ABSTRACT
This part conclusion presents some closing thoughts on the key concepts discussed in the preceding chapters. The part examines the proposition that mechanical rock excavation performance should be related to basic rock parameters. The trencher excavation projects gave the opportunity to assemble data on a number of excavation projects in different rock types. The importance of the discontinuities in the rock mass on the excavation mechanism, either ripping or cutting, was clearly shown in the rates of excavation experienced. In effectively massive rock, the trencher would either cut or scrape the rock material and it was possible to relate the bit consumption, the bit wear sensu stricto and the excavation rate to rock properties. For the development of prediction models a similar approach as used with the trenchers, using expert systems, is thought useful. For each cutter suction dredger a data base and a performance model should be developed.
