Changeful load feature analysis of supports in longwall and large mining height fully-mechanized face of steeply dipping seam

According to the complicated loading state of suppors in large mining height face of steeply dipping seam and affcted the staolity of surrounding rockaround the mining face,the site measurement and theoretical analysis were appied to stucy and summaize change rule of the transient loading and longtime loading .n supports.The results showed that theinitial cycle and end cycle oading valueof suppors in midle area along woring face was bigg r tan thelower an uppr re次during the normal mining process and periodit weighting proc.ss the dietits characer aiong the face became even more obiousthe inbalanceof back hyrauli suppor loading was greater than the front hydrauic support and the same characterstics concluded in the end cyle and ntial cycle,the perodic weighting process and normal mining process.The changeful loading states of suppors were more obvious than in the noral mining heighn face of steeping dpping seamespecall n th upearea of working face.and the ditance of frst weighting and periodic weighting reduced significantly ve ghting intense increased clearyth cading vales f al uppors were markedly increased.