This paper presents the results of a study carried out on a 6.3-m-diameter exploratory tunnel excavated in hard rock by an open tunnel boring machine (TBM). The study provides a methodology, based on photographic analysis, for the evaluation of the particle size distribution of debris produced by the TBM. A number of tests were carried out on the debris collected during the TBM advancement. In order to produce a parameter indicative of the particle size of the debris, the coarseness index (CI) was deﬁned and compared with some parameters representative of the TBM performance [i.e. the excavation speciﬁc energy (SE) and ﬁeld penetration index (FPI)] and rock mass features, such as RMR, GSI, uniaxial compression strength and joint spacing. The results obtained showed a clear trend between the CI and some TBM performance parameters, such as SE and FPI. On the contrary, due to the rock mass fracturing, a clear relationship between the CI and rock mass characteristics was not found.
Determining the Particle Size of Debris from a Tunnel Boring Machine Through Photographic Analysis and Comparison Between Excavation Performance and Rock Mass Properties / Rispoli, A.; Ferrero, A. M.; Cardu, Marilena; Farinetti, A.. - In: ROCK MECHANICS AND ROCK ENGINEERING. - ISSN 0723-2632. - STAMPA. - 50(2017), pp. 2805-2816.
|Titolo:||Determining the Particle Size of Debris from a Tunnel Boring Machine Through Photographic Analysis and Comparison Between Excavation Performance and Rock Mass Properties|
|Data di pubblicazione:||2017|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1007/s00603-017-1256-5|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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