极近距煤层(群)共采类型划分及夹层稳定性分析  

Classification of co-mining types and stability analysis of interlayer in extremely close coal seams

作　　者：王志强[1,2,4] 石磊 武超[1] 吕文玉 孙中文[3] 罗健侨 黄鑫 苏泽华 WANG Zhiqiang;SHI Lei;WUChao;LYU Wenyu;SUN Zhongwen;LUO Jianqiao;HUANG Xin;SU Zehua(School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;State Key Laboratory of Coal Resources in Western China,Xi'an University of Science and Technology,Xi'an,Shaanxi 710054,China;Tongmei GuodianTongxin Coal Mine Co Ltd,Datong,Shanxi 037000,China;National Demonstration Center for Experimental Safe Coal Mining and Geological Guarantee Education,China University of Mining and Technology,Beijing,Beijing 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 [2]西安科技大学西部煤炭绿色开发国家重点实验室,陕西西安710054 [3]同煤国电同忻煤矿有限公司,山西大同037000 [4]中国矿业大学(北京)煤炭安全开采与地质保障国家级实验教学示范中心,北京100083

出　　处：《采矿与安全工程学报》2021年第3期458-468,478,共12页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金面上项目(52074291,51774289);国家自然科学基金青年科学基金项目(51404270);西部煤炭绿色安全开发国家重点实验室开放基金项目(SKLCRKF1903);中央高校基本科研业务费专项资金项目(2011QZ06)。

摘　　要：本文以官地矿极近距离8#和9#煤层为研究对象,针对矿井单一分层开采难以达到矿井生产能力、前期8#煤开采未铺网引起9#煤生产出现的顶板破碎以及矿井生产效率低等问题,提出一种采煤方法"近距煤层一次全厚开采巷道布置系统"(错层位巷道布置系统)进行工作面回采。工作面两端巷道,一个沿顶板布置,一个沿底板布置,利用沿顶巷道对夹矸厚度进行探测判断是否能够煤层群联合开采。对8#煤(顶煤)冒放性进行模糊性评价的结论表明顶煤能较好地放出。建立夹层力学模型分析,得到夹层厚度不大于2.5 m时利于顶煤冒放。对常规综放开采和错层位开采进行数值分析对比,认为错层位巷道布置在起坡段对夹层和顶煤造成更大破坏,并且在现场支架升降架的过程中对顶板夹层和顶煤会有更大的扰动作用,加速顶煤的冒放。综上所述,认为错层位开采从根本上改变两层煤之间的夹层的受力情况,更加利于极近距离煤层顶煤的冒放。With extremely close coal seam 8 and 9 of Guandi mine as research object, in view of difficulty in single-layer mining satisfying production capacity and the low productivity caused by unlaid net in coal seam 8 and roof in coal seam 9 in the initial stage, a coal mining method was proposed, i.e., roadway layout system for full-thickness mining in close coal seams(staggered roadway layout system) for working face mining. The roadways at both ends of the working face are arranged along the roof for one end and along the floor for the other. Therefore, the function of inclined section in the working face of making the shearer cut and the ability of along-roof roadway to detect and fracture the thickness of th interlayer can be used to determine whether coal seam groups can be jointly mined.Secondly, fuzziness evaluation of coal seam 8 was made, which certified better mining of top coal. And the establishment of interlayer mechanical model has shown that the thickness of the interlayer not more than 2.5 m is conducive to top coal caving. Finally, the numerical analysis and comparison of conventional fully mechanized caving mining and staggered-level mining has shown that the staggered-level roadway arranged in the uphill section causes greater damage to the interlayer and roof coal, and the roof interlayer and top coal have a greater disturbance to and accelerate the caving of top coal. In summary, it is believed that the mining of staggered layers fundamentally changes the stress situation of the interlayer between the two layers of coal, which is more conducive to the top coal at extremely close distances.

关 键 词：极近距离煤层 一次全厚开采 错层位采煤法 顶煤冒放性 夹层 

分 类 号：TD322[矿业工程—矿井建设]