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Analytical study of steel bolt profile and its influence on bolt load transfer

Journal Article


Abstract


  • The load transfer capacity of fully grouted steel bolts has been the subject of research for the past three

    decades. Experimental studies have confirmed that the bolt surface profile plays an important role in

    load transfer of fully grouted rock bolting systems. This research work seeks to lay the foundation for

    the role of the bolt profile in rock bolting mechanisms. A shear failure surface which is parallel to the

    bolt surface has been assumed and investigated using stress analysis. The stress field within the resin

    introduced by the axial load of the bolt has been formulated based on the half space theory, and the

    influence of the bolt profile configuration on rock bolting failure is identified under Mohr–Coulomb’s

    failure criterion. Parametric studies show that bolts with smaller rib face angles or smaller profile

    height to length ratios are favourable to transfer load radially. Hence, they should be used in hard rock

    environments. On the contrary, bolts with large rib face angles and higher rib height to length ratios

    will transfer the major part of axial load into the resin in a direction parallel to the bolt surface. Thus,

    they should be used in soft rock conditions.

UOW Authors


Publication Date


  • 2013

Citation


  • Cao, C., Nemcik, J., Aziz, N. & Ren, T. (2013). Analytical study of steel bolt profile and its influence on bolt load transfer. International Journal of Rock Mechanics and Mining Sciences, 60 188-195.

Scopus Eid


  • 2-s2.0-84873920390

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2548

Number Of Pages


  • 7

Start Page


  • 188

End Page


  • 195

Volume


  • 60

Abstract


  • The load transfer capacity of fully grouted steel bolts has been the subject of research for the past three

    decades. Experimental studies have confirmed that the bolt surface profile plays an important role in

    load transfer of fully grouted rock bolting systems. This research work seeks to lay the foundation for

    the role of the bolt profile in rock bolting mechanisms. A shear failure surface which is parallel to the

    bolt surface has been assumed and investigated using stress analysis. The stress field within the resin

    introduced by the axial load of the bolt has been formulated based on the half space theory, and the

    influence of the bolt profile configuration on rock bolting failure is identified under Mohr–Coulomb’s

    failure criterion. Parametric studies show that bolts with smaller rib face angles or smaller profile

    height to length ratios are favourable to transfer load radially. Hence, they should be used in hard rock

    environments. On the contrary, bolts with large rib face angles and higher rib height to length ratios

    will transfer the major part of axial load into the resin in a direction parallel to the bolt surface. Thus,

    they should be used in soft rock conditions.

UOW Authors


Publication Date


  • 2013

Citation


  • Cao, C., Nemcik, J., Aziz, N. & Ren, T. (2013). Analytical study of steel bolt profile and its influence on bolt load transfer. International Journal of Rock Mechanics and Mining Sciences, 60 188-195.

Scopus Eid


  • 2-s2.0-84873920390

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2548

Number Of Pages


  • 7

Start Page


  • 188

End Page


  • 195

Volume


  • 60