Micromechanical Analyses Of Sturzstroms Rock Avalanches On Earth And Mars
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Micromechanical Analyses Of Sturzstroms Rock Avalanches On Earth And Mars
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Author : Bernd Imre
language : en
Publisher: vdf Hochschulverlag AG
Release Date : 2012
Micromechanical Analyses Of Sturzstroms Rock Avalanches On Earth And Mars written by Bernd Imre and has been published by vdf Hochschulverlag AG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Avalanches categories.
On The Variability Of Squeezing Behaviour In Tunnelling
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Author : Florence Mezger
language : en
Publisher: vdf Hochschulverlag AG
Release Date : 2020-07-01
On The Variability Of Squeezing Behaviour In Tunnelling written by Florence Mezger and has been published by vdf Hochschulverlag AG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-07-01 with Technology & Engineering categories.
On the variability of squeezing behaviour in tunnelling
Experimental Investigations For The Modelling Of Anhydritic Swelling Claystones
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Author : Tara Wanninger (-Huber)
language : en
Publisher: vdf Hochschulverlag AG
Release Date : 2020-07-01
Experimental Investigations For The Modelling Of Anhydritic Swelling Claystones written by Tara Wanninger (-Huber) and has been published by vdf Hochschulverlag AG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-07-01 with Technology & Engineering categories.
Experimental investigations for the modelling of anhydritic swelling claystones
River Dyke Failure Modeling Under Transient Water Conditions
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Author : Wilmer Ferney Morales Peñuela
language : en
Publisher: vdf Hochschulverlag AG
Release Date : 2015-11-26
River Dyke Failure Modeling Under Transient Water Conditions written by Wilmer Ferney Morales Peñuela and has been published by vdf Hochschulverlag AG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-11-26 with Dam failures categories.
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 conditions, represented by successive flood cycles, on the seepage conditions and subsequent breaching of dykes. Therefore, three key sub-projects were carried out: • the analysis of the results from an overflow field test, • the physical modeling of small-scaled models under an enhanced gravity field, • the numerical modeling of the flow response and the resulting stability of both the air- and water-side slopes. The results from the numerical simulations matched accurately with the results obtained with the centrifuge modeling, including the prediction of local instabilities during the flood cycles for those dykes that did not include a toe filter.
On The Role Of Constitutive Behaviour In The Response Of Squeezing Ground To Tunnelling
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Author : Weijie Dong
language : en
Publisher: vdf Hochschulverlag AG
Release Date : 2017-08-14
On The Role Of Constitutive Behaviour In The Response Of Squeezing Ground To Tunnelling written by Weijie Dong and has been published by vdf Hochschulverlag AG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-08-14 with categories.
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 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.
Centrifuge Modelling Of Ground Improvement For Double Porosity Clay
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Author : Emma Jane Pooley
language : en
Publisher: vdf Hochschulverlag AG
Release Date : 2015-11-10
Centrifuge Modelling Of Ground Improvement For Double Porosity Clay written by Emma Jane Pooley and has been published by vdf Hochschulverlag AG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-11-10 with Science categories.
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 their inhomogeneity and a lack of information about the initial or current parameters. Double porosity mining waste landfills in Northern Bohemia in the Czech Republic were studied in this project. There, decades of open-cast mining of brown coal have left vast areas of land affected by the waste overburden that has been removed and dumped in old mining pits. Redevelopment of areas affected by mining sometimes requires construction on old overburden waste spoil heaps, which consist primarily of lumps of overconsolidated clay and are therefore characterised by a double porosity soil structure. The loading response on these clayfills entails large absolute and relative deformations, which means that ground improvement is normally needed before construction begins, to ensure that both stability and service limit state requirements are met. The primary aim of this research was a comparison, through physical modelling, of ground improvement techniques on double porosity clay landfills. A secondary objective was to contribute to the understanding of the material behaviour governing response to loading and other processes on double porosity soil.
Static Effects And Aspects Of Feasibility And Design Of Drainages In Tunnelling
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Author : Sara Zingg
language : en
Publisher: vdf Hochschulverlag AG
Release Date : 2017-02-21
Static Effects And Aspects Of Feasibility And Design Of Drainages In Tunnelling written by Sara Zingg and has been published by vdf Hochschulverlag AG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-02-21 with categories.
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 („consolidation“), which is favourable in terms the deformation occurring during and after tunnelling. The goal of the PhD thesis is to elaborate a more detailed understanding of the interrelationships between drainage measures and the stability of the tunnel face and grouting bodies. The main objectives of the investigations relating to the tunnel face are: 1. analysis of face stability through limit equilibrium computations taking account of the numerically determined seepage flow conditions prevailing in the ground after the implementation of drainage measures; 2. systematic investigation of tunnel face stability considering several different drainage layouts and working out designnomograms; 3. consideration of a series of aspects limiting pore pressure relief and thus the effectiveness of drainage measures and their impact on face stability. The main objectives of the investigations with regard to grouting bodies are: 1. a study of the stabilizing effect of the virtual case of ideal drainage on tunnel support and plastification in grouted fault zones in plane strain conditions; 2. a comparison with the stabilizing effect of real drainage layouts, i.e. when considering pore pressure relief due to specific drainage borehole arrangements; 3. application of the drainage measure both before and after the injection works. In summary, the contribution of this PhD thesis is the detailed investigation of the static effects of drainage measures during tunnelling in water-bearing ground with respect to the stability of the tunnel face and the grouting body as well as the supply of design aids capable of providing a quick assessment of face stability when considering a number of advance drainage schemes.
Grundbau Taschenbuch Teil 1
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Author : Karl Josef Witt
language : de
Publisher: John Wiley & Sons
Release Date : 2017-04-25
Grundbau Taschenbuch Teil 1 written by Karl Josef Witt and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-04-25 with Technology & Engineering categories.
Das Grundbau-Taschenbuch hat seit über 60 Jahren zum Ziel, Entwicklungen, neue Erfahrungen und Erkenntnisse, Berechnungs- und Nachweismethoden für die Belange der Baupraxis umfassend zusammenzutragen und transparent zu vermitteln. Auch die 8. Auflage setzt das Format konsequent fort und bringt den aktuellen Stand der Wissenschaft und der Technik auf dem Gebiet des geotechnischen Ingenieurwesens in seinen wesentlichen Sparten zusammen. Der Teil 1 "Geotechnische Grundlagen" behandelt die Grundsätze der Sicherheitsnachweise, die Erkundung des Baugrundes, die physikalischen Eigenschaften von Boden und Fels, ihre Ermittlung und Bewertung, ihre Berücksichtigung in Stoffgesetzen und in konventionellen sowie numerischen Berechnungsmethoden, die Grundlagen der Bodendynamik, Phänomene der Massenbewegungen, den Umgang mit Schadstoffen im Boden und Grundwasser und die Methoden sowie Dokumentationsmöglichkeiten der Bauwerksbeobachtung. Die meisten Beiträge wurden grundlegend überarbeitet, einige von neuen Autoren oder Koautoren. Neu hinzugekommen ist das Kapitel "Statistik und Probabilistik in der geotechnischen Bemessung".
Verhalten Eines Flussdammes Unter Wiederholter Hochwasserbelastung
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Author : Pierre André Mayor
language : de
Publisher: vdf Hochschulverlag AG
Release Date : 2014-12-18
Verhalten Eines Flussdammes Unter Wiederholter Hochwasserbelastung written by Pierre André Mayor and has been published by vdf Hochschulverlag AG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-12-18 with Science categories.
Die Hochwasserereignisse der letzten Jahrzehnte haben die Grenzen des Hochwasserschutzes deutlich ans Licht gebracht. Die Analyse der Auswirkungen von Klimaänderungen lässt zudem eine Erhöhung des Hochwasserrisikos befürchten. Viele Flussdämme als wichtiger Bestandteil des Hochwasserschutzes stammen aus dem 19. Jahrhundert und entsprechen nicht mehr dem heutigen Stand der Technik. Der Handlungsbedarf ist gross und es müssen Prioritäten entsprechend dem Gefährdungspotenzial gesetzt werden. In dieser Hinsicht sind zusätzliche Kenntnisse vom Verhalten der Flussdämme unter wiederholter Hochwasserbelastung und wechselnder Witterung notwendig. Die Reaktion eines Flussdammes auf Wasserspiegelschwankungen und Witterungseinflüsse ist ein komplexer transienter Prozess an einem nicht gesättigten Bauwerk, der nur mit Hilfe der ungesättigten Bodenmechanik rechnerisch erfasst werden kann. Im Rahmen der vorliegenden Arbeit wurde deshalb ein Feldversuch durchgeführt, einerseits um die Dammreaktion auf die Beanspruchungen durch wiederholte Hochwasserbelastung und wechselnder Witterung zu erfassen und anderseits um die ungesättigten geotechnischen Bodeneigenschaften in situ zu bestimmen.
Influence Of Smear And Compaction Zones On The Performance Of Stone Columns In Lacustrine Clay
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Author : Jean Nicolas François-Xavier Gautray
language : de
Publisher: vdf Hochschulverlag AG
Release Date : 2019-02-20
Influence Of Smear And Compaction Zones On The Performance Of Stone Columns In Lacustrine Clay written by Jean Nicolas François-Xavier Gautray and has been published by vdf Hochschulverlag AG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-02-20 with categories.