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Expanding Underground - Knowledge and Passion to Make a Positive Impact on the World
Expanding Underground - Knowledge and Passion to Make a Positive Impact on the World contains the contributions presented at the ITA-AITES World Tunnel Congress 2023 (Athens, Greece, 12 – 18 May, 2023). Tunnels and underground space are a predominant engineering practice that can provide sustainable, cost-efficient and environmentally friendly solutions to the ever-growing needs of modern societies. This underground expansion in more diverse and challenging infrastructure types or to novel underground uses can foster the changes needed. At the same time, the tunneling and underground space community needs to be better prepared and equipped with knowledge, tools and experience, to deal with...
River dyke failure modeling under transient water conditions
Knowledge of the performance of river dykes during flooding is necessary when designing governmental assistance plans aimed to reduce both casualties and material damage. This is especially relevant when floods have increased in their frequency during the last decades, together with the resulting material damage and life costs. Most of previous attempts for analyzing dyke breaching during flooding have neglected to consider the soil mechanics component and the influence of infiltration and saturation changes on the failure mechanisms developed in the river dyke. This research project aimed to fill that gap in knowledge by analyzing, in a comprehensive manner, the effect of transient water co...
On the role of constitutive behaviour in the response of squeezing ground to tunnelling
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 the squeezing 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...
Centrifuge modelling of ground improvement for double porosity clay
Double porosity soil is characterised by a soil continuum containing two distinct porosities. Typically, this consists of macro-grains (lumps) of soil that have an internal porosity defined as the intragranular porosity. The spaces between lumps are identified as intergranular voids that give rise to the intergranular porosity. Human activities such as land reclamation or mining can give rise to large areas of land with subsoil that exhibits double porosity. The need to build in, or on, these areas is increasing, due to demand for land for industrial usage, infrastructure, and residence. However, the engineering properties of such soils are challenging, and often difficult to predict due to ...
Static effects and aspects of feasibility and design of drainages in tunnelling
This PhD thesis investigates the effectiveness of drainage measures with respect to two particularly important problems associated with tunnelling through water-bearing, weak ground: the stability of the tunnel face and the stability and deformation of grouting bodies. Water is an adverse factor with respect to the stability and deformation of underground structures due to the pore water pressure and the seepage forces associated with seepage flow towards the tunnel. Drainage boreholes reduce the pore water pressure and the seepage forces in the vicinity of the cavity. Furthermore, loss of pore water pressure increases the effective stresses and thus the shearing resistance of the ground (â€...
North American Tunneling 2010 Proceedings
"Taken from a collection of papers presented at the prestigious 2010 North American Tunneling Conference"--p. [4] of cover.
Drachenschüsselnacht
Ein überraschender Rausschmiss aus seiner Wohnung führt Kurt durch den prasselnden Regen ans Bellevue. In seiner Verzweiflung hilft ihm ein Fremder, der zufällig einen Gegenstand von Kurt auf der Strasse gefunden hat. Im bekannten Bratwurststand am Bellevue stellt sich der hilfsbereite Fremde als Gion Cantieni vor. Nach einem kurzen Gespräch lädt Cantieni Kurt spontan zu sich nach Hause ein und bietet ihm eine Schlafgelegenheit. Am nächsten Morgen steht die Polizei vor der Tür und verhaftet sowohl Cantieni, wie auch Kurt. Die beiden sind sich keiner Schuld bewusst. Der Vorwurf, die beiden (oder einer von ihnen) hätten Bruno, den Ex-Partner von Kurt umgebracht, lastet schwer. Wird sich ein Weg aus dem Gefängnis finden lassen? Dill McLain versteht es, die wirren Fäden dieser Geschichte geschickt zusammen zu führen. Ob es ein Happy End gibt? Finden Sie es heraus!
