摘要：Based on the elastic thin plate theory,the main law of the ore roof failure was analyzed and the formula of the ore roof thickness was *** results show that the tensile stress in the roof center acco.nts for the roof *** to the limit failure co.ditions of the point,the formula of the ore roof thickness was *** No.10 stope of a bauxite mine as an engineering case,the optimal thickness of the ore roof was 0.36 *** safety factor was taken as 1.3,therefore the design thickness was 0.5 *** the whole industrial test process,the dynamic alarm devices did not start the alarm and the ore roof was not *** with other stopes under similar co.ditions,its thickness was reduced by 0.1-0.3 *** reco.ery rate of the ore roof was increased by 16.7%-37.5%.