Research on Overlying Strata and Surface Movement Rule in Repeated Mining

摘要：  针对山东某煤矿在微山湖下重复开采3上、3下煤的问题，采用GPS-RTK技术实测了湖区地表移动变形值，运用“双端堵水器”技术采用井下打仰上孔方法，实测了3上、3下煤开采覆岩导水裂缝带发育高度，并建立了地表下沉、水平移动拟合方程。运用FLAC3D数值模拟数据建立了此煤层重复开采中间岩体与岩层移动边界函数方程表达式，揭示该煤层重复开采对地表移动与岩体移动变形特征，对水体下安全开采具重大意义，对地质采矿条件类同的矿区也有参考借鉴价值。

关键词: 地表变形, 导水裂缝带, 数值模拟, 拟合函数

Abstract:  In view of the problems of repeated mining in both the upper and lower No.3 coal seams in one mine under the Weishan Lake，Shandong Province，we measured the ground movement and deformation values of lake area with GPS-RTK technology，monitored the heights of water flowing fractured zone in the mining of both upper and lower No.3 coal seams using the technology of double-head water-stopped machine of upward drill holes under the well，and established the fitted function of surface subsidence and horizontal movement．Moreover，the functional equation of intermediate layer and strata movement boundary in the repeated mining of upper and lower No.3 seams was set up by use of FLAC3D，which reveals the characteristics of surface movement and strata deformation in repeated mining of upper and lower No.3 seams in south Shandong mining area．The study is significant for the safety mining under water，and has a certain reference value for the mining areas with the similar geological and mining conditions．

Key words: surface deformation, water flowing fractured zone, numerical simulation, fitted function