Suitable layout of gate roads related to slice mining in an ultra-thick unstable coal seam  

作　　者：Fan Gangwei Zhang Dongsheng Zhou Lei 

机构地区：[1]School of Mines, China University of Mining ＆ Technology, Xuzhou 221116, China [2]State Key Laboratory of Coal Resource and Mine Safety, Xuzhou 221008, China [3]Xuehu Coal Mine, Shenhuo Group, Yongcheng 476600, China

出　　处：《Mining Science and Technology》2011年第4期563-566,共4页矿业科学技术（英文版）

基　　金：provided by the Research Fund of the Fundamental Research Funds for the Central Universities of China University of Mining & Technology (No. 2010ZDP02B02);the State Key Laboratory of Coal Resources and Mine Safety (No.SKLCRSM08X2);the Jiangsu "333"High Qualified Talents;the National Natural Science Foundation of China (Nos. 50904063 and51004101);the Scientific Research Foundation of China University of Mining & Technology (Nos. 2008A003 and 2009A001)

摘　　要：We determi：ned a suitable gate road layout in slice mining in an ultra-thick unstable coal seam, using theoretical anallysis and numerical calculations. Based on plasticity theory in terms of limiting equilibrium, the width of chain pillar in the upper slice was calculated to be 18 m. The stress distribution in the chain pillar after the upper slice was mined out was described with numerical simulation. The extent of the effect of stress on the upper chain pillar on the lower solid coal was obtained on the basis of an elastic solution of a distributed force loaded on a half-plane. Three layout designs for lower gate roads were pro- posed and a stability factor was introduced to analyze the stability of the lower pillar with numerical calculation. Gate road translation was determined as the most suitable layout method, which maximizes the extraction rate on the basis of the pillar stability.We determined a suitable gate road layout in slice mining in an ultra-thick unstable coal seam,using theoretical analysis and numerical calculations.Based on plasticity theory in terms of limiting equilibrium,the width of chain pillar in the upper slice was calculated to be 18 m.The stress distribution in the chain pillar after the upper slice was mined out was described with numerical simulation.The extent of the effect of stress on the upper chain pillar on the lower solid coal was obtained on the basis of an elastic solution of a distributed force loaded on a half-plane.Three layout designs for lower gate roads were proposed and a stability factor was introduced to analyze the stability of the lower pillar with numerical calculation.Gate road translation was determined as the most suitable layout method,which maximizes the extraction rate on the basis of the pillar stability.

关 键 词：Ultra-thick coal seam Slice mining Gate road Coal pillar Stability factor 

分 类 号：TU984[建筑科学—城市规划与设计] TD82[矿业工程—煤矿开采]