Author: Sara ZinggPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Tunnel Face Stability in Narrow Water-bearing Fault Zones
Author: Sara ZinggThe Stability of Tunnels in Grouted Fault Zones
Author: Georgios AnagnostouPublisher: vdf Hochschulverlag AG
ISBN: 9783728128744
Category : Technology & Engineering
Languages : en
Pages : 172
Book Description
Static effects and aspects of feasibility and design of drainages in tunnelling
Author: Sara ZinggPublisher: vdf Hochschulverlag AG
ISBN: 3728138193
Category : Technology & Engineering
Languages : en
Pages : 228
Book Description
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.
On the Face Stability of Shallow Tunnels in Sand
Author: Ansgar KirschPublisher: Logos Verlag Berlin GmbH
ISBN: 3832521496
Category : Technology & Engineering
Languages : en
Pages : 213
Book Description
Various models have been proposed for the prediction of the necessary support pressure at the face of a shallow tunnel. To assess their quality, the collapse of a tunnel face was modelled with small scale model tests at single gravity. The evolution of the failure mechanism and the development of the support force at the face in dry sand were investigated. The observed displacement patterns show a negligible influence of overburden on the extent and evolution of the failure zone. The latter is significantly influenced, though, by the initial density of the sand: in dense sand a chimney-wedge-type collapse mechanism developed, which propagated towards the soil surface. Initially loose sand did not show any development of a discrete collapse mechanism. The necessary support force was neither influenced by the overburden nor the initial density. A comparison with quantitative predictions by several theoretical models showed that the measured necessary support pressure is overestimated by most of the models. Only those by Vermeer/Ruse and Leca/Dormieux were able to predict the necessary support pressure on a 95 % confidence level. A three-dimensional finite element investigation of face stability served to assess the ability of two constitutive models, an elastoplastic Mohr-Coulomb and a hypoplastic model, to predict the necessary support pressure and the displacements at the tunnel face. The simulation of the small scale experiments revealed that the observed necessary support pressure and incremental displacements were predicted sufficiently well with both constitutive models.
Tunnel Engineering Handbook
Author: Thomas R. KueselPublisher: Springer Science & Business Media
ISBN: 1461304490
Category : Technology & Engineering
Languages : en
Pages : 559
Book Description
The Tunnel Engineering Handbook, Second Edition provides, in a single convenient volume, comprehensive coverage of the state of the art in the design, construction, and rehabilitation of tunnels. It brings together essential information on all the principal classifications of tunnels, including soft ground, hard rock, immersed tube and cut-and-cover, with comparisons of their relative advantages and suitability. The broad coverage found in the Tunnel Engineering Handbook enables engineers to address such critical questions as how tunnels are planned and laid out, how the design of tunnels depends on site and ground conditions, and which types of tunnels and construction methods are best suited to different conditions. Written by the leading engineers in the fields, this second edition features major revisions from the first, including: * Complete updating of all chapters from the first edition * Seven completely new chapters covering tunnel stabilization and lining, difficult ground, deep shafts, water conveyance tunnels, small diameter tunnels, fire life safety, tunnel rehabilitation and tunnel construction contracting *New coverage of the modern philosophy and techniques of tunnel design and tunnel construction contracting The comprehensive coverage of the Tunnel Engineering Handbook makes it an essential resource for all practicing engineers engaged in the design of tunnels and underground construction. In addition, the book contains a wealth of information that government administrators and planners and transportation officials will use in the planning and management of tunnels.
Rock Engineering in Difficult Ground Conditions - Soft Rocks and Karst
Author: Ivan VrkljanPublisher: CRC Press
ISBN: 1482288842
Category : Science
Languages : en
Pages : 860
Book Description
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
Author: 
Author: Georgios Anagnostou![Report of Investigations. [no.2002 to No.7380] PDF](https://books.google.com/books/content/images/frontcover/nkMj2Cx9DsMC?fife=w80-h100)
Author: 
Author: