Performance assessment of grouted cable bolt system under rock strata movements using multi-axis testing

Sriskanthan Srisangeerthanan, Javad Hashemi, Hossein Masoumi

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

Abstract

Cable bolt systems are extensively used to stabilize the roof of underground mining roadways from collapse due to the movement of unstable rock strata. These cable bolts are anchored at both ends and grouted. The inaccessible end of the cable bolt is typically anchored via a resin plug, whereas the exposed end comprises a steel plate with a barrel and wedge. Rock strata movements under gravity or tectonic activities can cause relative separation due to sagging and/or shear sliding of adjacent rock strata and lead to either axial loading or a combination of both axial and shear loading on the cable bolt system. Therefore, this paper presents an experimental study into the large-scale system-level performance of a cable bolt system under simulated relative rock strata movements including vertical separation and shear sliding. The tests were carried out using the Multi-Axis Substructure Testing facility at Swinburne University of Technology, Australia. High-strength reinforced concrete was selected for the confining medium to represent the strong rock strata, while the selected grout was a blended cementitious powder capable of developing high early-age strength and is among the most widely used by the mining industry. The tests were carried out within a 48-h window from grouting to study the influence of the grout medium on the overall system level performance and a non-anchored scenario has also been investigated to provide insight into the potential effects of damaged or unreliable end anchoring.

Original languageEnglish
Title of host publicationBuilding for the Future
Subtitle of host publicationDurable, Sustainable, Resilient - Proceedings of the Symposium 2023 - Volume 2
EditorsAlper Ilki, Derya Çavunt, Yavuz Selim Çavunt
PublisherSpringer
Pages1694-1703
Number of pages10
ISBN (Print)9783031325106
DOIs
Publication statusPublished - 2023
EventInternational Symposium of the International Federation for Structural Concrete 2023 - Istanbul, Türkiye
Duration: 5 Jun 20237 Jun 2023
https://link.springer.com/book/10.1007/978-3-031-32511-3 (Proceedings)

Publication series

NameLecture Notes in Civil Engineering
PublisherSpringer
Volume350
ISSN (Print)2366-2557
ISSN (Electronic)2366-2565

Conference

ConferenceInternational Symposium of the International Federation for Structural Concrete 2023
Abbreviated titlefib Symposium 2023
Country/TerritoryTürkiye
CityIstanbul
Period5/06/237/06/23
Internet address

Keywords

  • grouted cable bolts
  • large-scale system-level testing
  • Mining
  • rock strata stabilization
  • tunnelling

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