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| STUDY ON SEVERAL KEY ISSUES IN NONDESTRUCTIVE DETECTION OF BOLT BONDING INTEGRITY |
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Abstract The latest researches on nondestructive detection of rock bolt bonding integrity are summarized. By means of theoretical analysis and laboratory research，several key issues in nondestructive detection，i.e. end reflection，consolidation wave and dynamic response of rock bolt under loading，are discussed. With the variation of free part length of different grouted rock bolts，the fact is found that the end reflection is not very obvious when the grouted length is shorter than 3/4 wave length of input signal. If changing the grout concrete strength，the relationship between consolidation wave speed and bolt bonding integrity is achieved. In addition，the testing rock bolt response under loading and the relationship between basic frequency of dynamic response and loading level are also gained. All of these relationships are valuable in engineering practice.
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Received: 24 March 2007
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LI Botao1, 2, 3, TAN Yuxuan1, LIN Haifei4, 5*, WEI Jianping1, 2, 3, ZHANG Hongtu1, 2, 3, LI Shugang4, 5, WEI Zongyong4, 5, WANG Pei4, LUO Rongwei4, LIU Yanwei1, 2, 3. Mechanical properties and mesoscopic damage evolution of coal under liquid-nitrogen freezing at different initial temperatures[J]. , 2026, 45(6): 1757-1772. |
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