Experimental study on the ultrasonic guided wave evaluation method of the integrity of grouting bolts
The integrity of grouting bolt was tested using ultrasonic guided wave nondestructive inspection method.Ultrasonic guided wave test platform was firstly established, and pulse-echo method was applied for ultrasonic guided wave testing.Then reflected waves from upper interface of grouting bolt was studied, and the results show that the upper interface reflected waves reflection coefficient reaches its maximum value in the excited wave frequency range 0~100 kHz, when the frequency is 55 kHz, and excited wave frequency ranging from 50 to 60 kHz is suitable for bonding density testing.As the ultrasonic guided wave velocities propagation in a free bolt are faster than those propagation in the bonding section of grouting bolt, time difference between the upper interface reflected wave and bolt end reflected wave will decrease while the debond section of grouting bolt increases.As a result, by difference value of measuring time, bonding density of grouting bolt will be easily determined.
W.He J.Liu K.Zhao H.G.Li J.G.Ning
School of Resources and Environmental Engineering, Jiangxi University of Science and Technology,Ganz Jiangxi Engineering Research Center for Industrial Safety, Nanchang, Jiangxi,China State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing,
国际会议
The 3rd ISRM Young Scholars Symposium on Rock Mechanics(第三届国际岩石力学青年学者论坛)
北京
英文
749-752
2014-11-08（万方平台首次上网日期，不代表论文的发表时间）