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

作　　者：Su Hai Bai Jianbiao Yan Shuai Chen Yong Zhang 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》2015年第3期503-510,共8页矿业科学技术学报（英文版）

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.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 theoret-ical 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 road-side 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 pre-stressed yielding anchor rod support is used for solid coal and roadside prestressed load-carrying back-filling 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：Gob-side entry retaining in fully-mechanized longwan with top coal caving Stability control of top coalLarge deformation control Roofing control and wall strengthening 

分 类 号：TD823.49[矿业工程—煤矿开采]