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Driven piles, installed by using hammers, are the most common offshore foundation type. However, in certain cases driven piles can incur in a premature refusal (due to plug formations, hard layers, presences of rock and boulders or soil set-up). Drilled piles are therefore used as a back-up solution. However, the technology is not always preferred as time is a key factor for offshore operations and a pile drillability analysis is generally more complex and less reliable than a drivability assessment. This paper extends the results of previous researches, which considered a theoretical drilling rate model based on the estimation of the specific excavation energy, applying a probabilistic approach. To consider the uncertainty of the geotechnical parameters of soil/rock used in drilling pile projects, a statistical method-that is, the Monte-Carlo method, has been applied to two cases of weak rock/cemented soil. It was possible to obtain the theoretical drilling rate values as a probabilistic distribution in order to assess the reliability of the estimation. It is important to understand that the drilling rates are based on a theoretical approach and they have to be considered as such. © 2017 ICE Publishing. All rights reserved.

A probabilistic approach for estimating the theoretical net drilling rate for offshore bored piles / Bosco, C.; Spagnoli, G.; Oreste, Pierpaolo. - In: GÉOTECHNIQUE LETTERS. - ISSN 2045-2543. - STAMPA. - 6:3(2016), pp. 187-191.

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