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Author : Georgios Anagnostou
Publisher : vdf Hochschulverlag AG
ISBN 13 : 9783728128744
Total Pages : 172 pages
Book Rating : 4.1/5 (287 download)
Download or read book The Stability of Tunnels in Grouted Fault Zones written by Georgios Anagnostou and published by vdf Hochschulverlag AG. This book was released on 2003 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sara Zingg
Publisher : vdf Hochschulverlag AG
ISBN 13 : 3728138193
Total Pages : 228 pages
Book Rating : 4.7/5 (281 download)
Download or read book Static effects and aspects of feasibility and design of drainages in tunnelling written by Sara Zingg and published by vdf Hochschulverlag AG. This book was released on 2017-02-21 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Lawrence R. Eckert
Publisher : SME
ISBN 13 : 0873353315
Total Pages : 994 pages
Book Rating : 4.8/5 (733 download)
Download or read book North American Tunneling 2010 Proceedings written by Lawrence R. Eckert and published by SME. This book was released on 2010 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Taken from a collection of papers presented at the prestigious 2010 North American Tunneling Conference"--p. [4] of cover.
Author : Florence Mezger
Publisher : vdf Hochschulverlag AG
ISBN 13 : 3728140058
Total Pages : 358 pages
Book Rating : 4.7/5 (281 download)
Download or read book On the variability of squeezing behaviour in tunnelling written by Florence Mezger and published by vdf Hochschulverlag AG. This book was released on 2020-07-01 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: On the variability of squeezing behaviour in tunnelling
Author : Weijie Dong
Publisher : vdf Hochschulverlag AG
ISBN 13 : 3728138606
Total Pages : 205 pages
Book Rating : 4.7/5 (281 download)
Download or read book On the role of constitutive behaviour in the response of squeezing ground to tunnelling written by Weijie Dong and published by vdf Hochschulverlag AG. This book was released on 2017-08-14 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Emma Jane Pooley
Publisher : vdf Hochschulverlag AG
ISBN 13 : 3728136514
Total Pages : 270 pages
Book Rating : 4.7/5 (281 download)
Download or read book Centrifuge modelling of ground improvement for double porosity clay written by Emma Jane Pooley and published by vdf Hochschulverlag AG. This book was released on 2015-11-10 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Amin Askarinejad
Publisher : vdf Hochschulverlag AG
ISBN 13 : 372813676X
Total Pages : 364 pages
Book Rating : 4.7/5 (281 download)
Download or read book Failure mechanisms in unsaturated silty sand slopes triggered by rainfall written by Amin Askarinejad and published by vdf Hochschulverlag AG. This book was released on 2015-11-26 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: Landslides triggered by rainfall cause significant damage to infrastructure annually and affect many lives in several parts of the world, including Switzerland. These landslides are initiated by a decrease in the effective stresses, and hence the shear strength of the soil, as a result of the increase in pore water pressure. The frequency of their occurrence is directly affected by the climatic and hydrological conditions in the region. Therefore, it is expected that the predicted rise in the number of extreme meteorological events, accompanied by the concentration of population and infrastructure in mountainous regions, will result in an increased number of casualties associated with landslides in the future. The main goal of this doctoral project was to study the effects of pore water pressure perturbations on the stability of unsaturated silty sand slopes and to investigate the mechanisms leading to the initiation and propagation of the shear deformations and eventually possible rapid mass movements. The behaviour of the test slope prior to the failure induced by the artificial rainfall event was investigated using analytical and numerical methods. The mechanical features of unsaturated soils and reinforcing effects of the vegetation were implemented in 2D and 3D limit equilibrium analysis. The possible depth of the failure surface was calculated based on these simplified models and was compared with the depth of the real failure surface in the landslide triggering experiment. The soil-bedrock interactions, in terms of the pattern of pore pressure distributions and their influence on stabilising or destabilising the slope, were studied and the results were compared to the field measurements.
Author : Wilmer Ferney Morales Peñuela
Publisher : vdf Hochschulverlag AG
ISBN 13 : 3728136301
Total Pages : 436 pages
Book Rating : 4.7/5 (281 download)
Download or read book River dyke failure modeling under transient water conditions written by Wilmer Ferney Morales Peñuela and published by vdf Hochschulverlag AG. This book was released on 2015-11-26 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Jian Zhao
Publisher : CRC Press
ISBN 13 : 0203840690
Total Pages : 882 pages
Book Rating : 4.2/5 (38 download)
Download or read book Rock Mechanics in Civil and Environmental Engineering written by Jian Zhao and published by CRC Press. This book was released on 2010-05-19 with total page 882 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the last two decades rock mechanics in Europe has been undergoing some major transformation. The reduction of mining activities in Europe affects heavily on rock mechanics teaching and research at universities and institutes. At the same time, new emerging activities, notably, underground infrastructure construction, geothermal energy develo
Author : Dean Brox
Publisher : CRC Press
ISBN 13 : 1351808672
Total Pages : 409 pages
Book Rating : 4.3/5 (518 download)
Download or read book Practical Guide to Rock Tunneling written by Dean Brox and published by CRC Press. This book was released on 2017-04-11 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Practical Guide to Rock Tunneling fills an important void in the literature for a practical guide to the design and construction of tunnels in rock. Practical Guide to Rock Tunneling takes the reader through all the critical steps of the design and construction for rock tunnels starting from geotechnical site investigations through to construction supervision. The guide provides suggestions and recommendations for practitioners on special topics of laboratory testing, durability of rock and acceptance for unlined water conveyance tunnels, overstressing or deep and long tunnels, risk-based evaluation of excavation methods, contract strategies, and post-construction inspections. Key considerations and lessons learned from selected case projects are presented based on the author’s extensive international experience of over 30 years and 1000 km of tunneling for civil, hydropower, and mining infrastructure, including some of the most recognized projects in the world to date. Instead of revisiting all theory and concepts that can be found in other sources, this book contains the hard learned lessons from the author’s experience in the field of Rock Tunneling, gathered over 30 years of service.
Author : Tara Wanninger (-Huber)
Publisher : vdf Hochschulverlag AG
ISBN 13 : 3728140112
Total Pages : 344 pages
Book Rating : 4.7/5 (281 download)
Download or read book Experimental investigations for the modelling of anhydritic swelling claystones written by Tara Wanninger (-Huber) and published by vdf Hochschulverlag AG. This book was released on 2020-07-01 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental investigations for the modelling of anhydritic swelling claystones
Author : Erich Saurer
Publisher : vdf Hochschulverlag AG
ISBN 13 : 3728133175
Total Pages : 192 pages
Book Rating : 4.7/5 (281 download)
Download or read book Shear Band Propagation in Soils and Dynamics of Tsunamigenic Landslides written by Erich Saurer and published by vdf Hochschulverlag AG. This book was released on 2010 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Bernd Imre
Publisher : vdf Hochschulverlag AG
ISBN 13 : 3728133310
Total Pages : 167 pages
Book Rating : 4.7/5 (281 download)
Download or read book Micromechanical Analyses of Sturzstroms (rock Avalanches) on Earth and Mars written by Bernd Imre and published by vdf Hochschulverlag AG. This book was released on 2012 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yuko Yamamoto
Publisher : vdf Hochschulverlag AG
ISBN 13 : 3728136409
Total Pages : 519 pages
Book Rating : 4.7/5 (281 download)
Download or read book Instabilities in alpine permafrost: strength and stiffness in a warming regime written by Yuko Yamamoto and published by vdf Hochschulverlag AG. This book was released on 2014-08-20 with total page 519 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alpine permafrost exists at high altitude at lower latitudes, such as in the Swiss Alps. Accelerating climate change, including rising mean annual air temperature and extreme rainfall conditions in alpine regions induces permafrost degradation. The warming of permafrost causes accelerated creep of rock glaciers, due to increased unfrozen water content and higher deformability of the ice phase. Recently, the development of deepening depressions has been observed in several rock glaciers in Switzerland, and the changes in land surface characteristics and drainage systems may initiate slope instabilities in rock glaciers. The main aim of this thesis is to characterise the strength and stiffness of alpine frozen soil in rock glaciers. To this end, the geotechnical response, such as creep and failure of frozen soil was investigated through a triaxial stress path testing programme with novel measurement systems for detecting acoustic emissions and measuring volumetric change. In addition, the resistance to crack initiation and propagation was investigated through a beam bending test programme on rectangular artificially frozen soil specimens, using the acoustic emission measurement system. The evaluation of laboratory tests on artificially frozen soil specimens implied that the development of deep depressions in rock glaciers occurs through differential creep and thermal degradation, and that the rate of deformation has the potential to lead to instabilities in rock glaciers. A comparison of the simulation results with the experimental data demonstrated that the semi-coupled model was successful in simulating the most important aspects of the temperature-dependent stress-strain relationship for the frozen soil behaviour that was measured at the element scale. This thesis contributes to an understanding of the variations in geotechnical response of alpine permafrost, by investigating the behaviour of artificially frozen soil specimens experimentally and numerically with time and temperature under specific stress paths. However, further investigations are necessary to assess the long-term stability of rock glaciers affected by climate change.
Author : Michael Iten
Publisher : vdf Hochschulverlag AG
ISBN 13 : 3728134546
Total Pages : 270 pages
Book Rating : 4.7/5 (281 download)
Download or read book Novel Applications of Distributed Fiber-optic Sensing in Geotechnical Engineering written by Michael Iten and published by vdf Hochschulverlag AG. This book was released on 2012 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Carlo Rabaiotti
Publisher : vdf Hochschulverlag AG
ISBN 13 : 3728132748
Total Pages : 243 pages
Book Rating : 4.7/5 (281 download)
Download or read book Inverse Analysis in Road Geotechnics written by Carlo Rabaiotti and published by vdf Hochschulverlag AG. This book was released on 2011 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research work had the aim of developing a procedure for back-calculating accurate and precise parameter values, describing the mechanical behaviour of the materials built in an existing road structure. After reviewing the existing testing techniques, a new device was designed and assembled at the IGT, Institute for Geotechnical Engineering (ETH Zürich) for measuring the three dimensional deflection bowl under a standard axle load (SAL). Particular attention was paid for obtaining precise and accurate significant measurements for inverse analysis. Three field tests on different locations and road structures were carried out: a flexible pavement type built in a concrete pit (indoor facility) at the EPFL (Ecole Polytechnique Federale de Lausanne), a semirigid type in Hinwil (Switzerland) and a flexible type in Bellinzona (Hinwil). The tests results show that the measured road displacements under a SAL, for relatively low temperatures, are generally reversible and time independent. Laboratory tests (uniaxial compression) were carried out on cores obtained from field samples.The strain measurements of the loaded samples were carried out with strain gages, and validated against devices with different technology (LVDT). The analysis of the test results showed that the materials have different bulk and deviatoric stress-strain behaviour. A new thermodynamical framework for non linear viscoelasticity (hyperviscoelasticity) was developed. Experimentally validated hyperviscoelastic and hyperelastic constitutive laws were adopted respectively for describing the mechanical behaviour of asphalt and cement stabilized mixtures. The inverse analysis of the field tests results was carried out with two different optimization algorithms (Levenberg Marquardt and Mesh Adaptative Direct Search), the FE program ABAQUS, and the developed user defined models. The results demonstrate the accuracy and precision of the parameter values obtained with the proposed inverse analysis procedure, demonstrating a potential for application of the developed technique for non destructing testing of real road structures.
Author : Ivan Vrkljan
Publisher : CRC Press
ISBN 13 : 1482288842
Total Pages : 860 pages
Book Rating : 4.4/5 (822 download)
Download or read book Rock Engineering in Difficult Ground Conditions - Soft Rocks and Karst written by Ivan Vrkljan and published by CRC Press. This book was released on 2009-10-14 with total page 860 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rock Engineering in Difficult Ground Conditions - Soft Rocks and Karst contains the Proceedings of the Regional Symposium of the International Society for Rock Mechanics (ISRM), which was held 29 to 31 October 2009 in Cavtat near Dubrovnik, Croatia. It is a continuation of the successful series of regional ISRM symposia for Europe, which began in 1
