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针对条带充填开采上覆岩层承载结构及地表的变形规律,通过FLAC~(3D)数值模拟及现场实测进行了相应研究。结果表明:单一条带充填体不能够形成承载结构,覆岩的塑性体承载结构为相邻充填体相互作用而形成的,承载体间隔步距变化特征与覆岩中关键层有关;完全采动影响下,条带充填开采与未充填相比地表位移减小了65%,覆岩最大位移减小了35%,条带充填开采最大地表下沉量仅为未充填开采地表最大下沉量的26.8%;实测结果与数值模拟结果相近,条带充填能够有效的控制地表变形,地面变形等级为Ⅰ级别。
Aiming at the deformation of overburden strata bearing strata and surface deformation under strip filling and mining, corresponding researches were carried out by FLAC 3D numerical simulation and field measurement. The results show that the single strip filling body can not form the bearing structure. The plastic body bearing structure of the overburden rock is formed by the interaction of the adjacent filling bodies. The changing characteristics of the spacing of the bearing body are related to the key strata in the overlying strata. Under the influence of strip filling, the displacement of strip surface is reduced by 65% and the maximum displacement of cover rock is reduced by 35% compared with that of strip filling. The maximum surface subsidence of strip filling and mining is only the maximum subsidence of unfilled surface 26.8%. The measured results are similar to the numerical simulation results. Strip filling can effectively control the surface deformation and the grade of ground deformation is grade Ⅰ.