不同厚度矿柱下崩落法充填法联合开采交错区的地压规律

The Ecotone Law of Ground Pressure for Combined Mining with Caving Method and Filling Method Under Pillars with Different Thicknesses

夏甸金矿目前采深已远超800 m,-652 m水平至-692m水平主要采用无底柱分段崩落法和进路式上向水平分层充填法联合开采,地质勘探线529～546线之间采用崩落法开采,两翼（529线以南和546线以北）采用充填法开采。通过FLAC3D软件分析不同厚度预留矿柱下采场的应力、位移、塑性区等,确定矿柱最优宽度,保障联合开采的稳定。研究发现无底柱分段崩落法采场与上向水平分层充填法采场之间存在相互影响,上向水平分层充填法采场的开采使得无底柱分段崩落法进路中垂直方向应力增大,而上向水平分层充填法采场在向上回采过程中,岩体中应力逐渐增加。在两采场之间保留一定宽度的矿柱能有效减小两采场之间的相互影响,矿柱宽度应大于15m。

Xiadian Gold Mine is currently mined with depth far exceeded 800 meters.The combined mining with non-pil- lar sublevel caving method and upward horizontal slicing backfill method was mainly used in -- 652 -- 692 m. The sublevel caving mining was used between 529 - 546 geolog- ical line, and the two wings （the south of 529 line and north of 546 line） were mined by the filling mining method. Then, the stress, displacement, plastic zone and other factors of the stope under reserved pillars with different thicknesses were analyzed by FLAC3D software, so that the optimum width of pillar was determined, and the stability of the com- bined mining was guaranteed. Studies found that the stopes respectively mined by above two methods influenced each other. The mining of upward horizontal slice stoping caused the stress increasing along the vertical direction in the route mined by non-pillar sublevel caving method, and the stress in rock mass increased gradually during the upward stoping in the stope mined by upward horizontal slicing backfill method. Retaining a pillar with certain width between two stopes can effectively reduce the mutual influence, and the pillar width should be greater than 15 m.