基于矸石固体最优粒径级配的充填开采等价采高研究  

Study on equivalent mining height of filling mining based on the optimal particle size gradation of gangue solid

作　　者：李利峰 刘鹏亮 赵文华[2,3] LI Lifeng;LIU Pengliang;ZHAO Wenhua(National Energy Yulin Energy Co.,Ltd.,Yulin 719300,China;CCTEG Coal Mining Research Institute,Beijing 100013,China;Coal Mining and Designing Department,Tiandi Science&Technology Co.,Ltd.,Beijing 100013,China)

机构地区：[1]国能榆林能源有限责任公司,陕西榆林719300 [2]中煤科工开采研究院有限公司,北京100013 [3]天地科技股份有限公司开采设计事业部,北京100013

出　　处：《中国矿业》2023年第3期103-107,共5页China Mining Magazine

摘　　要：等价采高理论是分析充填开采岩层移动控制效果的重要方法。通过分析矸石固体充填开采等价采高各组成部分数值大小,得出降低矸石充填材料压缩率是减小等价采高的有效手段,而获取矸石最优粒径级配是关键。将粒径100 mm以下矸石分为五级(100~75 mm、75~50 mm、50~25 mm、25~13 mm和13~0 mm),基于连续级配理论-泰波理论,按照级配指数n=0.3~0.7设计了五组不同粒径级配方案,模拟400 m埋深覆岩应力条件下,采用内径380 mm钢制大容器装载高度为240 mm的矸石固体充填材料进行了压缩实验。结果表明:应变随轴向应力增长而增长,应变增加速率随轴向应力增长而减小,级配指数n=0.5方案应变最小。依据其应变-应力拟合关系式得到最小等价采高表达式,为分析矸石固体充填开采岩层移动控制效果提供了定量依据。The equivalent mining height theory is an important method to analyze the control effect of rock movement in filling mining.By analyzing the numerical value of each component of equivalent mining height in solid filling mining of gangue,it is concluded that reducing the compressibility of gangue filling material is an effective means to reduce equivalent mining height,and obtaining the optimal particle size grading of gangue is the key.The gangue with grain size below 100 mm is divided into five grades(100-75 mm,75-50 mm,50-25 mm,25-13 mm and 13-0 mm).Based on the continuous gradation theory-Talbal Theory,five groups of gradation schemes with different grain size are designed according to the gradation index n=0.3-0.7.Under the stress condition of overburden rock at a depth of 400 m,the compression test of gangue solid filling material with a diameter of 380 mm and a height of 240 mm is carried out.The results show that the strain increases with the increase of axial stress,the rate of strain increase decreases with the increase of axial stress,and the scheme with grading index n=0.5 has the minimum strain.According to the strain-stress fitting relation,the expression of minimum equivalent mining height is obtained,which provides a quantitative basis for analyzing the control effect of rock strata movement in gangue solid filling mining.

关 键 词：矸石固体充填材料 等价采高 泰波理论 粒径级配 应变-应力曲线 

分 类 号：TD32[矿业工程—矿井建设]