Load transfer characteristics of plain and spiral cable bolts tested in new non rotating pull testing apparatus

Aziz, Naj and Mirza, Ali and Nemcik, Jan and Li, Xuwei and Rasekh, Haleh and Wang, Gaofeng (2016) Load transfer characteristics of plain and spiral cable bolts tested in new non rotating pull testing apparatus. In: 2016 Coal Operators' Conference, 10-12 Feb 2016, Wollongong, Australia.

Abstract

The load transfer mechanisms of cable bolts differ from normal rebar bolts. Cable bolts used in mines are basically steel strands with different constructions depending on the number of wires or elements and the way that these elements are laid. Tendon bolts (rebar and cable) are normally
evaluated for strength and load transfer properties. The strength of tendon can be carried out by tensile
failure tests, while the load transfer strength is evaluated by pull and shear strength tests. Short
Encapsulation Pull Testing (SEPT) is used to study of the load transfer capacities of tendons, and can
be undertaken both in the laboratory and in situ. A new apparatus known as Minova Axially Split
Embedment Apparatus (MASEA) was used to study load-displacement characteristics of smooth versus
spiral profile cable bolts. Minova Stratabinder grout was used for encapsulating 400 mm long 19 wire 22
mm diameter superstrand cable in the embedment units. The anchorage of the cable on two sides of the
embedment apparatus were intentionally installed at different lengths, to allow the cable to be pulled out
from one side of the anchorage. The spiral wire strand cable bolts achieved higher peak pull-out load at
minimum displacement in comparison with smooth surface wire strand. The peak pull out force increased with the age of encapsulation grout. The MASEA was easier to assemble and test at a short period of time, thus allowing quick and repeated tests to be undertaken.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: No paper in these proceedings is to be re-published unless with written permission from the conference organisers and/or the original authors who maintain the copyright for their work.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 20 Mar 2017 23:52
Last Modified: 10 Jul 2017 03:15
Uncontrolled Keywords: cable bolts; load transfer mechanisms
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering
URI: http://eprints.usq.edu.au/id/eprint/30789

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