Evaluation and Validation of the Princeton University Effective Stress Soil Model PDF Download

Author: Jean H. Prevost
Publisher:
ISBN:
Category : Shear strength of soils
Languages : en
Pages : 178

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Author: J. H. Prevost
Publisher:
ISBN:
Category :
Languages : en
Pages : 171

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An efficient finite element procedure to analyze transient phenomena in dry and/or fluid-saturated porous media is presented. The saturated porous medium is modeled as a twO-phase system consisting of a solid and a fluid phase. Time integration of the resulting semidiscrete finite element equations is performed by an implicit-explicit algorithm. In order to remove the time step size restriction associated with the presence of the stiff fluid in the mixture, the fluid contribution to the equations of motion is always treated implicitly. The procedure allows an optimal selection of the time step size independently of the fluid. Depending upon the particular intended applications (e.g., seismic, blast loading), the fluid may be assumed incompressible or compressible. Accuracy and versatility of the proposed procedure are demonstrated by applying it consolidation tests performed in centrifuges.

Author:
Publisher:
ISBN:
Category : Civil engineering
Languages : en
Pages : 178

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Author:
Publisher:
ISBN:
Category : Civil engineering
Languages : en
Pages :

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Author: Mauro Giuliano Sottile
Publisher:
ISBN:
Category :
Languages : en
Pages : 136

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Reliable modeling of rate-dependency in soil properties remains a major challenge for accurate solutions of many geotechnical problems. Although there are many sources of experimental data concerning rate dependent properties of clays, most pre-existing soil models have been found to have severe predictive limitations. Yuan (2016) developed a new elasto-viscoplastic model, MIT-SR, for rate-dependent behavior of clays. The model unifies the existing elasto-plastic framework from prior MIT soil models (3-D surface system and generalized hysteretic formulation) with a physically-based evolution law that attributes the macroscopic viscoplastic strain to an internal strain rate related to the prior strain rate history. MIT-SR has the capability of describing a wide range of observed time-effects within a unified framework and resolves the long-stranding dilemma regarding creep effects at field scale (i.e., Hypothesis A vs B). This thesis implements MIT-SR model to evaluate strain rate effects on two longstanding geotechnical problems: insitu soil characterization from pressuremeter tests and long-term performance of embankments on soft clays. The first part of this research presents a review of the constitutive model framework and discuss the implementation and validation in non-linear finite element analyses using a User Defined Material (UMAT) in the ABAQUSTM program. Part two consists of the investigation of how disturbances (modeled using Strain Path framework; Baligh, 1985) and strain rate effects (modeled by MIT-SR) affect the results of the Full Displacement or cone-pressuremeter (FDPM) and self-boring pressuremeters (SBPM) for Resedimented Boston Blue Clay (RBBC). The results show that that disturbances of the stress field play a vital role in the interpretation undrained shear strength. For the FDPM case, using the same expansion rate, the disturbed NC RBBC can have as low as 40% of the undrained shear strength of the undisturbed NC RBBC. In contrast, for the SBPM case, the disturbed NC RBBC tend to have a slightly higher undrained shear strength (approximately 10%) than the undisturbed NC RBBC. The third part consists of a re-analysis of a well-instrumented test embankment built on a 40m deep layer of Boston Blue Clay. Finite element analyses of embankment performance are conducted using coupled consolidation with the MIT-SR effective stress model. The results were compared with previous numerical results using MIT-E3 presented by Ladd et al. (1994). Overall, MIT-SR contributes a significant improvement in predictions of settlements, but does not significantly improve predictions of lateral spreading. The overall results suggest that the dependent creep properties play only a secondary role in the performance of this particular test embankment.

Author: John M. Ferritto
Publisher:
ISBN:
Category : Earthquake engineering
Languages : en
Pages : 114

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In the Prevost effective stress soil model, soil is viewed as a multi-phase medium consisting of an inelastic porous skeleton and viscous fluids. The model is a general analytical that describes the nonlinear, anisotropic, elasto-plastic, stress and strain dependent, and strength properties of the skeleton when subjected to a three-dimensional loading. This report presents a summary of the Prevost model. A summary of the model formulation is given with its implementation into the DYNAFLOW finite element code. Test data are compared with code prediction. Several boundary value problems are solved as a demonstration of capability.

Author: Bradley Gene DeRoos
Publisher:
ISBN:
Category : Marine sediments
Languages : en
Pages : 406

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Author: Francis G. McLean
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 712

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Proceedings of the conference, Boulder, CO, June 10-12, 1991. Geotechnical Special Publication No. 27.

Author: Tomasz Nowakowski
Publisher: CRC Press
ISBN: 113802709X
Category : Technology & Engineering
Languages : en
Pages : 266

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Within the last fifty years the performance requirements for technical objects and systems were supplemented with: customer expectations (quality), abilities to prevent the loss of the object properties in operation time (reliability and maintainability), protection against the effects of undesirable events (safety and security) and the ability to restore performance (resilience). The need to adapt the operation of complex systems in such an uncertain and volatile environment has caused the necessity to formulate new and well established achievements associated with modeling, testing and evaluation of these properties. The concept of a complex system applies not only to the technical ones but also the infrastructure of major importance for social life such as transportation and logistics systems, buildings, power systems, water distribution systems or health services. Safety and Reliability: Methodology and Applications contains the proceedings of the 24th European Safety and Reliability Conference (ESREL 2014, Wroclaw, Poland, 14-18 September 2014), and discusses theories and methods and their applications in the areas of risk, safety and reliability. The abstracts book (408 pages) + full paper CD-ROM (2496 pages) will be of interest to researchers and practitioners, academics and engineers working in academic, industrial and governmental sectors.

Author:
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ISBN:
Category : Research
Languages : en
Pages : 954

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Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.