Modeling Of Time Dependent And Anisotropic Behavior Of Highly Squeezing Ground PDF Download
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Author | : Yichun Liu |
Publisher | : |
Total Pages | : 0 |
Release | : 2020 |
Genre | : |
ISBN | : |
Download Modeling of Time-dependent and Anisotropic Behavior of Highly Squeezing Ground Book in PDF, ePub and Kindle
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.
Author | : Pranay Yadav |
Publisher | : |
Total Pages | : |
Release | : 2018 |
Genre | : |
ISBN | : |
Download Numerical Investigation of Anisotropic and Time-dependent Behaviours of Foliated Rock Mass Book in PDF, ePub and Kindle
Squeezing ground conditions have become a major challenge faced by underground hard rock mines exploiting reserves at greater depth and in a high-stress environment. This thesis investigates the influence of various parameters on the severity of squeezing ground conditions in foliated rock mass utilizing continuum numerical modelling in FLAC3D finite difference code. A series of numerical simulations were carried out for selected cases of two mines subject to squeezing ground conditions to investigate the rock mass failure mechanisms, the influence of various geological, mining and stress parameters, time dependence and the role of rock reinforcements. The numerical models were calibrated using field data and underground observations. The numerical models were successful in capturing the observed failure mechanisms at the two mines. The calibrated numerical models were used to investigate the influence of varying interception angle, excavation shape, excavation over-break, mining depth and parallel excavations on the severity of squeezing ground conditions utilizing ubiquitous joint model. The time dependence in the numerical models was simulated by using the power ubiquitous model and the role of various rock reinforcement elements was simulated by using structural elements. The results of the numerical simulations were found to be in good agreement with the underground convergence data and observations. The modelling methodology used in the thesis can be used to improve the understanding of the anisotropic and time-dependent behaviour of the foliated rock mass to various mining conditions. The methodology can also be used to evaluate performance of various rock reinforcement strategies and elements that are used in squeezing ground conditions.
Author | : Marco Barla |
Publisher | : Springer Nature |
Total Pages | : 1124 |
Release | : 2021-01-14 |
Genre | : Science |
ISBN | : 3030645185 |
Download Challenges and Innovations in Geomechanics Book in PDF, ePub and Kindle
This book gathers the latest advances, innovations, and applications in the field of computational geomechanics, as presented by international researchers and engineers at the 16th International Conference of the International Association for Computer Methods and Advances in Geomechanics (IACMAG 2020/21). Contributions include a wide range of topics in geomechanics such as: monitoring and remote sensing, multiphase modelling, reliability and risk analysis, surface structures, deep structures, dams and earth structures, coastal engineering, mining engineering, earthquake and dynamics, soil-atmosphere interaction, ice mechanics, landfills and waste disposal, gas and petroleum engineering, geothermal energy, offshore technology, energy geostructures, geomechanical numerical models and computational rail geotechnics.
Author | : Babu T. Jose |
Publisher | : Springer Nature |
Total Pages | : 517 |
Release | : |
Genre | : |
ISBN | : 9819733898 |
Download Proceedings of the Indian Geotechnical Conference 2022 Volume 5 Book in PDF, ePub and Kindle
Author | : N.D. Cristescu |
Publisher | : Springer Science & Business Media |
Total Pages | : 330 |
Release | : 1994-06-07 |
Genre | : Technology & Engineering |
ISBN | : 9783211825860 |
Download Visco-Plastic Behaviour of Geomaterials Book in PDF, ePub and Kindle
Aim of this book is to present to researchers and engineers a description of the present knowledge on the viscoplasticity of geomaterials, considering the experimental and theoretical aspects and the applications to relevant problems. First, the laboratory tests performed in order to quantitatively assess the theological properties of rocks are illustrated, describing the equipments used in modern rock mechanics laboratories and the proper testing procedures. Part of the presentation is devoted to the description of constitutive creep laws having different degrees of accuracy and complexity. The book covers also problems related to the application of numerical solution procedures to rock/soil mechanics situations in which the slow deformation of geomaterials is to be taken into account.
Author | : R K Goel |
Publisher | : Elsevier |
Total Pages | : 382 |
Release | : 2011-08-09 |
Genre | : Technology & Engineering |
ISBN | : 0123858798 |
Download Engineering Rock Mass Classification Book in PDF, ePub and Kindle
Rock mass classification methods are commonly used at the preliminary design stages of a construction project when there is very little information. It forms the bases for design and estimation of the required amount and type of rock support and groundwater control measures. Encompassing nearly all aspects of rock mass classifications in detail, Civil Engineering Rock Mass Classification: Tunnelling, Foundations and Landsides provides construction engineers and managers with extensive practical knowledge which is time-tested in the projects in Himalaya and other parts of the world in complex geological conditions. Rock mass classification is an essential element of feasibility studies for any near surface construction project prior to any excavation or disturbances made to earth. Written by an author team with over 50 years of experience in some of the most difficult mining regions of the world, Civil Engineering Rock Mass Classification: Tunnelling, Foundations and Landsides provides construction engineers, construction managers and mining engineers with the tools and methods to gather geotechnical data, either from rock cuts, drifts or core, and process the information for subsequent analysis. The goal is to use effective mapping techniques to obtain data can be used as input for any of the established rock classification systems. The book covers all of the commonly used classification methods including: Barton’s Q and Q’ systems, Bieniawski’s RMR, Laubscher’s MRMR and Hoek’s and GSI systems. With this book in hand, engineers will be able to gather geotechnical data, either from rock cuts, drifts or core, and process the information for subsequent analysis. Rich with international case studies and worked out equations, the focus of the book is on the practical gathering information for purposes of analysis and design. Identify the most significant parameters influencing the behaviour of a rock mass Divide a particular rock mass formulation into groups of similar behaviour, rock mass classes of varying quality Provide a basis of understanding the characteristics of each rock mass class Relate the experience of rock conditions at one site to the conditions and experience encountered at others Derive quantitative data and guidelines for engineering design Provide common basis for communication between engineers and geologists
Author | : Mosleh Ali Al-Shamrani |
Publisher | : |
Total Pages | : 650 |
Release | : 1991 |
Genre | : Soil mechanics |
ISBN | : |
Download Characterization of Time-dependent and Anisotropic Behavior of Cohesive Soils Book in PDF, ePub and Kindle
Author | : Luis Ribeiro e Sousa |
Publisher | : CRC Press |
Total Pages | : 1356 |
Release | : 2007-08-05 |
Genre | : Technology & Engineering |
ISBN | : 0415889545 |
Download The Second Half Century of Rock Mechanics, Three Volume Set Book in PDF, ePub and Kindle
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
Author | : Walter Wittke |
Publisher | : John Wiley & Sons |
Total Pages | : 865 |
Release | : 2014-04-07 |
Genre | : Technology & Engineering |
ISBN | : 3433604290 |
Download Rock Mechanics Based on an Anisotropic Jointed Rock Model (AJRM) Book in PDF, ePub and Kindle
Dieses Buch konzentriert sich auf die Grundlagen der Felsmechanik als Basis für den sicheren und wirtschaftlichen Entwurf und Bau von Tunneln, Dämmen und Böschungen in geklüftetem und anisotropem Fels. Es ist in vier Hauptteile gegliedert: Grundlagen und Modelle Berechnungs- und Entwurfsmethoden Erkundungen, Versuche, Messung und Beobachtung Anwendungen und Fallbeispiele. Die felsmechanischen Modelle berücksichtigen den Einfluss von Trennflächen auf das Spannungs-Dehnungs-Verhalten und die Durchlässigkeit von geklüftetem Fels. Dieses Buch ist für: Bau- und Bergbauingenieure Geologen Studenten aus den entsprechenden Bereichen
Author | : Vladimir Litvinenko |
Publisher | : CRC Press |
Total Pages | : 1802 |
Release | : 2018-05-15 |
Genre | : Technology & Engineering |
ISBN | : 0429868588 |
Download Geomechanics and Geodynamics of Rock Masses Book in PDF, ePub and Kindle
Geomechanics and Geodynamics of Rock Masses contains contributions presented at EUROCK 2018, the 2018 International Symposium of the International Society for Rock Mechanics (ISRM 2018, Saint Petersburg, Russia, 22-26 May 2018). Dedicated to recent advances and achievements in the fields of geomechanics and geotechnology, the main topics of the book include: - Physical and mechanical properties of fractured rock (laboratory testing and rock properties, field measurements and site investigations) - Geophysics in rock mechanics - Rock mass strength and failure - Nonlinear problems in rock mechanics - Effect of joint water on the behavior of rock foundation - Numerical modeling and back analysis - Mineral resources development: methods and rock mechanics problems - Rock mechanics and underground construction in mining, hydropower industry and civil engineering - Rock mechanics in petroleum engineering - Geodynamics and monitoring of rock mass behavior - Risks and hazards - Geomechanics of technogenic deposits Geomechanics and Geodynamics of Rock Masses will be of interest to researchers and professionals involved in the various branches of rock mechanics and rock engineering. EUROCK 2018, organized by the Saint Petersburg Mining University, is a continuation of the successful series of ISRM symposia in Europe, which began in 1992 in Chester, UK.