Study on mining subsidence law of coal seam with thick overlying loess stratum

In order to have an influence law of loess to mining subsidence,combination with mining and geological conditions of thick loess stratum in Bingchang Minin g Area,based on a slicing transmission theory,a stage solution method was applied to the correction on probability integral formula of surface ground subsidence. From a |o ading view of soil stratum to a base rock,a definition of thick loess was provided. Based on geological condition of Dafosi Mine as a model,a physical material similar simul ation and FLAC3 Dnumerical simulation method were applied to have main parameters of surface ground movement caused by the mining in Bingchang Mining Area. The s tage solution method was applied to calculate the related parameters of surface ground movement in the miming area. The surface ground movement parameters were app lied to design a strip mining plan under surface building group of Tingnan Mine. The result showed that the stage solution method of the surface ground subsidence was an effective method to predict the surface ground subsidence of the thick loess.