Experimental and numerical studies on group velocity of ultrasonic guided waves in rock bolts with different grouted ratios

Jung Doung Yu; Yong Hoon Byun; Jong Sub Lee

doi:10.1016/j.compgeo.2019.103130

Experimental and numerical studies on group velocity of ultrasonic guided waves in rock bolts with different grouted ratios

Jung Doung Yu
, Yong Hoon Byun
, Jong Sub Lee^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

30 Citations (Scopus)

Abstract

Nongrouted parts of rock bolts can adversely affect the stability of tunnels and rock slopes. The objective of this study is to evaluate grouted ratios of rock bolts using ultrasonic guided waves. Experimental and numerical models are composed of three-layered (steel bar, grout, and concrete) rock bolts that can provide accurate propagation characteristics of ultrasonic guided waves. Group velocities of ultrasonic guided waves are analyzed using wavelet transforms. Experimental and numerical results show that group velocities decrease with increasing grouted ratio. Results of this study demonstrate that group velocity can be used as an indicator for evaluating grouted ratios of rock bolts.

Original language	English
Article number	103130
Journal	Computers and Geotechnics
Volume	114
DOIs	https://doi.org/10.1016/j.compgeo.2019.103130
Publication status	Published - 2019 Oct

Bibliographical note

Funding Information:
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning ( NRF-2017R1A2B3008466 ).

Publisher Copyright:
© 2019 Elsevier Ltd

Keywords

Grouted ratio
Integrity
Numerical analysis
Rock bolt
Ultrasonic guided waves
Wavelet transform

ASJC Scopus subject areas

Geotechnical Engineering and Engineering Geology
Computer Science Applications

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10.1016/j.compgeo.2019.103130

Cite this

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title = "Experimental and numerical studies on group velocity of ultrasonic guided waves in rock bolts with different grouted ratios",

abstract = "Nongrouted parts of rock bolts can adversely affect the stability of tunnels and rock slopes. The objective of this study is to evaluate grouted ratios of rock bolts using ultrasonic guided waves. Experimental and numerical models are composed of three-layered (steel bar, grout, and concrete) rock bolts that can provide accurate propagation characteristics of ultrasonic guided waves. Group velocities of ultrasonic guided waves are analyzed using wavelet transforms. Experimental and numerical results show that group velocities decrease with increasing grouted ratio. Results of this study demonstrate that group velocity can be used as an indicator for evaluating grouted ratios of rock bolts.",

keywords = "Grouted ratio, Integrity, Numerical analysis, Rock bolt, Ultrasonic guided waves, Wavelet transform",

author = "Yu, \{Jung Doung\} and Byun, \{Yong Hoon\} and Lee, \{Jong Sub\}",

note = "Funding Information: This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT \& Future Planning ( NRF-2017R1A2B3008466 ). Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

year = "2019",

month = oct,

doi = "10.1016/j.compgeo.2019.103130",

language = "English",

volume = "114",

journal = "Computers and Geotechnics",

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T1 - Experimental and numerical studies on group velocity of ultrasonic guided waves in rock bolts with different grouted ratios

AU - Yu, Jung Doung

AU - Byun, Yong Hoon

AU - Lee, Jong Sub

N1 - Funding Information: This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning ( NRF-2017R1A2B3008466 ). Publisher Copyright: © 2019 Elsevier Ltd

PY - 2019/10

Y1 - 2019/10

N2 - Nongrouted parts of rock bolts can adversely affect the stability of tunnels and rock slopes. The objective of this study is to evaluate grouted ratios of rock bolts using ultrasonic guided waves. Experimental and numerical models are composed of three-layered (steel bar, grout, and concrete) rock bolts that can provide accurate propagation characteristics of ultrasonic guided waves. Group velocities of ultrasonic guided waves are analyzed using wavelet transforms. Experimental and numerical results show that group velocities decrease with increasing grouted ratio. Results of this study demonstrate that group velocity can be used as an indicator for evaluating grouted ratios of rock bolts.

AB - Nongrouted parts of rock bolts can adversely affect the stability of tunnels and rock slopes. The objective of this study is to evaluate grouted ratios of rock bolts using ultrasonic guided waves. Experimental and numerical models are composed of three-layered (steel bar, grout, and concrete) rock bolts that can provide accurate propagation characteristics of ultrasonic guided waves. Group velocities of ultrasonic guided waves are analyzed using wavelet transforms. Experimental and numerical results show that group velocities decrease with increasing grouted ratio. Results of this study demonstrate that group velocity can be used as an indicator for evaluating grouted ratios of rock bolts.

KW - Grouted ratio

KW - Integrity

KW - Numerical analysis

KW - Rock bolt

KW - Ultrasonic guided waves

KW - Wavelet transform

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DO - 10.1016/j.compgeo.2019.103130

M3 - Article

AN - SCOPUS:85067252541

SN - 0266-352X

VL - 114

JO - Computers and Geotechnics

JF - Computers and Geotechnics

M1 - 103130

ER -

Experimental and numerical studies on group velocity of ultrasonic guided waves in rock bolts with different grouted ratios

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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