Study on the structure characteristics and movement laws of overlying strata with large mining height

Abstract

Based on the key stratum theory, the structure characteristics and movement laws of overlying strata with different mining height are studied. The results indicated that the area of collapsed and cracked zone is directly related to the characteristics of key stratum.The area of collapsed and cracked zone is larger than that of the same coal thickness with slicing mining and its height will rise with the enlargement of mining height. The study is the basis of solving strata control around coal face and ground sinking assessment with large mining height.