Mining Technical Features And Reliability Analysis Of The Contiguous Seam

Today during the mining process in contiguous seams, there are many factors leading to hidden danger, such as: the top board being tortured during the exploitation of the lower seam; the boards of the face and lanes prone to be collapsed and leak which may even cause the curbing collapsing; the serious air leak in mining face. When coal is hard, the moving pressure of the face is small and the coal wall is integrate, which make it difficult for the excavating machine to work and thus decrease the reliability of the face exploiting system and restrain increase of the economic profits and reminding chances. Consequently, there is urgent need for the improvement of the reliability and safety in mining system.As a result, this paper, with the study of cases, researches into the mining technical features and reliability in the lower face of the contiguous seam and focuses on the following points.1. With quantitative and qualitative analysis of the concept of the contiguous seam, the technical protecting measures are proposed.2. According to the features of the fully—mechanized face system in contiguous seam and repairableness in each link of thesystem, the stratum structure of reliability of the functioning system and logical structure model are established and the arithmetic structure model is given. Based on the repairable feature of each link in the system and Markov Processing Theory, reliability analysis of the mining technical system is carried out.3. To the case of 8423 mining face and 8425 mining face at Sitai mine in Datong, with close observation, the basic data of reliability standards is observed and the detailed measures for improving the weak links in the mining technical system is proposed.4. Based on the theory and principles of the reliability distribution of the system, in the method of comparably destroyable reliability ditribution of links, the reliable degree of each link in the mining technical system in the face is redistributed in combination with two distribition methods of reliability and the data of 8423 mining face.