摘要
为了研究覆岩破坏后形成“两带”的渗透率分布规律,根据理论推导应力-应变曲线以及采空区材料力学参数公式,建立“两带”渗透率分布模型,采用COMSOL软件分别对垮落带的渗透率分布和断裂带渗透率分布进行数值模拟。研究结果表明:垮落带渗透率呈“椭圆”分布,渗透率最大可达到1.07×10^(-6)m^(2),最小可达到1.5×10^(-8)m^(2);随着高度的增加,采空区两侧的渗透率变化幅度增加,中部的渗透率变化值较小。断裂带渗透率呈“铲状”分布,靠近工作面区域渗透率最大,断裂带的渗透率在上下隅角处最大可达到1.8×10^(-10)m^(2),垂直方向上随着高度的增加渗透率减小。研究结果可为西部典型浅埋煤层安全高效开采提供现场指导作用。
In order to study the law of permeability distribution of“two zones”formed after overlying rock failure,on the basis of theoretical deduced stress-strain curve and goaf material mechanical parameter formula,a permeability distribution model of“two zones”was established,and the permeability distribution of the caving zone and fault zone were numerically simulated by using the COMSOL software.The results showed that the permeability of caving zone had an“ellipse”distribution,the maximum permeability could reach 1.07×10^(-6)m^(2),and the minimum permeability could reach 1.5×10^(-8)m^(2).With the increase of height,the change range of permeability on both sides of goaf increased,and the change value of permeability in the middle was small.The permeability of the fault zone presented a“shovel-like”distribution,and the permeability near the working face was the largest.The permeability of fault zone could reach a maximum of 1.8×10^(-10)m^(2)at the upper and lower corners,and the permeability decreased with the increase of height in the vertical direction.The results can provide field guidance for the safe and efficient mining of typical shallow buried coal seams in western China.
作者
冯玉凤
徐志远
王毅
FENG Yufeng;XU Zhiyuan;WANG Yi(School of Emergency Management and Safety Engineering,China University of Mining&Technology(Beijing),Beijing 100083,China)
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2023年第3期59-66,共8页
Journal of Safety Science and Technology
基金
国家自然科学基金项目(52130409)。
