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Non-Destructive Evaluation of Rock Bolt Grouting Quality by Analysis of Its Natural Frequencies

Grouted rock bolts represent one of the most used elements for rock mass stabilization and reinforcement and the grouting quality has a crucial role in the load transfer mechanism. At the same time, the grouting quality as well as the grouting procedures are the least controlled in practice. This pa...

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Detalles Bibliográficos
Autores principales: Bačić, Mario, Kovačević, Meho Saša, Jurić Kaćunić, Danijela
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7014468/
https://www.ncbi.nlm.nih.gov/pubmed/31936340
http://dx.doi.org/10.3390/ma13020282
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author Bačić, Mario
Kovačević, Meho Saša
Jurić Kaćunić, Danijela
author_facet Bačić, Mario
Kovačević, Meho Saša
Jurić Kaćunić, Danijela
author_sort Bačić, Mario
collection PubMed
description Grouted rock bolts represent one of the most used elements for rock mass stabilization and reinforcement and the grouting quality has a crucial role in the load transfer mechanism. At the same time, the grouting quality as well as the grouting procedures are the least controlled in practice. This paper deals with the non-destructive investigation of grouting percentage through an analysis of the rock bolt’s natural frequencies after applying an artificial longitudinal impulse to its head by using a soft-steel hammer as a generator. A series of laboratory models, with different positions and percentages of the grouted section, simulating grouting defects, were tested. A comprehensive statistical analysis was conducted and a high correlation between the grouting percentage and the first three natural frequencies of rock bolt models has been established. After validation of FEM numerical models based on experimentally obtained values, a further analysis includes consideration of grout stiffness variation and its impact on natural frequencies of rock bolt.
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spelling pubmed-70144682020-03-09 Non-Destructive Evaluation of Rock Bolt Grouting Quality by Analysis of Its Natural Frequencies Bačić, Mario Kovačević, Meho Saša Jurić Kaćunić, Danijela Materials (Basel) Article Grouted rock bolts represent one of the most used elements for rock mass stabilization and reinforcement and the grouting quality has a crucial role in the load transfer mechanism. At the same time, the grouting quality as well as the grouting procedures are the least controlled in practice. This paper deals with the non-destructive investigation of grouting percentage through an analysis of the rock bolt’s natural frequencies after applying an artificial longitudinal impulse to its head by using a soft-steel hammer as a generator. A series of laboratory models, with different positions and percentages of the grouted section, simulating grouting defects, were tested. A comprehensive statistical analysis was conducted and a high correlation between the grouting percentage and the first three natural frequencies of rock bolt models has been established. After validation of FEM numerical models based on experimentally obtained values, a further analysis includes consideration of grout stiffness variation and its impact on natural frequencies of rock bolt. MDPI 2020-01-08 /pmc/articles/PMC7014468/ /pubmed/31936340 http://dx.doi.org/10.3390/ma13020282 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Bačić, Mario
Kovačević, Meho Saša
Jurić Kaćunić, Danijela
Non-Destructive Evaluation of Rock Bolt Grouting Quality by Analysis of Its Natural Frequencies
title Non-Destructive Evaluation of Rock Bolt Grouting Quality by Analysis of Its Natural Frequencies
title_full Non-Destructive Evaluation of Rock Bolt Grouting Quality by Analysis of Its Natural Frequencies
title_fullStr Non-Destructive Evaluation of Rock Bolt Grouting Quality by Analysis of Its Natural Frequencies
title_full_unstemmed Non-Destructive Evaluation of Rock Bolt Grouting Quality by Analysis of Its Natural Frequencies
title_short Non-Destructive Evaluation of Rock Bolt Grouting Quality by Analysis of Its Natural Frequencies
title_sort non-destructive evaluation of rock bolt grouting quality by analysis of its natural frequencies
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7014468/
https://www.ncbi.nlm.nih.gov/pubmed/31936340
http://dx.doi.org/10.3390/ma13020282
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