Analysis of Surface Deformation Induced by Backfill Mining Considering the Compression Behavior of Gangue Backfill Materials

Coal gangue, as a solid waste produced in the coal mining process, can be disposed by being prepared into backfill materials and then filled underground goafs, thus controlling strata movement surface subsidence. However, gangue are non-continuous; therefore, research deformation induced should consider creep compression behavior of materials. The took panel Tangshan Mine (Tangshan City, Hebei Province, China) background. In addition, broken was collected field to prepare specimens materials, their properties were measured. corresponding constitutive equation established embedded numerical software, FLAC3D. By building model for mining, above under conditions different durations simulated evaluated. two measuring lines arranged on monitor changes After subsidence stabilized, maximum 163.4 mm, which satisfied fortification criterion buildings. This means did not affect nearby results provide theoretical basis predicting its effective control.