Table 4.

General approaches to treatment of deteriorating rockslopes.

RDAAClassAdjustedratingDeteriorationsusceptibilityApproaches to remedial treatment1
1<21Very lowReactive approach: maintain or remedy as necessary. For example, infrequent inspection and debris clearance
221–40LowPassive approach: control the effects of deterioration by containment and protection. Examples include scaling; wire netting; rock catch ditch and protective fencing
341–60ModerateActive approach: reinforce the slope and slope materials to resist processes of deterioration. For example, surface protection (e.g. shotcrete, geotextiles and vegetation); dowels, cables, anchors and rockbolts; dentition
461–80HighIntrusive approach: retain and support the slope. For example, crib walls, gabions and buttresses; underpinning
5>80Very highSlope redesign: examples include reducing slope gradient; benching; increasing stand-off; rockfall shelters
  • 1Approaches to remedial treatment are cumulative, i.e. a class 3 slope will require an ‘active’ approach in addition to measures indicated for classes 1 and 2.