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Non-destructive testing and pre-warning analysis on the quality of bolt support in deep roadways of mining districts

查看全文 作　　者：Zhang [1,2]Houquan;Miao [1,2]Xiexing;Zhang [1,2]Guimin;Wu [1,2]Yu;Chen [1,2]Yanlong 高影响力作者 机构地区：[1]State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China;[2]School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China高影响力机构 出　　处：《International Journal of Mining Science and Technology》索引2017年第27卷第6期,共10页高影响力期刊 基　　金：the State Key Research Development Program of China(No.2016YFC0600705);the Fundamental Research Funds for the Central Universities(No.2015XKZD06);the National Natural Science Foundation of China(Nos.51227003,51404250,51504243,51474215,51404262 and 51323004);the Natural Science Foundation of Jiangsu Province,China(Nos.BK20150191 and BK20140213) 摘　　要：The bolt support quality of coal roadways is one of the important factors for the efficiency and security of coal production. By means of a self-developed technique and equipment of random non-destructive testing, non-destructive detection and pre-warning analysis on the quality of bolt support in deep roadways of mining districts were performed in a number of mining areas. The measured data were obtained in the detection instances of abnormal in-situ stress and support invalidation etc. The corresponding relation between axial bolt load variation and roadway surrounding rock deformation and stability was summarized in different mining service stages. Pre-warning technology of roadway surrounding rock stability is proposed based on the detection of axial bolt load. Meanwhile, pre-warning indicators of axial bolt load in different mining service stages are offered and some successful pre-warning cases are also illustrated.The research results show that the change rules of axial bolt load in different mining service stages are quite similar in different mining areas. The change of axial bolt load is in accord with the adjustment of surrounding rock stress, which can consequently reflect the deformation and stability state of roadway surrounding rock. Through the detection of axial bolt load in different sections of roadways, the status of real-time bolt support quality can be reflected; meanwhile, the rationality of bolt support design can be evaluated which provides reference for bolting parameters optimization. 关 键 词：Deep roadways BOLT support QUALITY RANDOM NONDESTRUCTIVE testing SURROUNDING ROCK stability Prediction and pre-warning
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