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  Effect of cutterhead on performance of EPBM in mixed face condition

  The type of cutting tools installed on the cutterhead, the position and ratio of openings have a significant effect on the performance and efficiency of EPBM machines. A 5.4 km length of the first line of Isfahan metro project was excavated using two EPBMs over a four-year period. After completion of the tunnels, an assessment was carried out of the performance of the machine when excavating in cemented soil and rock as well as other mixed faces. This analysis concluded that it was necessary to replace the cutterhead before excavation of Line 2. This paper will present a comparison between the performances of the specific cutterhead configuration on the TBM on Line 1 with a revised cutterhead configuration for the excavation of about 3 km of Line 2 to choose the best one for excavation of the last 3 km of Line 2.

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