This paper discusses the result of 181 pull tests of rock bolts and cable bolts in the sandstones and shales of the Sydney region. The pull tests were carried out as part of the Sydney Metro Northwest tunnelling project. The tested bolts include: end-anchored corrosion-protected steel bolts, resin-grouted fibre reinforced plastic bolts, cement-grouted multi-strand cable bolts and friction bolts. Recorded and corrected bolt stiffness characteristics are presented by bolt type, grouting agent, lithology, bolt bar material and borehole diameter. Rock-grout and grout-bar interface bond strengths are assessed for different rock mass units and bolt parameters. Common problems with typical pull test arrangements and their impact on the resulting data are discussed. Examples of issues encountered during bolt installation, such as partial grout encapsulation and insufficient mixing of resin, are presented. Recommendations are made on how some of these problems can be detected and prevented.
Tunnelling and Underground Space Technology – Elsevier
Published: Apr 1, 2018
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera