The results reveals a mechanism of subsidence by mining in mines with thick aqueous soil layers and is of significance in increasing accuracy of subsidence prediction.

Based on numerical analysis with special FEM(Finite Element Method) software , the observation in-situ and the special tests in lab, the author has studied the engineering and mechanical properties, characteristic of deformation of the deep and thick water bearing unconsolidated layers in Huanghuai area, the author has also studied its application in preventing the shaft wall from failure.

By analyzing the existing problems of case pulling from super thick unconsolidated stratum,the paper put forward a series of measures or plans in case design,pulling technique,restraining stratum swell and case protection,and it was proved to be applicable.