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Research on anchorage density of ultrasonic guided wave detection based on COMSOL
Author: WANG Yungang,DENG Wanjiu,XU Yanru,LIU Chunsheng Time: 2020-11-11 Counts:

doi:10.16186/j.cnki.1673-9787.2020.6.25

Received:2020/02/17

Revised:2020-04-20 00:00:00

Published:2020/11/15

Research on anchorage density of ultrasonic guided wave detection based on COMSOL

WANG Yungang1,2,3,DENG Wanjiu1,2,3, XU Yanru1,2,3, LIU Chunsheng4

1.State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454000 , Henan, China;2.Coal Production Safety Collaborative Innovation Center in Henan Province, Jiaozuo 454000 , Henan, China;3.College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000 , Henan, China ;4.Wuhan Conourish Coalmine Safety Technology Co., Ltd., Wuhan 430000 , Hubei, China

Abstract:For the study of the relation between the bolt grouted density and the reflection of ultrasonic guided waves, COMSOL numerical simulation software was used to simulate the propagation of ultrasonic guided waves in anchored bolts under different frequencies and different anchorage densities. The results show that (1 ) Un¬der different frequencies, the receiving time of the reflected wave at the end of the bolt decreased gradually with the reduce of grouted density, the receiving time of the reflected wave at the end of the bolt had a good correla¬tion with grouted density (2 ) With the decrease of grouted density, the reflected waveform tended to be complex. Under the condition of 10% grouted density, the reflection superposition of guided waves between differ¬ent anchoring interfaces would affect the reading of peak time and the calculation of propagation time of guided waves in anchorage section ( 3 ) Linear fitting at different frequencies showed that the linear fitting error at 50 kHz frequency was less,which is more beneficial to detecting bolt anchoring length. The results provided a quantitative classification evaluation method for the anchorage quality of bolt

Key words:anchorage density ultrasonic guided wave detection group velocity anchorage quality COMSOL finite element

  基于COMSOL的超声导波检测锚杆锚固密实度研究_王云刚.pdf

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