Orthogonal design and numerical simulation of room and pillar configurations in fractured stopes  

作　　者：吴爱祥 黄明清 韩斌 王贻明 于少峰 缪秀秀 

机构地区：[1]Key Laboratory of Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines(University of Science and Technology Beijing)

出　　处：《Journal of Central South University》2014年第8期3338-3344,共7页中南大学学报（英文版）

基　　金：Projects(50934002,51074013,51104100)supported by the National Natural Science Foundation of China;Project(IRT0950)supported by the Program for Changjiang Scholars and Innovative Research Team in University of China

摘　　要：Room and pillar sizes are key factors for safe mining and ore recovery in open-stope mining. To investigate the influence of room and pillar configurations on stope stability in highly fractured and weakened areas, an orthogonal design with two factors, three levels and nine runs was proposed, followed by three-dimensional numerical simulation using ANSYS and FLAC3~. Results show that surface settlement after excavation is concentrically ringed, and increases with the decrease of pillar width and distances to stope gobs. In the meantime, the ore-control fault at the ore-rock boundary and the fractured argillaceous dolomite with intercalated slate at the hanging wall deteriorate the roof settlement. Additionally, stope stability is challenged due to pillar rheological yield and stress concentration, and both are induced by redistribution of stress and plastic zones after mining. Following an objective function and a constraint function, room and pillar configuration with widths of 14 m and 16 m, respectively, is presented as the optimization for improving the ore recovery rate while maintaining a safe working environment.Room and pillar sizes are key factors for safe mining and ore recovery in open-stope mining.To investigate the influence of room and pillar configurations on stope stability in highly fractured and weakened areas,an orthogonal design with two factors,three levels and nine runs was proposed,followed by three-dimensional numerical simulation using ANSYS and FLAC3 D.Results show that surface settlement after excavation is concentrically ringed,and increases with the decrease of pillar width and distances to stope gobs.In the meantime,the ore-control fault at the ore-rock boundary and the fractured argillaceous dolomite with intercalated slate at the hanging wall deteriorate the roof settlement.Additionally,stope stability is challenged due to pillar rheological yield and stress concentration,and both are induced by redistribution of stress and plastic zones after mining.Following an objective function and a constraint function,room and pillar configuration with widths of 14 m and 16 m,respectively,is presented as the optimization for improving the ore recovery rate while maintaining a safe working environment.

关 键 词：orthogonal design numerical simulation surface movement roof settlement stope stability room and pillarconfiguration 

分 类 号：TD853.32[矿业工程—金属矿开采]