Improving performances of friction rock bolts by using new spring plates

Abstract

In this study, a new spring plate was designed and investigated for its usability with the split set type friction bolts. According to the results of this study, remarkable active support pressures can be practically supplied by compression of the new spring plate during the insertion of the split sets. In addition to easy supply of the active support pressure owing to the insertion of the bolts, the energy absorption capacity can be highly improved by use of the new spring plate. Furthermore, the new plate design is remarkably advantageous against the nonaxial loading condition which is very wide in the bolted rock masses.

Investigation of New Energy Absorbing Mechanisms Used to Fix Rock Bolt Plates

“…D-bolts are also advantageous in terms of supplying a notably improved energy absorption capacity by bolting in the burst prone rock masses [13,14]. Besides of the bolt types dealt above, different rock bolts were also designed in the last two decades and various studies were carried out for the aim of improving rock bolts against the rock burst induced impact loads [15][16][17][18]. As the increase of mining depths make more miners to experience the rock burst problem, energy absorbing rock bolts seem to be used more widely in near future than being in todays.…”