New Models for Strength and Deformability Parameter Calculation in Rock Masses Using Data-Mining Techniques
Publication: International Journal of Geomechanics
Volume 11, Issue 1
Abstract
Due to the inherent geological complexity and characterization difficulties in rock formations, the evaluation of geomechanical parameters is very complex, mostly in the initial project stages and in small-scale geotechnical works, where information is scarce for the definition of an accurate geotechnical model. However, in large geotechnical projects, a great amount of data are produced and used to establish near-homogeneous geotechnical zones. If properly analyzed, these data can provide valuable information that can be used in situations where knowledge of the rock mass is limited. Yet, this implies the organization of geotechnical data in formats for proper analysis using advanced tools which is not normally done. Data-mining techniques have been successfully used in many fields but scarcely in geotechnics. They seem to be adequate as an advanced technique for analyzing large and complex databases that can be built with geotechnical information within the framework of an overall process of knowledge discovery in databases (KDD). In this work, a first approach of a KDD process applied in the context of rock mechanics is presented. The main goal was to find new models to evaluate strength and deformability parameters. In this process, a large database of geotechnical data was assembled concerning an important underground structure built in a predominantly granite rock formation. These innovative methodologies and tools were used to analyze and extract new and useful knowledge. The procedure allowed developing new, simple, and reliable models to predict geomechanical parameters, namely friction angle, cohesion, and deformability modulus using different sets of input data that can be used in different situations of information availability.
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Acknowledgments
The writers wish to express their thanks to EDP Produção EM for authorization and making available the necessary data. This work was financed by the Foundation for Science and Technology (FCT) in the framework of the Research Project No. UNSPECIFIEDPOCI/ECM/57495/2004, entitled Geotechnical Risk in Tunnels for High Speed Trains.
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 11 • Issue 1 • February 2011
Pages: 44 - 58
Copyright
© 2011 ASCE.
History
Received: Feb 4, 2009
Accepted: Jun 8, 2010
Published online: Jun 24, 2010
Published in print: Feb 2011
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