1) 39MPa，中应力(σ2= 18MPa)和小主应力(σ3= 15MPa)。对矿山生产记录的复核结果表明，影响4号井非计划贫化的主要因素有:地面条件差，不符合推荐的采场设计，钻孔和爆破实践差，存在地质不连续性，采用先提取高品位矿石的采矿顺序，导致在矿体内形成高应力块和延迟卸渣实践。 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.
