Construction of filling space enclosure model and simulation on blanking accumulation for double-shield filling mining

WU Yuyi; CHENG Lichao; LIU Chengyong; WANG Haixuan; LIU Wentao; ZHAO Menghua; LI Lei; SHENG Fengtian; LONG Hang; YANG Daming

doi:10.11799/ce202511016

Abstract：To reveal the enclosure mechanism of gangue filling space in double-shield solid filling mining,a geometric model of filling space enclosure was constructed using theoretical analysis and EDEM numerical simulation.The influence laws of filling height,multi-support sequential filling process,and filling step on the accumulation state of the fill mass were systematically investigated.The results show that:First,filling operation and space enclosure model for double-shield solid fill mining was constructed,and a calculation method for filling volume was proposed.The quantitative relationship between filling volume and face length,support center distance,filling interval,filling height,natural angle of repose of gangue,and discharge opening size under a single filling interval was clarified.Taking Hecaogou Coal Mine as an example,based on this calculation method,the annual gangue filling volume for two typical working conditions of"mining height 2.6 m-filling height 1.2 m"and"mining height 3.8 m-filling height 2.5 m"was calculated.Second,increasing the filling height significantly expands the gangue accumulation range but has minimal impact on the accumulation angle:when the filling height increases from 1.0 m to 1.2 m,the diameter of the gangue accumulation range expands from 3.32 m to 3.82 m,while the accumulation angle increases slightly from 28.7° to 28.9°.Third,through numerical simulations of multi-support sequential filling along the working face and filling intervals in the advance direction,the rationality of the constructed geometric model for filling space support was verified.The objectivity of"trenches"and"gullies"phenomena during the filling process was confirmed,providing theoretical support for the efficient process design of double-shield solid filling mining.