Study of Surface Dynamic Subsidence Model Based on Boltzmann Function

Surface subsidence appeared after coal mine mining，during subsidence process，w-t curve of surface points like inverted S type distribution，according Knothe time function，and then surface dynamic subsidence model based on Boltzmann function was put forward，the situation that model parameters should be satisfied was analyzed，the feasibility of dynamic subsidence forecast based on the model with practical data analysis，then the point B30 was applied parameters fitting，which predicated value was almost equal to practical surface subsidence value，the following model parameters were obtained，which include a=0.99，b=-136.4，c=6.803，d=371.4，association coefficient was 0.99，relative degree was high，the surface dynamic subsidence process could be illustrated rightly，it show the model has some adaptability.