多煤层开采中间岩层对覆岩移动的影响研究  

Study on effect of interburden on movement of overburden in multiple coal seams

作　　者：李杨[1] 王建鹏[1] 陈一鼎 雷明星 杨大鹏[1] 杨坤鹏 原一航 LI Yang;WANG Jianpeng;CHEN Yiding;LEI Mingxing;YANG Dapeng;YANG Kunpeng;YUAN Yihang(School of Energy and Mining Eninerng,China University of Mining and Technology Bejing,Bejing 100083,China)

机构地区：[1]中国矿业大学(北京)能源与矿业学院,北京100083

出　　处：《煤炭科学技术》2020年第4期246-255,共10页Coal Science and Technology

基　　金：国家重点研发计划资助项目(2017YFC060300204);越琦杰出学者奖励计划资助(800015Z1138)。

摘　　要：针对西部地区多煤层开采下组煤覆岩移动的问题,采用理论分析、数值模拟和现场验证的方法,研究了下组煤开采过程中,中间岩层厚度与岩性、中间岩层硬岩比例、上覆岩层与中间岩层厚度之比3个因素对覆岩移动的影响。通过理论分析计算了覆岩移动量,为工作面顶板裂隙发育高度理论计算提供了参考依据;利用数值模拟对覆岩移动及破断规律的模拟,验证了理论计算中采场裂隙发育高度及工作面硬岩破断距;最后通过现场实测顶板来压及破断数据验证了理论计算及数值模拟的有效性。研究结果表明:①提出了通过最大挠度与自由空间对比来计算裂隙带高度的方法。②工作面采高决定了顶板覆岩裂隙的发育高度,采高越大,其裂隙发育高度越大,且覆岩的性质对裂隙的发育也有明显影响。③下组煤开采过程中,上覆岩层与中间岩层厚度之比并不是控制覆岩移动的决定性因素,若中间岩层存在厚而硬的岩层,其覆岩移动剧烈程度将降低。④作为中间岩层,厚而硬的岩层的破断对上覆岩层移动起决定性影响。Based on the overburden movement of lower coal seam with multiple coal seams in western diggings,theoretical derivation,numerical simulation and field test are applied to study effect of three factors,thickness and lithology,the proportion of hard rock,the ratio of the overburden thickness to the interburden thickness,on the movement of overburden during the mining process of lower coal seam. A theoretical calculation method is put forward to calculate the roof fracture height which provides a reference for theoretical calculation of the height of fracture zone development in working face;The theoretical calculation of the height of fracture zone development in stope and the breakage distance of hard rock in working face was verified by using numerical simulation to simulate overburden movement and breakage law;Finally,the validity of theoretical calculation and numerical simulation is verified by the field measured roof weighting and breakage data. After research and analysis:①A method for calculating the height of a fracture zone by comparing the maximum deflection with the free space is proposed. ②The fracture development in the roof strata is determined by the mining height. The mining height is proportional to the development height of fracture zone,and the nature of overburden also has a significant impact on the development of cracks. ③The ratio of the overburden thickness to the interburden thickness is not the dominative factor for overburden movement. If there is a thick and hard rock stratum in the middle stratum,the overburden movement will be reduced. ④The breakage of thick and hard intermediate strata has a decisive influence on the movement of overlying strata.

关 键 词：西部地区 多煤层开采 中间岩层 覆岩移动 下组煤 

分 类 号：TD325[矿业工程—矿井建设]