充填条件下采空区稳定性分析

Analysis of Goaf Stability Before and After Backfill

对某矿山采空区稳定性进行了分析。首先对采空区现状进行了详细调查,明确其分布状态及体积;其次,基于FLAC3D模拟结果评价采空区现状及充填后的稳定性变化规律。结果表明,矿山主要存在5个采空区,分布在700~860 m中段,采空区总体积约40.45×10^(4)m^(3);当前采空区顶板不稳定,存在较大垮落风险,1^(#)~4^(#)采空区之间未贯通的岩体受力集中,塑性区贯通,有可能产生大规模失稳破坏;对700~820 m中段之间采空区逐步充填后,采空区失稳风险逐渐消除,不会影响700 m以下中段生产活动。建议优先对1^(#)~4^(#)采空区进行充填处理,降低采空区垮塌和贯通的风险。

The stability of goafs in a mine was analyzed.Firstly,the current situation of the goafs was investigated in detail to clarify the distribution and volume of goafs.Secondly,the stability variation of goafs before and after backfill was evaluated based on the FLAC3D simulation results.It is found that there are five main goafs in the mine,which are distributed in the middle section of 700-860 m,with total volume of around 404500 m^(3).Currently,the roof of goaf is unstable,posing a greater potential risk of collapse.The rock mass that is not connected together from 1^(#)to 4^(#)goaf has concentrated force on it and a plastic zone penetrates through,possibly causing large-scale instability.After the goafs in the middle section of 700-820 m are gradually backfilled,the risk of goaf instability can be gradually eliminated,and production activities in the middle section below 700 m won′t be affected.It is recommended that 1^(#)-4^(#)goafs should be preferably backfilled to reduce the risk of roof collapse and penetration.