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Bolt profile configuration and load transfer capacity optimisation

Conference Paper


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Abstract


  • Both bolt profile shape and spacing (rib spacing) have been

    found to influence the bonding capacity of the grouted rock bolt.

    The bolt surface profile configuration has greater importance to rock

    bolting in strata reinforcement in mining than the steel rebar used in

    civil engineering construction. This is because a rock bolt in mining

    usually is subjected to greater dynamic loading than the steel rebar

    in civil engineering construction. The increased bonding capacity

    of a bolt is important when supported ground is either heavily

    fractured, faulted or the supported ground is of soft formation,

    typically that of coal measure rocks. Past laboratory studies have

    identified the bolt profile spacing as of significant relevance to bolt

    resin rock bonding increase, however, no attempt has been made to

    determine the optimum spacing between the bolt profiles spacing.

    Accordingly, a series of laboratory tests were carried out on 22 mm

    core diameter bolts, commonly used in Australian mines, installed

    in cylindrical steel sleeve. The study was carried out using both

    push and pull testing methods. The push test was carried out in 150

    mm long sleeves while the pull testing was conducted in 115 mm

    long sleeves. Profile spacing tested include, 12.5, 25.0, 37.5, and

    50 mm lengths. Additional studies undertaken include modelling

    the profile of the load-displacement data of pull testing. Bolts with

    a profile spacing of 37.5 mm were found to provide optimum load

    bearing capacity as compared to other tested profile spacings.

UOW Authors


  •   Jalalifar, Hossein (external author)
  •   Aziz, Naj I.
  •   Cao, Chen (external author)
  •   Nemcik, Jan A.

Publication Date


  • 2009

Citation


  • Aziz, N., Nemcik, J., Cao, C. & Jalalifar, H. (2009). Bolt profile configuration and load transfer capacity optimisation. 28th International Conference on Ground Control in Mining (pp. 48-52). United States:

Scopus Eid


  • 2-s2.0-79551539327

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3456&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2447

Has Global Citation Frequency


Abstract


  • Both bolt profile shape and spacing (rib spacing) have been

    found to influence the bonding capacity of the grouted rock bolt.

    The bolt surface profile configuration has greater importance to rock

    bolting in strata reinforcement in mining than the steel rebar used in

    civil engineering construction. This is because a rock bolt in mining

    usually is subjected to greater dynamic loading than the steel rebar

    in civil engineering construction. The increased bonding capacity

    of a bolt is important when supported ground is either heavily

    fractured, faulted or the supported ground is of soft formation,

    typically that of coal measure rocks. Past laboratory studies have

    identified the bolt profile spacing as of significant relevance to bolt

    resin rock bonding increase, however, no attempt has been made to

    determine the optimum spacing between the bolt profiles spacing.

    Accordingly, a series of laboratory tests were carried out on 22 mm

    core diameter bolts, commonly used in Australian mines, installed

    in cylindrical steel sleeve. The study was carried out using both

    push and pull testing methods. The push test was carried out in 150

    mm long sleeves while the pull testing was conducted in 115 mm

    long sleeves. Profile spacing tested include, 12.5, 25.0, 37.5, and

    50 mm lengths. Additional studies undertaken include modelling

    the profile of the load-displacement data of pull testing. Bolts with

    a profile spacing of 37.5 mm were found to provide optimum load

    bearing capacity as compared to other tested profile spacings.

UOW Authors


  •   Jalalifar, Hossein (external author)
  •   Aziz, Naj I.
  •   Cao, Chen (external author)
  •   Nemcik, Jan A.

Publication Date


  • 2009

Citation


  • Aziz, N., Nemcik, J., Cao, C. & Jalalifar, H. (2009). Bolt profile configuration and load transfer capacity optimisation. 28th International Conference on Ground Control in Mining (pp. 48-52). United States:

Scopus Eid


  • 2-s2.0-79551539327

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3456&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2447

Has Global Citation Frequency