Prediction Meghod Of Dynamic Surface Movement And Deformation Based On Knothe Model And Research Of Numerical Simulation

The situation of mining under surface objects will be more obvious with coal resources rabidly reducing in China. The movement and deformation of strata and surface induced by underground mining, is a varied process. Accuracy prediction of surface movement and deformation in mining process, it plays an important role to surface projected objects. The rules of dynamic surface movement and deformation for underground mining were obtained by analysing the surface observation data, and nonlinear integration ratio of width to depth was put forward based on subsidence factor model in thick loose layer mine area, which suitably estimated the roles of loose layer in the whole overburden depth. The prediction model of dynamic surface movement and deformation was established based on the assumption of Knothe dynamic subsidence and calculation function of time influence factor c respect to mining critical degree and panel stopped time was also proposed. Revised subsidence factor was put forward based on Knothe influence function. The method of dynamic subsidence based on numerical simulation software and respected to mining critical degree and advancing rate was put forward, and corresponded algorithm was established. Asymmetry of surface horizontal displacement was discovered in loose layer mine area, and the inadaptability, volume constant in rock deformation of classical prediction model for soft rock and loose layer mine area, was pointed out. Horizontal displace prediction in soft rock and loose layer mine area was solved by numerical simulation software based on above algorithm.