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.

Based on geological and mining conditions of Baodian Colliery and occurrence characteristic of loose aquifer,a set of successful mining experience of 1316 Full-mechanized Caving Mining Face of 1st Mining Area under loose aquifer of quaternary system was concluded here.

Based on the geological and mining conditions and occurrence characteristics of loose aquifer of Xinglongzhuang Colliery,water bursting cause of 4303 full-mechanized caving mining face under loose aquifer was analyzed,the prevention measures of the 3rd aquifer and reasonable dimension of coal pillar for sand proof were discussed in this paper.