Author: Florence MezgerPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
On the Variability of Squeezing Behaviour in Tunnelling
Author: Florence MezgerOn the variability of squeezing behaviour in tunnelling
Author: Florence MezgerPublisher: vdf Hochschulverlag AG
ISBN: 3728140058
Category : Technology & Engineering
Languages : en
Pages : 358
Book Description
On the variability of squeezing behaviour in tunnelling
On the Role of Constitutive Behaviour in the Response of Squeezing Ground to Tunnelling
Author: Weijie DongPublisher:
ISBN: 9783728138613
Category : Technology & Engineering
Languages : en
Pages : 0
Book Description
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 thesqueezing 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.
Spatial Effects in Tunnelling Through Squeezing Ground
Author: Linard CantieniPublisher: vdf Hochschulverlag AG
ISBN: 3728134384
Category : Technology & Engineering
Languages : en
Pages : 173
Book Description
Experimental investigations for the modelling of anhydritic swelling claystones
Author: Tara Wanninger (-Huber)Publisher: vdf Hochschulverlag AG
ISBN: 3728140112
Category : Technology & Engineering
Languages : en
Pages : 344
Book Description
Experimental investigations for the modelling of anhydritic swelling claystones
On the Feasibility of TBM Drives in Squeezing Ground and the Risk of Shield Jamming
Author: Marco RamoniPublisher: vdf Hochschulverlag AG
ISBN: 3728133639
Category : Science
Languages : en
Pages : 202
Book Description
Squeezing ground represents a challenging operating environment as it may slow down or obstruct TBM operation. Due to the geometrical constraints of the equipment, relatively small convergences of 10-20 cm may lead to considerable difficulties in the machine area (sticking of the cutter head, jamming of the shield) or in the back-up area (e.g., jamming of the back-up equipment, inadmissible convergences of the bored profile, damage to the tunnel support). Depending on the number and the length of the critical stretches, squeezing conditions may even call into question the feasibility of a TBM drive. On account of this, and bearing in mind the steady increase in the number of tunnels excavated with TBMs through so-called "difficult ground conditions", the topic investigated in this PhD thesis is of great practical relevance.Based upon case histories reported in the literature, Part I sets out firstly to give an overview of the specific problems of TBM tunnelling under squeezing conditions. Part II presents a computational model which simulates accurately and efficiently the advancing TBM and the installed tunnel support in one single computational step applying the so-called "steady state method". Part III advances a number of theory-based decision aids, which will support rapid, initial assessments to be made of thrust force requirements. Part IV investigates the complex problem of the interaction between the advancing TBM, the consolidating ground and the lining. Emphasis is thereby placed on the effect of the gross advance rate and the effect of ground permeability on shield loading during regular TBM operation (the boring process including short standstills) and during a long standstill.
The Second Half Century of Rock Mechanics, Three Volume Set
Author: Luis Ribeiro e SousaPublisher: CRC Press
ISBN: 1000006778
Category : Technology & Engineering
Languages : en
Pages : 1554
Book Description
Forty one years ago, the International Society for Rock Mechanics (ISRM) held its 1st International Congress in Lisbon, Portugal. In July 2007, the 11th ISRM Congress returned to Lisbon, where the Portuguese Geotechnical Society (SPG), the Portuguese National Group of the ISRM, hosted the meeting. The Second Half Century of Rock Mechanics comprises
Rock Engineering Risk
Author: John A. HudsonPublisher: CRC Press
ISBN: 1315738570
Category : Technology & Engineering
Languages : en
Pages : 594
Book Description
This book provides a new, necessary and valuable approach to the consideration of risk in underground engineering projects constructed within rock masses. There are Chapters on uncertainty and risk, rock engineering systems, rock fractures and rock stress, the design of a repository for radioactive waste, plus two major case examples relating to th
Handbook on Tunnels and Underground Works
Author: Emilio BilottaPublisher: CRC Press
ISBN: 1040151507
Category : Technology & Engineering
Languages : en
Pages : 659
Book Description
This book set provides a new, global, updated, thorough, clear, and practical risk-based approach to tunnelling design and construction methods, and discusses detailed examples of solutions applied to relevant case histories. It is organized in three sequential and integrated volumes: Volume 1: Concept – Basic Principles of Design Volume 2: Construction – Methods, Equipment, Tools and Materials Volume 3: Case Histories and Best Practices This book covers all aspects of tunnelling, giving useful and practical information about design (Vol. 1), construction (Vol. 2), and best practices (Vol. 3). It provides the following features and benefits: updated vision on tunnelling design, tools, materials, and construction balanced mix of theory, technology, and applied experience different and harmonized points of view from academics, professionals, and contractors easy consultation in the form of a handbook risk-oriented approach to tunnelling problems. The tunnelling industry is amazingly widespread and increasingly important all over the world, particularly in developing countries. The possible audience of this book are engineers, geologists, designers, constructors, providers, contractors, public and private customers, and, in general, technicians involved in the tunnelling and underground works industry. It is also a suitable source of information for industry professionals, senior undergraduate and graduate students, researchers, and academics.
Tunnelling
Author: Alan Muir WoodPublisher: CRC Press
ISBN: 113580950X
Category : Architecture
Languages : en
Pages : 328
Book Description
Tunnelling has become a fragmented process, excessively influenced by lawyers'notions of confrontational contractual bases. This prevents the pooling of skills, essential to the achievement of the promoters' objectives. Tunnelling: Management by Design seeks the reversal of this trend. After a brief historical treatment of selected developments, th