Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Tunnel support for stress induced failures in Hawkesbury Sandstone
AbstractUnderlying much of Sydney, Australia is a composite rock formation known as the Hawkesbury Sandstone. This unit is composed of clastic layers of variable competency including a number of thick and strong layers. The presence of very high horizontal stresses within these layers is widely accepted. Deep excavations such as basements or open cuts in Hawkesbury Sandstone often experience moderate horizontal movements in excess of 1mm per metre of rock excavation. These movements can result in various scales of damage and excess loads on supporting elements. Stress induced failures in tunnels and underground excavations have also been observed in a number of projects and include crushing, spalling and or slabbing of intact rock blocks or shear failures associated with planes of weakness. While most design approaches in ground engineering account for shear failure mechanisms, the assessment of brittle failure is less common and less well understood. Conventional models and failure criteria do not appropriately describe such behaviour and consequently the impacts on ground support may not always be appropriately addressed. This paper presents some discussions on the modelling and assessment of brittle failure in Hawkesbury Sandstone and some of the impacts of high in-situ stresses on tunnel support design.
Tunnel support for stress induced failures in Hawkesbury Sandstone
AbstractUnderlying much of Sydney, Australia is a composite rock formation known as the Hawkesbury Sandstone. This unit is composed of clastic layers of variable competency including a number of thick and strong layers. The presence of very high horizontal stresses within these layers is widely accepted. Deep excavations such as basements or open cuts in Hawkesbury Sandstone often experience moderate horizontal movements in excess of 1mm per metre of rock excavation. These movements can result in various scales of damage and excess loads on supporting elements. Stress induced failures in tunnels and underground excavations have also been observed in a number of projects and include crushing, spalling and or slabbing of intact rock blocks or shear failures associated with planes of weakness. While most design approaches in ground engineering account for shear failure mechanisms, the assessment of brittle failure is less common and less well understood. Conventional models and failure criteria do not appropriately describe such behaviour and consequently the impacts on ground support may not always be appropriately addressed. This paper presents some discussions on the modelling and assessment of brittle failure in Hawkesbury Sandstone and some of the impacts of high in-situ stresses on tunnel support design.
Tunnel support for stress induced failures in Hawkesbury Sandstone
Oliveira, David (Autor:in) / Diederichs, Mark S. (Autor:in)
Tunnelling and Underground Space Technology ; 64 ; 10-23
09.01.2017
14 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Tunnel support for stress induced failures in Hawkesbury Sandstone
Elsevier | 2017
|Tunnel support for stress induced failures in Hawkesbury Sandstone
Online Contents | 2017
|Tunnel support for stress induced failures in Hawkesbury Sandstone
British Library Online Contents | 2017
|Tunnel support for stress induced failures in Hawkesbury Sandstone
British Library Online Contents | 2017
|Impact of fire on tunnels in Hawkesbury sandstone
Elsevier | 2006
|