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Author: Roberto Schuerch Publisher: vdf Hochschulverlag AG ISBN: 3728138568 Category : Science Languages : en Pages : 217
Book Description
Tunnelling, Tunnel Jacking, Ground Stability, MC Model, MCC Model This thesis investigates the problem of time-dependent stability of geotechnical structures (such as trenches or tunnels) in medium- to low-permeability water-bearing grounds, typically clayey or silty soils. The peculiarity of these soils is that they respond to excavation with a delay. The time-dependency can be traced back to the swelling process triggered by the dissipation of the excavation-induced negative excess pore pressures. Unstable conditions may necessitate improvement or reinforcement of the ground or the application of a support (e.g. by compressed air or pressurized bentonite slurry in the case of tunnel face). As such measures may present economical and operational disadvantages, the question of whether and for how long the excavation can remain stable without support is of great practical relevance. The stand-up time (time lapsing between end of the excavation and the occurrence of failure), and thus the feasibility of refraining from ground reinforcement, improvement or support, depends essentially on soil strength and permeability. The goal of the thesis is to develop a computational method that allows the estimation of the stand-up time, and thus improve construction safety and economy. The main objectives towards this goal are: analysis of the mechanism of delayed failure by means of fully coupled hydraulic-mechanical continuum-mechanical simulations, investigation into the role of the constitutive behaviour of the ground (particularly that of plastic dilation), anddevelopment of a practical method of dealing with the numerical problem of mesh-sensitivity which occurs due to the localization of deformations when assuming non-associated plasticflow in any geotechnical structure at failure;planning and performing experiments and validation of the computational method and assumptions; systematic investigation of the stand-up time of the tunnel face and working-out of design charts.
Author: Roberto Schuerch Publisher: vdf Hochschulverlag AG ISBN: 3728138568 Category : Science Languages : en Pages : 217
Book Description
Tunnelling, Tunnel Jacking, Ground Stability, MC Model, MCC Model This thesis investigates the problem of time-dependent stability of geotechnical structures (such as trenches or tunnels) in medium- to low-permeability water-bearing grounds, typically clayey or silty soils. The peculiarity of these soils is that they respond to excavation with a delay. The time-dependency can be traced back to the swelling process triggered by the dissipation of the excavation-induced negative excess pore pressures. Unstable conditions may necessitate improvement or reinforcement of the ground or the application of a support (e.g. by compressed air or pressurized bentonite slurry in the case of tunnel face). As such measures may present economical and operational disadvantages, the question of whether and for how long the excavation can remain stable without support is of great practical relevance. The stand-up time (time lapsing between end of the excavation and the occurrence of failure), and thus the feasibility of refraining from ground reinforcement, improvement or support, depends essentially on soil strength and permeability. The goal of the thesis is to develop a computational method that allows the estimation of the stand-up time, and thus improve construction safety and economy. The main objectives towards this goal are: analysis of the mechanism of delayed failure by means of fully coupled hydraulic-mechanical continuum-mechanical simulations, investigation into the role of the constitutive behaviour of the ground (particularly that of plastic dilation), anddevelopment of a practical method of dealing with the numerical problem of mesh-sensitivity which occurs due to the localization of deformations when assuming non-associated plasticflow in any geotechnical structure at failure;planning and performing experiments and validation of the computational method and assumptions; systematic investigation of the stand-up time of the tunnel face and working-out of design charts.
Author: Roberto Schürch Publisher: ISBN: 9783728138576 Category : Technology & Engineering Languages : en Pages : 0
Book Description
This thesis investigates the problem of time-dependent stability of geotechnical structures (such as trenches or tunnels) in medium- to low-permeability water-bearing grounds, typically clayey or silty soils. The peculiarity of these soils is that they respond to excavation with a delay. The time-dependency can be traced back to the swelling process triggered by the dissipation of the excavation-induced negative excess pore pressures. Unstable conditions may necessitate improvement or reinforcement of the ground or the application of a support (e.g. by compressed air or pressurized bentonite slurry in the case of tunnel face). As such measures may present economical and operational disadvantages, the question of whether and for how long the excavation can remain stable without support is of great practical relevance. The stand-up time (time lapsing between end of the excavation and the occurrence of failure), and thus the feasibility of refraining from ground reinforcement, improvement or support, depends essentially on soil strength and permeability.
Author: Georgios Anagnostou Publisher: CRC Press ISBN: 1000957837 Category : Technology & Engineering Languages : en Pages : 5080
Book Description
Expanding Underground - Knowledge and Passion to Make a Positive Impact on the World contains the contributions presented at the ITA-AITES World Tunnel Congress 2023 (Athens, Greece, 12 – 18 May, 2023). Tunnels and underground space are a predominant engineering practice that can provide sustainable, cost-efficient and environmentally friendly solutions to the ever-growing needs of modern societies. This underground expansion in more diverse and challenging infrastructure types or to novel underground uses can foster the changes needed. At the same time, the tunneling and underground space community needs to be better prepared and equipped with knowledge, tools and experience, to deal with the prevailing conditions, to successfully challenge and overcome adversities on this path. The papers in this book aim at contributing to the analysis of challenging conditions, the presentation and dissemination good practices, the introduction of new concepts, new tools and innovative elements that can help engineers and all stakeholders to reach their end goals. Expanding Underground - Knowledge and Passion to Make a Positive Impact on the World covers a wide range of aspects and topics related to the whole chain of the construction and operation of underground structures: Knowledge and Passion to Expand Underground for Sustainability and Resilience Geological, Geotechnical Site Investigation and Ground Characterization Planning and Designing of Tunnels and Underground Structures Mechanised Tunnelling and Microtunnelling Conventional Tunnelling, Drill-and-Blast Applications Tunnelling in Challenging Conditions - Case Histories and Lessons Learned Innovation, Robotics and Automation BIM, Big Data and Machine Learning Applications in Tunnelling Safety, Risk and Operation of Underground Infrastructure, and Contractual Practices, Insurance and Project Management The book is a must-have reference for all professionals and stakeholders involved in tunneling and underground space development projects.
Author: The Organizing Committee of the 16th ICSMGE Publisher: IOS Press ISBN: 1614996563 Category : Technology & Engineering Languages : en Pages : 3742
Book Description
The 16th ICSMGE responds to the needs of the engineering and construction community, promoting dialog and exchange between academia and practice in various aspects of soil mechanics and geotechnical engineering. This is reflected in the central theme of the conference 'Geotechnology in Harmony with the Global Environment'. The proceedings of the conference are of great interest for geo-engineers and researchers in soil mechanics and geotechnical engineering. Volume 1 contains 5 plenary session lectures, the Terzaghi Oration, Heritage Lecture, and 3 papers presented in the major project session. Volumes 2, 3, and 4 contain papers with the following topics: Soil mechanics in general; Infrastructure and mobility; Environmental issues of geotechnical engineering; Enhancing natural disaster reduction systems; Professional practice and education. Volume 5 contains the report of practitioner/academic forum, 20 general reports, a summary of the sessions and workshops held during the conference.
Author: Richard Kastner Publisher: Thomas Telford ISBN: 9780727731241 Category : Technology & Engineering Languages : en Pages : 108
Book Description
Increasing development in the urban environment and supporting infrastructure systems has necessitated a greater use of underground space and sites that were hitherto judges to be not economically viable (e.g. because of difficult ground conditions). This presents many challenges in terms of planning, design and construction as well as the protection of existing buildings. Understanding the complex nature of soil-structure interaction and the resulting ground movements is an integral part of assessing developments involving new construction, for example tunnels and deep excavations.
Author: Meei-Ling Lin Publisher: Airiti Press ISBN: 986437141X Category : Technology & Engineering Languages : en Pages : 409
Book Description
Geotechnical Hazard Mitigations with Experiment, Theory and Practice presents the keynote lectures and general papers presented at the Fifth International ISSMGE Conference on Geotechnical Engineering for Disaster Mitigation and Rehabilitation (5th GEDMAR, Taipei, Taiwan, September 13-14, 2017). The contributions discuss rainstorm and storm surge induced riverine and coastal flooding event, liquefaction, and landslide. The book is divided into the following sections: -Keynote lecture -Combined hazard in river basin -Liquefaction -Landslide -Other natural geo-hazards Geotechnical Hazard Mitigations with Experiment, Theory and Practice will be of interest to researchers, academics, industry practitioners and other professionals involved in earthquake geotechnical engineering and landslide hazards.
Author: Cesar Ovalles Publisher: CRC Press ISBN: 1138001481 Category : Science Languages : en Pages : 2054
Book Description
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.
Author: Alexander M. Puzrin Publisher: Springer Science & Business Media ISBN: 9048135311 Category : Science Languages : en Pages : 245
Book Description
The main goal of this introductory text is to demonstrate how basic concepts in Soil Mechanics can be used as a “forensic” tool in the investigation of geotechnical failures. This, in turn, provides a good opportunity to show how to use available procedures in the formulation of useful simple models. Geotechnical failure is understood here in a broad sense as the failure of a structure to function properly due to a geotechnical reason. Some of the geotechnical failures selected are well known for their impact on the geotechnical community. Others are closer to the author’s experience. They have been organized into three main topics: Settlement, Bearing Capacity and Excavations. They cover a significant proportion of every day’s activity of professional geotechnical engineers. No attempt has been made to create a comprehensive handbook of failures. Instead, the emphasis has been given to creative applications of simple mechanical concepts and well known principles and solutions of Soil Mechanics. The book shows how much can be learned from relatively simple approaches. Despite this emphasis on simplicity, the book provides a deep insight into the cases analyzed. A non-negligible number of new analytical closed-form solutions have also been found. Their derivation can be followed in detail. In all the cases described an effort was made to provide a detailed and step by step description of the hypothesis introduced and of the analysis performed.
Author: Roberto Schuerch
Author: Roberto Schuerch
Author: Roberto Schürch
Author: Florence Mezger
Author: Tara Wanninger (-Huber)
Author: Georgios Anagnostou
Author: The Organizing Committee of the 16th ICSMGE
Author: Richard Kastner
Author: Meei-Ling Lin
Author: Cesar Ovalles
Author: Alexander M. Puzrin