On The Role Of Constitutive Behaviour In The Response Of Squeezing Ground To Tunnelling PDF Download

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On the role of constitutive behaviour in the response of squeezing ground to tunnelling

On the role of constitutive behaviour in the response of squeezing ground to tunnelling
Author: Weijie Dong
Publisher: vdf Hochschulverlag AG
Total Pages: 205
Release: 2017-08-14
Genre: Technology & Engineering
ISBN: 3728138606
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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.

On the variability of squeezing behaviour in tunnelling

On the variability of squeezing behaviour in tunnelling
Author: Florence Mezger
Publisher: vdf Hochschulverlag AG
Total Pages: 358
Release: 2020-07-01
Genre: Technology & Engineering
ISBN: 3728140058
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On the variability of squeezing behaviour in tunnelling

Experimental investigations for the modelling of anhydritic swelling claystones

Experimental investigations for the modelling of anhydritic swelling claystones
Author: Tara Wanninger (-Huber)
Publisher: vdf Hochschulverlag AG
Total Pages: 344
Release: 2020-07-01
Genre: Technology & Engineering
ISBN: 3728140112
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Experimental investigations for the modelling of anhydritic swelling claystones

Analytical Methods in Petroleum Upstream Applications

Analytical Methods in Petroleum Upstream Applications
Author: Cesar Ovalles
Publisher: CRC Press
Total Pages: 2054
Release: 2015-04-02
Genre: Science
ISBN: 1138001481
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Effective measurement of the composition and properties of petroleum is essential for its exploration, production, and refining; however, new technologies and methodologies are not adequately documented in much of the current literature. Analytical Methods in Petroleum Upstream Applications explores advances in the analytical methods and instrumentation that allow more accurate determination of the components, classes of compounds, properties, and features of petroleum and its fractions. Recognized experts explore a host of topics, including: A petroleum molecular composition continuity model as a context for other analytical measurements A modern modular sampling system for use in the lab or the process area to collect and control samples for subsequent analysis The importance of oil-in-water measurements and monitoring The chemical and physical properties of heavy oils, their fractions, and products from their upgrading Analytical measurements using gas chromatography and nuclear magnetic resonance (NMR) applications Asphaltene and heavy ends analysis Chemometrics and modeling approaches for understanding petroleum composition and properties to improve upstream, midstream, and downstream operations Due to the renaissance of gas and oil production in North America, interest has grown in analytical methods for a wide range of applications. The understanding provided in this text is designed to help chemists, geologists, and chemical and petroleum engineers make more accurate estimates of the crude value to specific refinery configurations, providing insight into optimum development and extraction schemes.

Modeling of Time-dependent and Anisotropic Behavior of Highly Squeezing Ground

Modeling of Time-dependent and Anisotropic Behavior of Highly Squeezing Ground
Author: Yichun Liu
Publisher:
Total Pages: 0
Release: 2020
Genre:
ISBN:
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Operational difficulties are frequently encountered during the excavation of tunnels in squeezing ground because of large, time-dependent and often anisotropic deformation. In the context of the future Lyon-Turin link, an access gallery (SMP2) and a survey gallery (SMP4) are excavated by conventional method in Saint-Martin-la-Porte (SMP) in France. A strongly tectonized Carboniferous formation was crossed which is highly fractured and heterogeneous. Squeezing behavior was observed and led to instability of support system and tunnel face. Specific excavation and support methods were adopted with an extensive field monitoring program. During the past years, several studies have been carried out to analyze the squeezing rock behavior and the interaction between the ground and the support system in SMP2: a processing procedure of anisotropic convergence data has been proposed and an anisotropic visco-elastic-plastic constitutive model has been developed and implemented in Flac3D code.On the basis of the gained knowledge and the new available field data, developed tools for data processing and numerical simulation of SMP2 are extrapolated for longer-time scale and applied to the conditions encountered in SMP4, which is much deeper and excavated in another direction. By extending the proposed method and applying the obtained values of parameters, field data are studied for the anisotropic closure of different parts of SMP4 taking into account the stages of excavation and support installation to predict long-term convergence of the galleries. The developed anisotropic visco-elastic-plastic constitutive model in the previous studies is improved to simulate the mid-term and long-term behavior of SMP2 considering the excavation stages, the specific yielding support and the reprofiling process. Different excavation profiles of SMP4 are modeled. The constitutive parameters are identified and the ground and tunnel response is well reproduced.

Handbook on Tunnels and Underground Works

Handbook on Tunnels and Underground Works
Author: Emilio Bilotta
Publisher: CRC Press
Total Pages: 414
Release: 2022-02-23
Genre: Technology & Engineering
ISBN: 1000538656
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The book 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 The book covers all aspects of tunnelling, giving useful and practical information about design (Volume 1), construction (Volume 2) and best practices (Volume 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 the 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.