摘要
瓦斯压力测定是煤矿瓦斯灾害防治的重要技术手段,在不具备穿层钻孔施工条件时需通过顺层钻孔测定瓦斯压力,注浆压力显著影响封孔质量进而影响测压的准确度。为此,本文围绕合理注浆压力展开针对性研究,以解决顺层钻孔瓦斯压力精准测定难题。本研究通过理论分析可知因卸压裂隙形成的漏气通道是封孔注压关键,结合达西定律建立注浆渗流模型,采用COMSOL软件模拟1.0 MPa~7.0 MPa注浆压力下的浆液扩散特征。结果显示,注浆压力达5.0 MPa时浆液扩散半径约44 cm,继续升压至7.0 MPa仅增加约1 cm,增幅约为2%,结合注浆压力与扩散半径拟合曲线计算出5.0 MPa为合理注浆压力。以晋城某矿3号煤层为工程背景,在3701工作面运输巷施工6个顺层钻孔,对比不同压力下“两堵一注”带压封孔的测压效果。研究表明,5.0 MPa注浆压力能实现顺层钻孔裂隙的有效封堵,提高瓦斯压力参数的准确度,对矿井瓦斯灾害防治具有重要工程指导意义。
Gas pressure measurement is a critical technical means for the prevention and control of gas disasters in coal mines.When cross-layer drilling conditions are unavailable,gas pressure must be determined through in-seam drilling,wherein grouting pressure significantly influences sealing quality and consequently measurement accuracy.This study therefore investigates reasonable grouting pressure to address the challenge of precise gas pressure measurement in in-seam boreholes.Theoretical analysis reveals that gas leakage channels formed by pressure-relief fractures are the key factor affecting sealing effectiveness.A grouting seepage model is established based on Darcy's law,and COMSOL Multiphysics is employed to simulate slurry diffusion characteristics under grouting pressures ranging from 1.0 MPa to 7.0 MPa.Simulation results indicate that at 5.0 MPa grouting pressure,the slurry diffusion radius reaches approximately 44 cm,while increasing pressure to 7.0MPa yields merely a 1 cm increase(approximately a 2%increment).Based on the fitting curve correlating grouting pressure with diffusion radius,5.0MPa is identified as the reasonable grouting pressure.Taking the No.3 coal seam of a mine in Jincheng as the engineering background,six in-seam boreholes were constructed in the transportation roadway of the 3701 working face to evaluate the pressure measurement performance of the"two plugs and one injection"pressurized sealing under varying pressures.The findings demonstrate that a grouting pressure of 5.0 MPa effectively seals fractures in in-seam boreholes,enhances the accuracy of gas pressure parameters,and provides significant engineering guidance for the prevention and control of coal mine gas disaster.
作者
韩宇轩
陈学习
胡嘉英
任强强
HAN Yuxuan;CHEN Xuexi;HU Jiaying;REN Qiangqiang(School of Mine Safety,University of Emergency Management,Yanjiao 065201,China;Xiangshan Coal Mine,Shanxi Shanmei Hancheng Mining Industry Co.,Ltd.,Weinan 715400,China)
出处
《华北科技学院学报》
2026年第1期85-91,共7页
Journal of North China Institute of Science and Technology
基金
国家自然科学基金项目(52174181)。
关键词
煤与瓦斯突出
顺层钻孔
两堵一注
瓦斯压力
数值模拟
围岩变形
coal and gas outburst
in-seam borehole
two plugs and one injection
gas pressure
numerical simulation
surrounding rock deformation
