摘要
采动覆岩裂隙场形态及其渗透特性的研究是防治矿井顶板水害和抽采卸压瓦斯的基础。本文综合3DEC模拟结果和前人研究成果,初步构建了"采动裂隙环形体"三维模型及其边界判别方法;结合水力学中裂隙岩体渗透率的求解方法构建了裂隙场渗透率计算模型,并通过现场实测对回风环体的渗透率进行了间接求解。研究结果表明:"采动裂隙环形体"以离层率3 mm/m为内边界,以水平变形指标5 mm/m为外边界,以断裂带最大高度为上边界;环体-垮落带的渗透率应使用Blake-Kozeny公式求解,环体-断裂带的渗透率应使用立方定律求解。实测结果表明:回风环体-垮落带的渗透率为4.43×10^(-5)^2.77×10^(-4)m^2;回风环体-断裂带的渗透率为3.81×10^(-8)^3.01×10^(-5)m^2;回风环体-断裂带渗透主方向与回风巷走向近似一致。
The research on shape and permeability characteristics of mining-induced fracture field in overlying strata is basic for prevention and control of water disaster in the roof and pressure relief gas drainage.Based on results of 3DEC simulation and previous research,a three-dimensional model of"mining fracture annular body"and its boundary identification method were preliminarily constructed.Inspired by the solution method of fractured rock mass permeability in hydraulics,the calculation model of fracture field permeability was proposed,and the permeability of return air annular body was indirectly solved through field measurement.The research results have shown that the"mining fracture annular body"has a separation rate of 3 mm/m as the inner boundary,a horizontal deformation index of5 mm/m as the outer boundary,and the maximum height of fracture zone as the upper boundary.Blake Kozeny formula should be applied to calculate permeability of annulus-collapse zone,and the cubic law should be applied to calculate permeability of annulus-fracture zone.The measured results have shown that permeability of return air annulus-collapse zone is 4.43×10^(-5)~2.77×10^(-4) m^(2),the permeability of the return air annulus-fracture zone is 3.81×10^(-8)~3.01×10^(-5) m^(2),and the main seepage direction of return air annulus-fracture zone is approximately the same to that of return air roadway.
作者
张礼
齐庆新
张勇
赵晶
王栓林
刘桂凤
ZHANG Li;QIQingxin;ZHANG Yong;ZHAO Jing;WANG Shuanlin;LIU Guifeng(Safety Branch,China Coal Research Institute,Beijing 100013,China;School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;Deep Mining and Rockburst Branch,China Coal Research Institute,Beijing 100013,China;State Key Laboratory of Coal Mining and Clean Utilization,Beijing 100013,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2021年第4期695-705,共11页
Journal of Mining & Safety Engineering
基金
国家重点研发计划项目(2017YFC0804201)
国家自然科学基金项目(51704164)。
关键词
采动裂隙环形体
渗透率
钻孔成像
渗透张量
mining-induced fracture annular body
permeability
driliing imaging
permeability tensor
