Detection of caving zone characteristics in fully mechanized sublevel caving mining

In this paper,taking fully mechanized sublevel caving face of No.1303 in Baodian coal mine,based on the methods of drilling,hole basic point displacement and other comprehensive methods,caving zone characteristics of thick coal seam of medium hard rock in fully mechanized sublevel caving mining is detected,and its characteristics is obtained,the achievements have important significance for the improvement of resources recovery and safety production.