千米深井固体充填采煤地表沉陷规律模拟研究

Numerical Simulation on Surface Subsidence Law in Solid Backfill Mining of Coal Mine with Depth over 1000 Meters

针对千米深井采用固体充填采煤技术后的地表沉陷问题,采用了FLAC3D数值模拟软件,分别对不同推进距离、不同充实率和不同埋深下的地表下沉情况进行了数值模拟对比分析,结果表明:埋深1000m、充实率80%时,地表工作面推进至1011m时达到充分采动,此后地表下沉情况趋于稳定;充实率增大时,地表下沉情况会随之改善,但稳定盆底沿走向方向长度始终在600 m左右;相对于埋深500 m,埋深1000m时的地表下沉程度较轻微,但稳定盆底范围和受采动影响面积较大。

Aiming at the surface subsidence in solid backfill mining of coal mine with depth over 1000 m, the surface subsidence situation under different advancing distances, filling ratios and depths were compared by FLAC3D software, so as to obtain the law of surface subsidence in this condition. The research showed that under the depth of 1000 m and the fill ratio of 80%, there would be a full surface subsidence at the mining of 1011 m, then the surface subsidence tended to be stable; with the increase of filling ratio, the surface subsidence situation would be improved, while the bottom＇s length along the direction of the sinking area would be always around 600 m; compared with the depth of 500 m, the surface subsidence was less serious when the depth was 1000 m, but the bottom of sinking area and region affected by mining were larger.