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Publications by [Hoek E.]

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Overstressing of the rock surrounding a tunnel can result in either brittle fracture of the intact rock or shear failure along pre-existing discontinuities such as joints or shear zones. These two types of failure can co-exist and the extent to which the failures ...
Reference: Rock Engineering in Difficult Ground Conditions – Soft Rocks and Karst – Vrkljan (ed) © 2010 Taylor & Francis Group, London
<p>The 5 m diameter 23.3 km long Yacamb&uacute;-Quibor tunnel is designed to carry water through the Andes from the Yacamb&uacute; dam in the wet tropical Orinoco basin to the semi-arid but fertile Quibor basin in western Venezuela. The tunnel is excavated ...
Reference: Rock Mechanics and Rock Engineering, Vol. 42, No. 2, 389 - 418
<p>The notes are intended to provide an insight into practical rock engineering to students, geotechnical engineers and engineering geologists.</p>
Reference: Hoek's corner
Case studies of difficult rock masses for slope excavations at Egnatia Odos Highway.
Reference: XI Conference on Rock Mechanics, Turin, November 2006
A discussion on the use of the geological strength index (GSI) for the characterisation of tectonically undisturbed but lithologically varied sedimentary rocks rock masses is presented. Two GSI charts are proposed for estimating the mechanical properties ...
Reference: International Journal of Rock Mechanics & Mining Sciences 42 (2005) 277-285
The highly variable nature of deeply weathered Oporto granite posed significant challenges in the driving of the 2.3km long Cline and the 4km long S line of the Oporto Metro project. Two 8.7m diameter Herrenknecht EPB TBMs were used to excavate these tunnels ...
Reference: Conference in Aveiro, Portugal, (2004)
<p>The Thissavros hydropower and pumped storage project on the Nestos river in northern Greece involved construction of a 172 m high rockfill dam and an underground power house with 300 MW installed capacity. Bedrock at the site consists of gneiss with complex ...
Reference: Proceedings: Fifth International Conference on Case Histories in Geotechnical Engineering, New York, NY, April 13-17, 2004
<p>Tunnels of 10 to 16 m span are frequently constructed for hydroelectric or transportation projects, and many of these tunnels are excavated in rock masses of very poor quality. When the ratio of rock mass strength to in situ stress falls below 0.2, squeezing ...
Reference: JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING / SEPTEMBER 2001
This paper presents a methodology for estimating the properties of heterogenous rock masses such as flysch.
Reference: Bull. Engg. Geol. Env. 60, 85-92, 2001
In tunnelling through heterogeneous rock masses, such as the flysch, it is important to attempt to obtain reliable estimates of potential tunnelling problems as early as possible. This enables the tunnel designer to focus on the selection of optimum routes ...
Reference: Tunnels and Tunnelling International Part 1 – November 2000, Part 2 – December 2000.