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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€...
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...
On the variability of squeezing behaviour in tunnelling
On the variability of squeezing behaviour in tunnelling
Tunnelling Switzerland
Die Schweiz ist das Tunnelland par excellence: Rund 1300 Tunnel und Stollen prägen das Landschaftsbild. Und laufend kommen neue hinzu. "Tunnelling Switzerland" stellt die Errungenschaften der letzten 15 Jahre auf allen Gebieten des Untertagbaus anhand von mehr als 90 Projekten vor. Dazu gehören u.a. Strassentunnel, Eisenbahntunnel, Tunnelsanierungen, Kraftwerksanlagen, Hochwasserschutzbauten und Leitungstunnel zur Energieerzeugung und Wasserversorgung. Die einzelnen Bauwerke werden jeweils auf einer Doppelseite in Wort und Bild vorgestellt. Dazu kommen Informationen zur Geologie, zu Bauherrschaft, Projektierungsbüros und Unternehmerschaft. Die englischsprachigen Beschriebe werden durch Ü...
Influence of smear and compaction zones on the performance of stone columns in lacustrine clay
Construction on soft soils is always accompanied by the risk of significant, time-dependent settlement and bearing capacity failure. As technical knowledge has advanced, optimised ground improvement has offered significant economic advantages in reducing net settlement and resisting failure by installation of more flexible and cost-effective stone columns or sand compaction piles in the ground, rather than more rigid inclusions such as steel or concrete piles. The stiffness and strength of the subsoil around the columns is greater, and the consolidation time is reduced through shorter (radial) drainage paths.
Liver Transplantation and Transplantation Oncology, An Issue of Surgical Clinics, E-Book
In this issue of Surgical Clinics, guest editor Dr. Shimul Shah brings his considerable expertise to the topic of Liver Transplantation and Transplantation Oncology. Top experts in the field review the current status of liver transplantation in North America, outcomes involving living versus deceased donors, transplants for different liver diseases, machine perfusion, and immunotherapy. - Contains 16 relevant, practice-oriented topics including outcomes of living donor liver transplantation compared to deceased donor liver transplantation; living donor liver transplantation: left lobe or right lobe; current status of liver transplantation in North America; current use of immunosuppression in...
