TY-JUR T1 - 影响矿石恢复和无计划稀释的因素在悬浮型开放止区位中。赞比亚Y1 - N2 - Konkola Copper Mine 4 Subs的konkola矿井轴第4号轴的案例研究是一种轨道地下矿井,应用悬浮型开放式停止(SLO)采矿方法。第4次轴希望将矿石生产从每年100万公吨产量增加到每年的每年300万吨,但在未来5年内每年为300万公吨,但矿石恢复为70%或更少,稀释20%以上。为了达到所需的年度目标300万吨矿石恢复,应从70%增加到(≥85%),稀释应从20%降至(≤10%)。尽管是最常用的地下采矿方法之一,但目前的股票具有高意外稀释的挑战。本文评价和评估了影响恢复和无计预估稀释的参数,使用相位2软件应用数值建模,建立应力环境对矿井意外稀释的影响。The input parameters for numerical modelling were: Uniaxial Compressive strength (UCS=170MPa), Geological Strength Index (GSI) =55, Young’s Modulus (E) =26000MPa, Hoek-Brown constant (s) =0.0067, Hoek-Brown constant (mi) =20 and Poisson ratio (v) =0.2 major principal stress (σ1) 39MPa, intermediate stress (σ2= 18MPa) and the minor principal stress (σ3= 15MPa). Results obtained from review of mine production records indicate that the main factors that influence unplanned dilution at Number 4 shaft are: poor ground conditions, lack of compliance to recommended stope designs, poor drilling and blasting practices, presence of geological discontinuities, adopted mining sequence of extracting high ore grade first that leads to creation of high stress blocks within the orebody and delayed mucking practice. Results obtained from PHASE 2D model indicate that total displacement of 90mm is recorded in the hangingwall hence influencing stope wall instability that leads to increased unplanned dilution. After stope extraction, it was observed that 60MPa of induced stress developed at the top right corner and 45-50 MPa at the crown pillar and right bottom corner of the stope. JF - Current World Environment JA - VL - 65 IS - 69 UR - www.a-i-l-s-a.com/article/1194/ SP - EP - PB - M3 - 10.12944/CWE.15.Special-Issue1.03 ER -