Affiliation:
1. Department of Environmental, Land and Infrastructural Engineering, Politecnico di Torino, Torino, Italy.
2. Department of Maritime Technologies, BAUER Maschinen GmbH, Schrobenhausen, Germany.
Abstract
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.
Subject
Earth and Planetary Sciences (miscellaneous),Geotechnical Engineering and Engineering Geology
Reference21 articles.
1. AUTOMATIC MEASUREMENT OF DRILLING PARAMETERS TO EVALUATE THE MECHANICAL PROPERTIES OF SOILS
2. De Rienzo, F. (2003). Modello geologico e geotecnico 3D del sottosuolo della città di Torino gestito mediante GIS. PhD thesis, Environmental Geoengineering, Politecnico of Torino, Italy (in Italian).
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