摘要
区段煤柱参数对相邻采空区间的水力联系具有显著影响,而在煤矿地下水库设计时,区段煤柱参数的确定缺乏科学理论支撑。针对上述问题,以万利一矿4-2煤盘区区段煤柱为研究对象,根据区段煤柱侧向支承压力演化规律设计煤(岩)样渗流试验,获得煤(岩)样渗透率随垂直应力的变化函数,揭示了采空区多孔介质渗透率的分布规律。在此基础上开展了区段煤(岩)柱水渗流特性的CFD数值计算,结果表明:随着采空区水位的降低、煤柱宽度的增大,采空区水流动范围和流动速度均不断减小,水位18.65、28.65、38.65 m条件下采空区水进入相邻采空区的临界煤柱宽度分别为30、50、70 m;当区段煤柱宽度小于10 m时,采空区水可以在底部煤层绕过弹性核区进入相邻采空区;当煤柱宽度超过20 m时,采空区水不能通过底部煤柱进入相邻采空区。
The district sublevel coal pillar has a significant impact on the hydraulic connection between adjacent goaf.However,in the design of underground reservoir in coal mine,the determination of district sublevel coal pillar parameters lacks scientific theoretical support.In view of the above problems,the coal pillar in section 4-2 coal panel of Wanli No.1 Mine was taken as the research object,according to the evolution law of side abutment stress of district sublevel coal pillar,the seepage experiment of coal(rock)sample was designed,the variation function of permeability of coal(rock)sample with vertical stress was obtained,and the distribution law of porous medium permeability in goaf was revealed.On this basis,the CFD numerical calculation of water seepage characteristics of district sublevel coal pillar was carried out.The research results show that with the decrease of water level in goaf and the increase of coal pillar width,the flow range and velocity of water in goaf decrease continuously,under the condition of water level of 18.65 m,28.65 m and 38.65 m,the critical coal pillar width of goaf water entering adjacent goaf is 30 m,50 m and 70 m respectively;when the district sublevel coal pillar width is less than 10 m,the water in goaf can bypass the elastic core zone in the bottom coal seam and enter the adjacent goaf;when the width of coal pillar exceeds 20 m,the goaf water cannot enter the adjacent goaf through the bottom coal pillar.
作者
智国军
刘润
杨瑞刚
秦伟
鞠金峰
ZHI Guojun;LIU Run;YANG Ruigang;QIN Wei;JU Jinfeng(Wanli NO.1 Mine,Guoneng Baotou Energy Co.,Ltd.,Ordos 017000,China;State Key Laboratory of Coal Resources and Mine Safety,China University of Mining and Technology,Xuzhou 221116,China;IoT Perception Mine Research Center,China University of Mining and Technology,Xuzhou 221116,China)
出处
《矿业安全与环保》
北大核心
2022年第2期9-15,共7页
Mining Safety & Environmental Protection
基金
国家自然科学基金项目(51604259)。
关键词
保水开采
区段煤柱
煤柱宽度
采空区水
渗流规律
绿色开采
water preserved mining
district sublevel coal pillar
coal pillar width
goaf water
seepage law
green mining
