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Experimental and analytical studies of the parameters influencing the action of TBM disc tools in tunnelling

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Abstract

The use of tunnel boring machines (TBMs) is increasingly popular in tunnelling. One of the most important aspects in the use of these machines is to assess with certain accuracy the effectiveness of the action of the discs on the cutter-head in the different rock types to be excavated. A specific machine, called an intermediate linear cutting machine (ILCM), has been developed at the Politecnico di Torino in order to study, on a reduced scale in detail in the laboratory, the interaction between the discs of the TBM and the rock: this machine allows a series of grooves to be cut on a rock sample of 0.5 × 0.3 × 0.2 m, through the rolling of a 6.5-in. disc, and evaluation, during testing, of the parameters associated with the action of the cutting tool. The parameters measured during the tests were compared with the results obtained employing two analytical methods widely used for predicting the performance of TBMs: the Colorado School of Mines (CSM) model and the Norwegian University of Science and Technology (NTNU) model. The latter showed a greater ability to reproduce tests conducted using the ILCM. However, as with the CSM model, it does not allow the optimal excavation condition (the ratio, which minimizes the specific energy of excavation, between the groove spacing and the penetration of the disc), necessary for the correct design of the TBM cutter-head, to be identified. An example, based on a real case of a tunnel in Northern Italy, allowed a demonstration of how the NTNU model provides results in line with the measurements taken during the excavation and represents, therefore, a model that is able to reliably simulate both laboratory tests and the action of a TBM on site. The NTNU model, together with the results of the tests with ILCM targeted on the identification of the optimal conditions of excavation, may allow the correct dimensioning of the TBM cutter-head to be attained in order to effectively implement the excavation.

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Authors and Affiliations

  1. Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129, Turin, Italy

    Marilena Cardu & Pierpaolo Oreste

  2. IGAG CNR, Corso Duca degli Abruzzi, 24, 10129, Turin, Italy

    Marilena Cardu, Giorgio Iabichino & Pierpaolo Oreste

  3. Department of Earth Sciences, University of Turin, Via Tommaso Valperga Caluso, 35, 10125, Turin, Italy

    Andrea Rispoli

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  1. Marilena Cardu
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  2. Giorgio Iabichino
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  3. Pierpaolo Oreste
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  4. Andrea Rispoli
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Correspondence to Pierpaolo Oreste.

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Cardu, M., Iabichino, G., Oreste, P. et al. Experimental and analytical studies of the parameters influencing the action of TBM disc tools in tunnelling. Acta Geotech. 12, 293–304 (2017). https://doi.org/10.1007/s11440-016-0453-9

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  • DOI: https://doi.org/10.1007/s11440-016-0453-9

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