Erschienen: 12.08.2017 Abbildung von Dong | On the role of constitutive behaviour in the response of squeezing ground to tunnelling | 2017

Dong

On the role of constitutive behaviour in the response of squeezing ground to tunnelling

2017. Buch. 201 S. Softcover

Vdf Hochschulverlag AG. ISBN 978-3-7281-3860-6

Format (B x L): 21.2 x 29.7 cm

Gewicht: 673 g

In englischer Sprache

Produktbeschreibung

Squeezing conditions in tunnelling are characterized by the occurrence of large deformations of the opening or high rock pressure that may overstress the lining. Squeezing is associated with poor quality rock. Tunnelling in squeezing ground involves great uncertainties. It is therefore very important to gain a better understanding of the underlying mechanisms.Triaxial testing is the main source of information in order to understand the mechanical features of squeezing ground. Despite the complexity of thesqueezing mechanism and the behaviour observed under relatively simple loading conditions, most of previous research work and engineering design practice considers the ground as a linearly elastic, perfectly plastic material obeying the Mohr-Coulomb yield criterion. While the MC model is capable of predicting the final strength and post-failure volumetric behaviour of the squeezing rock, it cannot map some potentially important pre-failure features or the occasionally observed contractant plastic deformation.  In addition, the MC model usually leads to an overestimation of the strength under undrained conditions, which is unsafe for tunnel design.The present thesis mainly addresses the influence of constitutive modelling on predictions about the response of squeezing ground to tunnelling in order to provide some general guidelines for basic engineering analysis. This objective is achieved by investigating the behaviour of squeezing rocks theoretically and experimentally, using samples from several tunnel projects, including the Gotthard base tunnel and the planned Gibraltar strait tunnel.

Gesamtwerk

Die 8. Auflage ist wieder auf sechs Bände angelegt. Darin finden sich übersichtlich und in systematischer Gliederung Vertragsmuster aus der Feder erfahrener Experten. Jedem dieser Muster folgen Anmerkungen, mit denen der dem Vertragsentwurf zu Grunde liegende Sachverhalt und die Gründe für die Wahl des spezifischen Formulars erläutert werden.

Autoren

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