The effects of complex geology on the excavation efficiencies of different type of TBM's used in the ten projects mentioned above are explained in this paper and some recommendations with a ground classification system for proper use of TBMs in faultyzones are given.
The efficiency of excavation a mining tunnel is definitely linked with modes of cut-holes.
Determination of the stability states of the roadheader is an important matter for the efficiency of excavation.
Determination of the stability states of roadheaders is also important matter for the efficiency of the excavation.
This operating mode allows reduction of discontinuities of excavation in order to obtain greater efficiency by reducing the excavation time.
In rock cutting mechanics, the effects of the rock and brittleness on the efficiency of drilling and excavation are examined by many researchers.
Applications of ODIA to a slope and surrounding rock of an excavation were presented to further confirm the accuracy, efficiency, and practicability of the approach.
These objectives are driven by economic considerations as the cost is, firstly, directly proportional to the number of holes drilled and secondly, related to the efficiency of target material recovery associated with excavation and blast damage.
Actual times to perform three operations, drill and blast, muck removal and concrete lining emplacement were much larger than expected and represent the largest portion of the total excavation cycle time and had the largest impact on the efficiency of the excavation cycles and schedules.
