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结合金山店铁矿张福山矿区的开采实际,借助FLAC3D三维数值模拟分析软件,对比分析了不同矿房结构参数、不同充填配比的嗣后充填法回采充填过程的采场围岩应力、变形及塑性区分布情况。研究表明:在相同充填配比下,矿柱宽度从15 m增加到18 m,矿柱承受的最大应力值由23.3 MPa减少到23.1 MPa,顶板下沉位移由22.2 mm增加到27.7 mm;充填体的强度由2.4 MPa增加到3.8 MPa,矿柱两侧围岩承受的最大应力值由16.3 MPa降低到15.9MPa,顶板下沉位移由413.4 mm减少到104.3 mm。经综合分析比较,确定合理的矿房、矿柱宽度为15 m,充填配比为1∶8。
Combined with the actual mining in Jinshangdian iron ore ZhangFuShan mining area, with FLAC3D three-dimensional numerical simulation software, the stress, deformation and plasticity of surrounding rock of the stope in the process of post-filling with different filling structure parameters and different filling parameters District distribution situation. The results show that the maximum column stress decreases from 23.3 MPa to 23.1 MPa and the roof sinking displacement increases from 22.2 mm to 27.7 mm under the same filling ratio from 15 m to 18 m. The strength of the surrounding rock increases from 2.4 MPa to 3.8 MPa. The maximum stress of surrounding rock on both sides of the pillar decreases from 16.3 MPa to 15.9 MPa. The displacement of roof sinking decreases from 413.4 mm to 104.3 mm. After comprehensive analysis and comparison, the reasonable ore mines were determined. The pillar width was 15 m and the filling ratio was 1: 8.