Improved Ground Control Using Hydro Scaling and In-CycleShotcrete

摘要

The use of hydro scaling and in-cycle shotcrete to replace conventionalrnjumbo scaling,mesh and bolting as the primary method of ground controlrnfor run of mine development has been investigated through extensiverntrials at the Waroonga mine,Agnew Gold Mining Company.These trialsrnhave progressed from investigating the productivity aspects of the methodrnthrough to a three month mine-wide trial,which may yet lead to thernadoption of this potentially best practice ground control technique atrnAgnew.Overseas trials and research have shown that hydro scalingrnresults in a significant improvement in the shotcrete-rock bond strength.rnGood adhesive bond strength ensures that the shear strength of thernshotcrete layer rather than it 's flexural or tensile strength is fullyrnmobilised as rock mass reinforcement.This maximises shotcretes groundrnreinforcement capability and it is suggested that a bolt-less fibrecreternsupport design is feasible using the hydro scaling technique.