缓倾斜中厚矿体充填开采上覆岩层运移规律研究

针对缓倾斜中厚矿体下行充填开采过程中岩层移动和地表塌陷规律展开了研究.通过FLAC3D三维数值计算确定典型勘探线剖面，以河砂为骨料，重晶石粉为胶结剂进行大型相似材料模型试验，利用3DEC数值分析软件对模型试验结果进行验证分析.结果表明，充填开采能有效抑制岩层移动和地表塌陷，使地表沉降范围集中在矿体顶部且沉降中心随下行开采过程中向矿体中心移动;深埋矿体的开采对上覆岩层移动范围的影响较浅埋矿体的采动影响小;岩层移动塌落的角度随开采深度的增加先变小后变大，最终沉降以筒型陷落为主.

Study on Overlying Strata Movement Law in Backfill Mining of Gently Inclined Medium Thick Orebody

The laws of strata movement and surface subsidence during downward backfill mining of gently inclined medium thick orebody were studied. Typical exploration line profiles were numerically determined via FLAC3D. The river sand and cementing agent were adopted as the materials of the aggregate and barite powder to peform large-scale similar material model tests. The model test results were verified and analyzed via the numerical analysis software-3DEC. The results showed that the strata movement and surface subsidence can be effectively restrained by the method of backfill mining， and cause to the surface subsidence area to concentrate on the top of the orebody and move to the center of the orebody along with the downward mining process. It was also indicated that the mining of deep-buried orebody has less influence on the movement range of overlying strata than that of the shallow-buried orebody. The angle of strata movement and subsidence first decreased and then increased with the increase of the mining depth.The final settlement is mainly found to be cylindrical subsidence.