系,钻孔距巷帮宽7 m,距底板深6 m时,塑性区深度和面积达到峰值,围岩的卸压效果较优;注水区域视电阻率降低幅度达到42%,注水后应力降低幅度约为12.73%,注水后围岩整体的卸压效果较好。研究结果为巨厚煤层巷道掘进期间卸压防冲提供了科学指导。In order to ensure reasonable regulation and control of pressure relief and anti-impact during the excavation of coal roadway in extremel y-thick coal seam,the roadway excavation of extremely-thick coal seam in 1101 working face of Zhundong No.2 Coal Mine was taken as an reserach object,a study of high pressure water injection and pressure relief of advanced directional long borehole was made by means of theoretical analysis and numerical simulation methods.By revealing the mechanism of rock burst during roadway excavation,the advanced pressure relief control mode of high-pressure water injection in directional long borehole was proposed,and from the numerical analysis of coal fracture propagation law and the calculation of wetting radius,the theoretical formula was used to determine the pressure relief parameters of directional long borehole in surrounding rock of extremely-thick coal seam roadway.The evolution law of surrounding rock energy and plastic zone under different pressure relief parameters was established,and the reasonable layout parameters of borehole are optimized.The results show that the stress state of the surrounding rock gradually changes from one-dimensional to three-dimensional with the increase of the depth from the roadway side,and the high energy difference is formed locally to cause the impact.When the borehole is 7 m away from the roadway side,the peak energy of the roadway side is 17.31×10^(4) J·m^(-3),and the peak energy of the leading area decreases by 10.03%over the unrelieved state.The energy peak gradient is 1.17×10^(4) J·m^(-3) when the borehole is 6m away from the floor,and the energy peak in the leading area decreases by 11.95%.Under different pressure relief parameters,the depth and gradient of energy transfer are negatively correlated,and the depth and area of plastic zone extension are positively correlated,the depth and area of plastic zone reach the peak,when the borehole is 7 m wide from the roadway side and 6 m deep from the floor,and the pressure relief effect of su

关 键 词：巨厚煤层 超前卸压 定向长钻孔 注水卸压 参数确定 

分 类 号：TD32[矿业工程—矿井建设]