Download or read book Effect of Imperfect Direct Simple Shear Test Boundary Conditions on Monotonic and Cyclic Measurements written by Man Ho Daniel Wai and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The direct simple shear (DSS) test is commonly used to assess shear strength of soil, estimate liquefaction resistance, or calibrate constitutive models. However, constitutive models are calibrated assuming ideal simple shear stress conditions even though this is not achieved in the DSS test. Near frictionless vertical boundaries cannot develop the complementary shear stresses necessary for ideal simple shear conditions. Difficulties in maintaining constant height during undrained tests violates the constant volume assumption. The top cap holding the top of the specimen can rock (rotate) during shear also violating the assumed perfect simple shear conditions. Parametric studies were conducted to investigate the effect of contact friction between the soil and vertical boundaries, vertical compliance and top cap rocking on the results of undrained DSS tests. The study simulates an industry-standard SGI type simple shear device using a 3-D finite element model and an advanced plasticity model to capture soil behaviour.
Download or read book Effect of Different Modes of Lateral Boundary Constraints of the Direct Simple Shear DSS Device Under Monotonic and Cyclic Shear Loading written by Priyesh Verma and published by . This book was released on 2020 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Volume Change in Undrained Direct Simple Shear Tests written by Helene Alexandra Amundsen and published by . This book was released on 2019 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to perform constant-volume (equivalent to undrained) Direct Simple Shear (DSS) tests using either a wire-reinforced membrane or stacked rings as the zero lateral strain confinement system, the height (and thereby volume) of the test specimen must be maintained at a constant during shear. The change in vertical stress while maintaining constant specimen height during shear is equivalent to the excess pore pressure that would have developed in a truly undrained DSS test. Depending on the control capabilities of active height-control DSS devices and the stiffness of locked (passive) height-control DSS devices, the specimen height may not be perfectly constant throughout shear in some cases. This technical note presents the results of monotonic constant-volume DSS tests where the specimen height was intentionally varied during shear to demonstrate the effect on measured shear stress and vertical effective stress. Changing the test specimen height by 0.05 % (the maximum specified by ASTM D6528, Standard Test Method for Consolidated Undrained Direct Simple Shear Testing of Fine Grain Soils) affected the test results. The percentage deviations in the measured test results are greater for stiffer soil specimens, about 2 % for soft normally consolidated clay and more than 20 % for dense sand at failure.
Download or read book Sample Size Effects Using the NGI Direct Simple Shear Apparatus written by Michael D. Carroll and published by . This book was released on 1979 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The contents of this report include a comparison of direct simple shear test results for variations in sample size and for two different soils. Soils tested were undisturbed samples of Gulf of Alaska and Gulf of Mexico clays. Testing was performed on the Norwegian Geotechnical Institute Direct Simple Shear Device and included both static and cyclic loading applications. The emphasis was on cyclic loading results. The parameters varied were sample cross section and sample height. Two cross-sectional sizes and three heights are compared. Test data included lateral strain measurements from which horizontal normal stresses and subsequently K sub o values were calculated. The calculations and results are discussed as affected by the sample size, with special attention to K sub o values. The main conclusions from this investigation were: K sub o is affected by changes in height; the smaller cross-sectional sample size produces higher static and cyclic shear strain resistance, but a much greater degree of scatter; and sample height had little obvious and consistent effects on cyclic shear results.
Download or read book Direct Simple Shear Testing for Post Cyclic Degradation in Stiffness of Nonplastic Silt written by BW. Song and published by . This book was released on 2004 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using a sequential procedure of cyclic and postcyclic direct simple shear tests, the stiffness degradation characteristics of nonplastic silt are studied during and immediately after cyclic loading by direct simple shear (DSS) tests. The results from cyclic and postcyclic DSS tests were interpreted using methods modified from those adopted for cyclic and postcyclic triaxial tests. In particular, the effect of initial static shear stress (ISSS) on postcyclic behavior is considered for nonplastic silt. The findings obtained from the sequential DSS testing on nonplastic silt are: (i) during cyclic loading the tendency of the stiffness to decrease with increasing normalized pore pressure is different for plastic and nonplastic silts, (ii) since the relation between equivalent stiffness ratio and single amplitude shear strain for nonplastic silt does not filt the Hardin-Drnevich Model, new modified relation is needed, (iii) the larger the ISSS is, the faster the decrease in stiffness ratio becomes, and (iv) the decrease of stiffness ratio for nonplatic silt is less marked than that for plastic silt when plotted against the normalized pore pressure after cyclic load.
Download or read book Crystal Plasticity Finite Element Methods written by Franz Roters and published by John Wiley & Sons. This book was released on 2011-08-04 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by the leading experts in computational materials science, this handy reference concisely reviews the most important aspects of plasticity modeling: constitutive laws, phase transformations, texture methods, continuum approaches and damage mechanisms. As a result, it provides the knowledge needed to avoid failures in critical systems udner mechanical load. With its various application examples to micro- and macrostructure mechanics, this is an invaluable resource for mechanical engineers as well as for researchers wanting to improve on this method and extend its outreach.
Download or read book Guidelines for Cyclic Seismic Testing of Components of Steel Structures written by Helmut Krawinkler and published by . This book was released on 1992 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics Briefs written by and published by . This book was released on 1990 with total page 1422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geo Congress 2013 Stability and Performance of Slopes and Embankments III written by Christopher L. Meehan and published by . This book was released on 2013-03-01 with total page 2280 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Geotechnical Special Publication contains 229 peer-reviewed technical papers and case studies focusing on the stability, performance, and rehabilitation of slopes, embankments, and dams. Topics include: exploration and characterisation of soil and rock slopesdesign, analysis, and performance of slopesmonitoring and inspection of slopeshazard assessment and managementground improvement and stabilisation in the repair and remediation of slopes. These papers are valuable to geotechnical researchers and practicing engineers, especially those interested in the design and maintenance of slopes, embankments and dams.
Download or read book Small strain Stiffness of Soils and Its Numerical Consequences written by Thomas Benz and published by . This book was released on 2007 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Engineered Materials Abstracts written by and published by . This book was released on 1994-02 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Soil and Rock Properties written by P. J. Sabatini and published by . This book was released on 2004-10-01 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document presents state-of-the-practice information on the evaluation of soil and rock properties for geotechnical design applications. This document addresses the entire range of materials potentially encountered in highway engineering practice, from soft clay to intact rock and variations of materials that fall between these two extremes. Information is presented on parameters measured, evaluation of data quality, and interpretation of properties for conventional soil and rock laboratory testing, as well as in situ devices such as field vane testing, cone penetration testing, dilatometer, pressuremeter, and borehole jack. This document provides the design engineer with information that can be used to develop a rationale for accepting or rejecting data and for resolving inconsistencies between data provided by different laboratories and field tests. This document also includes information on: (1) the use of Geographical Information Systems (GIS) and Personal Data Assistance devices for the collection and interpretation of subsurface information; (2) quantitative measures for evaluating disturbance of laboratory soil samples; and (3) the use of measurements from geophysical testing techniques to obtain information on the modulus of soil. Also included are chapters on evaluating properties of special soil materials (e.g., loess, cemented sands, peats and organic soils, etc.) and the use of statistical information in evaluating anomalous data and obtaining design values for soil and rock properties. An appendix of three detailed soil and rock property selection examples is provided which illustrate the application of the methods described in the document.
Download or read book Track Geotechnology and Substructure Management written by Ernest Theodore Selig and published by Thomas Telford. This book was released on 1994-10-05 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive study provides practical advice and guidance on the important topics of rail transport and ground engineering, the use of which will result in optimum quality with the minimum maintenance effort and the most economical use of resources. The authors have synthesized all of their international knowledge and experience in this field, and produced, for the first time, a definitive guide for the design, construction, maintenance and renewal of railway track as they relate to geotechnology.
Download or read book Geotechnical Modelling written by David Muir Wood and published by CRC Press. This book was released on 2017-12-21 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modelling forms an implicit part of all engineering design but many engineers engage in modelling without consciously considering the nature, validity and consequences of the supporting assumptions. Derived from courses given to postgraduate and final year undergraduate MEng students, this book presents some of the models that form a part of the typical undergraduate geotechnical curriculum and describes some of the aspects of soil behaviour which contribute to the challenge of geotechnical modelling. Assuming a familiarity with basic soil mechanics and traditional methods of geotechnical design, this book is a valuable tool for students of geotechnical and structural and civil engineering as well as also being useful to practising engineers involved in the specification of numerical or physical geotechnical modelling.
Download or read book Mechanics and Strength of Materials written by Vitor Dias da Silva and published by Springer Science & Business Media. This book was released on 2006-01-16 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gives a clear and thorough presentation of the fundamental principles of mechanics and strength of materials. Provides both the theory and applications of mechanics of materials on an intermediate theoretical level. Useful as a reference tool by postgraduates and researchers in the fields of solid mechanics as well as practicing engineers.
Download or read book Foundations of Elastoplasticity Subloading Surface Model written by Koichi Hashiguchi and published by Springer Nature. This book was released on 2023-06-12 with total page 850 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the standard text book for elastoplasticity/viscoplasticity which is explained comprehensively covering the rate-independent to -dependent finite deformations of metals, soils, polymers, crystal plasticity, etc. and the friction phenomenon. Concise explanations on vector-tensor analysis and continuum mechanics are provided first, covering the underlying physical concepts, e.g. various time-derivatives, pull-back and push-forward operations, work-conjugacy and multiplicative decomposition of deformation gradient tensor. Then, the rigorous elastoplastic/viscoplastic model, called the subloading surface model, is explained comprehensively, which is based on the subloading surface concept to describe the continuous development of the plastic/viscoplastic strain rate as the stress approaches to the yield surface, while it can never be described by the other plasticity models, e.g. the Chaboche-Ohno and the Dafalias-Yoshida models assuming the purely-elastic domain. The main features of the subloading surface model are as follows: 1) The subloading surface concept underling the cyclic plasticity is introduced, which insists that the plastic deformation develops as the stress approaches the yield surface. Thus, the smooth elastic-plastic transition leading to the continuous variation of the tangent stiffness modulus is described always. 2) The subloading-overstress model is formulated by which the elastoplastic deformation during the quasi-static loading and the viscoplastic deformation during the dynamic and impact loading can be described by the unified equation. Then, only this model can be used to describe the deformation in the general rate of deformation, disusing the elastoplastic constitutive equation. 3) The hyperelastic-based (visco)plasticity based on the multiplicative decomposition of deformation gradient tensor and the subloading surface model is formulated for the exact descriptions of the finite elastic and (visco)plastic deformations. 4) The subloading-friction model is formulated for the exact description of the dry and the fluid (lubricated) frictions at the general rate of sliding from the static to the impact sliding. Thus, all the elastic and inelastic deformation/sliding phenomena of solids can be described accurately in the unified equation by the subloading-overstress model. The subloading surface model will be engraved as the governing law of irreversible deformation of solids in the history of solid mechanics.
Download or read book Dynamic Geotechnical Testing written by M. L. Silver and published by ASTM International. This book was released on 1978 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
