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.

The displacement angle of strata has a great bearing on the size of coal pillar for protection of buildings on very thick unconsolidated layers,and has a great economic potentials.

Study on strip mining size under thick alluvium and thin bedrock;

Approach on move character of thick alluvium;

Study on mining degree and patterns of ground subsidence in condition of mining under thick unconsolidated layers;

Study on parameters of surface movement caused by top-coal caving mining under thick alluvial soil;