The excavation disk cutter is used for the tunnel boring machines because of the noise abatement and/or the safety. However, the hydraulic control of the force for the bedrock is not driven by the automatic control because the advantage is not clear. So, this paper considers the efficiency of the automatic control which drives the excavation disk cutter. Experiments are carried out by using a model excavator with excavation disk cutter for tunnel boring machines. The experimental results are assessed by MV-index and compared with the estimated output of minimum variance control. The application merit of the automatic control is evaluated by this procedure.
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