Bolt surface profile

The profile configuration of rockbolts is defined by the rib profile shape, and height, angle of wrap and spacing or distance between the ribs. Both bolt profile shape and profile 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 bolt than the steel rebar used in civil engineering construction, because the rock bolt is subjected to greater dynamic loading than the steel rebar.

A mining group lead by Professor Aziz (2004, 2006, 2008) at the University of Wollongong carried out a series of studies on the effect of profile spacing on loaded transfer capacity of the loaded bolt. The following test results show the influence of increased profile spacing on bolt load capacity. Two series of tests were carried out on bolts in cylindrical steel sleeves. In the first series of tests, bolts with different profile spacing were push tested in 150 mm steel sleeves, while the second set of tests were made under pull conditions using 115 mm steel sleeves.

The profile configuration of rockbolts is defined by the rib profile shape, and height, angle of wrap and spacing or distance between the ribs. Both bolt profile shape and profile 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 bolt than the steel rebar used in civil engineering construction, because the rock bolt is subjected to greater dynamic loading than the steel rebar.

surfaceprofile
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