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Sulphatic claystones exhibit a heavily swelling behavior and are among the most problematic rocks for tunnelling. Their swelling is usually attributed to the transformation of anhydrite to gypsum. The paper questions this simplistic hypothesis through a qualitative ...
Reference: 59th Geomechanics Colloquy 2010 Session on “Tunnel construction in swelling ground”
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 occurrence of occasional sinkholes or very large settlements over EPB driven tunnels has been documented on a number of projects. Primary responsibility for avoiding sinkholes must lie with the tunnelling contractor, and the shield manufacturer. Almost ...
Reference: 2006 Taylor & Francis Group plc, London, UK
<p>A brief overview of jet grouting in Brazil is followed by &ldquo;why and when&rdquo; basics in relation to ground improvement for safe tunnel excavating. A number of case histories are reported - mostly NATM tunnels involving what were seen as difficult, ...
Reference: Proceedings of International Seminar on Underground Works, Lisbon, Portugal: 1–13
This paper describes the design methodology adopted for stabilization measures of a twin bored highway tunnel in Northern Greece, where severe cracking and translational displacements of the temporary support shell were observed. Cracks occurred due to an ...
Reference: Proceedings of the 30th ITA-AITES World Tunnel Congress, May 2004
The Gotthard-Base Tunnel will be the worlds longest traffic tunnel, with a length of 57 km. The tunnel is part of the New Alpine Transverse in Switzerland. The dual purpose of this project is to provide a highspeed link for passengers between Germany in the ...
Reference: The 6th annual Tunnelling Conference Sydney 30th & 31st August 2004
<p>In this paper a series of hydrogeological models are discussed depending on the internal karstic geometry of the aquifer and the position of the tunnel, either in the transfer or the inundation zone. Each model is associated with its own tunnelling particularities ...
Reference: Geotechnical & Environmental Applications of Karst Geology & Hydrology, Beck & Herring (eds) © 2001 Balkema publ
The Swiss Alptransit System (also called NEAT) is an important element of the new European high speed railway network . This system, which is currently under construction, consists of two railway axes - the Gotthard and Lštschberg Axes - which will pass through ...
Reference: GeoEng 2000, An International conference on Geotechnical & Geological Engineering, 19-24 November 2000, Melbourne, Austrelia
<p>The interaction between fully bonded rock bolts an the ground is analyzed through the homogenized material approach. The action of each radial reinforcement is smeared throughout the bolted rock annulus around the tunnel which is then treated as a fibre-reinforced ...
Reference: Rivista Italiana di Geotecnica