Study on gob-side entry retaining in fully-mechanized longwall with top-coal caving and its application

查看全文 作　　者：Su [1,2]Hai;Bai [3,4]Jianbiao;Yan [3]Shuai;Chen [3,4]Yong;Zhang [3,4]Zizheng

机构地区：[1]School of Resources and Safety Engineering,China University of Mining and Technology;[2]Yuwu Coal Co. Ltd,Shanxi Lu’an Mining Group;[3]School of Mines,China University of Mining and Technology;[4]State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology

出　　处：《International Journal of Mining Science and Technology》索引2015年第25卷第3期,共8页

基　　金：supported by Chinese National Programs for Fundamental Research and Development(973 Program)(2013CB227905);Natural Science Foundation of Jiangsu Province of China(BK20140210) 摘　　要：Based on the engineering background of gob-side entry retaining in fully-mechanized longwall with top coal caving(GER-FLTC) on N2105 working face of Yuwu coal mine, by adopting the methods of theoretical analysis and numerical calculation, the control techniques of surrounding rocks in GER-FLTC working face are studied in this paper. The two main difficulties of stability of surrounding rocks at gob-side retained entry in fully-mechanized longwall working face are the stability control of top coal and control of large deformation of GER-FLTC working face. Interaction mechanical model between roofing and roadside backfilling in GER-FLTC is established and the equations for the calculation of roof-cutting resistance of roadside backfilling are derived. Results of numerical calculation show that the damage zones of top coal can be categorized into the delaminating zone of top coal above the backfilling, tensile damage zone of top coal above the retained roadway and shear damage zone of the upper rib of the solid coal. Stability control of top coal is the critical part to success of GER-FLTC. With consideration of large deformation of surrounding rocks of gob-side retained entry in fully-mechanized longwall, the support technique of‘‘roofing control and wall strengthening'' is proposed where high strength and highly prestressed anchor rods and diagonal tensile anchor cables support are used for top coal, high strength and highly prestressed yielding anchor rod support is used for solid coal and roadside prestressed load-carrying backfilling is constructed by high-water material, in order to maintain the integrity of the top coal, transfer load, high resistance yielding load-carrying of solid coal, roof-cutting of roadside backfilling and support,and to achieve GER-FLTC. Results from this study are successfully applied in engineering practice. 关键词：采空区侧综采入境应用长壁工作面预应力锚杆稳定性控制综放

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Study on gob-side entry retaining in fully-mechanized longwall with top-coal caving and its application

参考文献(19)

引证文献(13)

耦合文献(1280)

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