Abstract:
Coal mining in high groundwater areas leading to mining subsidence ponds. Reclamation works are of a low-percentage of reclaimed farmland, difficult construction work condition, and high reclamation cost manner, because of relatively flat terrain, and the shortage of filling materials in plain mines. Therefore, it is an efficient manner to strip the topsoil before surface inundated and reuse it while subsidence became stable. This paper taking a longwall panel in Shandong province as case study, dynamic mining subsidence was simulated by employing mining subsidence prediction software, subsidence development and its affects to farmland was illustrated subsequently. The ground was firstly divided into 7875 cells by 40m×40m, by integrating the pre-mining topography, mining subsidence and water logging time for each cell was then calculated. Based on the simulations, 461 cells were involved in topsoil removal, furthermore, the removal time, scope, and depth of topsoil was determined accordingly. The stripped topsoil could be reused subsequently. The research could benefit the development of concurrent mining and reclamation technology in underground mining sites, and promoting the synchronization of exploitations and treatments.