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Author: John Q. Ehrgott Publisher: ISBN: Category : Shear strength of soils Languages : en Pages : 88
Book Description
The formulation of constitutive relations for use in computerized analyses of free-field ground shock phenomena is based primarily on laboratory-determined material properties. These properties, as described by stress-strain relations, are not directly determined in the laboratory, but are derived through interpretation of load and deformation data measured by the experimenter. Throughout this paper, one laboratory test, the triaxial shear test, is used to illustrate the extent of interpretation required on raw data and the influence of this interpretation on recommended constitutive properties. Various techniques that have been developed to obtain stress-strain data from the triaxial test are reviewed along with current advances in measurement systems. Typical raw data are presented and calculations of axial, lateral, and volumetric strains are made based on a variety of empirical and theoretical approaches. (Author).
Author: John Q. Ehrgott Publisher: ISBN: Category : Shear strength of soils Languages : en Pages : 88
Book Description
The formulation of constitutive relations for use in computerized analyses of free-field ground shock phenomena is based primarily on laboratory-determined material properties. These properties, as described by stress-strain relations, are not directly determined in the laboratory, but are derived through interpretation of load and deformation data measured by the experimenter. Throughout this paper, one laboratory test, the triaxial shear test, is used to illustrate the extent of interpretation required on raw data and the influence of this interpretation on recommended constitutive properties. Various techniques that have been developed to obtain stress-strain data from the triaxial test are reviewed along with current advances in measurement systems. Typical raw data are presented and calculations of axial, lateral, and volumetric strains are made based on a variety of empirical and theoretical approaches. (Author).
Author: Robert T. Donaghe Publisher: ASTM International ISBN: 0803109830 Category : Anisotropy Languages : en Pages : 896
Book Description
"Although the triaxial compression test is presently the most widely used procedure for determining strength and stress-deformation properties of soils, there have been no books published on triaxial testing since the 1962 second edition of the landmark work The Measurement of Soil Properties in the Triaxial Test by Bishop and Henkel. It is apparent there is a need to document advances made in triaxial testing since publication of Bishop and Henkel's book and to examine the current state of the art in a forum devoted solely to triaxial testing. Because of increasing versatility brought about by recent developments in testing techniques and equipment, it is also important that the geotechnical profession be provided with an up-to-date awareness of potential uses for the triaxial test."--Overview.
Author: Narayanaswamy Radhakrishnan Publisher: ISBN: Category : Electronic data processing Languages : en Pages : 202
Book Description
A finite element computer code called WESTES was developed to study the influences of laboratory testing equipment on the states of stress and strain induced in cylindrical specimens of earth media. The code can solve general static, axisymmetric, boundary value problems and is programmed to take an incremental, nonlinear constitutive model called the Variable Moduli Model II. Some of the special features of the code include the ability to simulate cyclic (load/unload/reload) laboratory tests using iterative treatments at the load/unload and unload/reload interfaces and special logic to separately handle loading and unloading in the volumetric and deviatoric stress components as dictated by the constitutive model. (Modified author abstract).
Author: Frank C. Townsend Publisher: ISBN: Category : Soils Languages : en Pages : 130
Book Description
The results of a series of consolidated-undrained (CU) triaxial compression tests performed on normally consolidated and overconsolidated specimes of two clays consolidated both isotropically (ICU tests) and anisotropically (ACU tests) are presented and analyzed in this report. The specimens were trimmed from samples of Vicksburg Buckshot clay (LL = 57) and a clay from the East Atchafalaya Basin Protection Levee (EABPL) project area (LL = 79), both of which had been consolidated from a slurry in large-diameter consolidometers under a maximum vertical consolidation pressure of 3.0 kg/sq cm. Data presented include stress-strain curves, pore pressure observations, final water content distributions within the specimens, and shear strength envelopes based on total and effective stresses. Test results indicate that the change in volume during consolidation and the water content at the end of consolidation are not a unique function of the vertical consolidation stresses but are related to the mean effective consolidation stress. Total stress envelopes based on Taylor's method of deriving strengths of anisotropically consolidated specimens from test results obtained from isotropically consolidated specimens slightly underestimate observed values. In this context, Taylor's method is an appropriate means of predicting strengths for various K sub c ratios from conventional ICU tests. Use of hyperbolic stress-strain relationships derived from ICU tests in finite element codes for ACU conditions will lead to erroneous results. Further testing of anisotropically consolidated soils under stress systems that better simulate in situ conditions is needed.
Author: Poul V. Lade Publisher: John Wiley & Sons ISBN: 1119106591 Category : Technology & Engineering Languages : en Pages : 424
Book Description
Triaxial Testing of Soils explains how to carry out triaxial tests to demonstrate the effects of soil behaviour on engineering designs. An authoritative and comprehensive manual, it reflects current best practice and instrumentation.References are made throughout to easily accessible articles in the literature and the books focus is on how to obtain high quality experimental results.
Author: L. T. Shao Publisher: ISBN: Category : Deformation distribution Languages : en Pages : 15
Book Description
A digital image technique was developed and used to measure the deformation distribution over the entire surface of soil specimens in triaxial tests. The measured deformation process shows that the specimen apparently exhibits three states during the test, i.e., pre-failure, in-failure, and post-failure, in correspondence to the different features of its deformation. The deformation feature in each state is then analyzed by the displacement and strain contours. Additionally, the stress level, S, is calculated to determine whether the soil is in failure at a point (representative element volume (REV)) on the surface of the specimen. Next, the failure zone, namely the shear band, was considered to be enveloped by the curve defined by S = 1 on the stress-level contour map. The stress level is calculated based on the strain, Young's modulus and Poisson's ratio. According to analysis of the deformation feature and the failure process, we recognized the following properties: (i) the deformation of the specimen was approximately uniform in the pre-failure state; (ii) failure occurred from a point and developed gradually until the shear band cleaves the specimen; (iii) in the post-failure state, deformation was exclusively due to the blocks of the specimen sliding along the shear band; (iv) the deformation feature in the shear band was quite different from that outside the shear band. In conclusion, the stress-strain curve of the specimen revealed a structural response, not an elementary response, especially in the in-failure and post-failure states, in which the deformation features of different corner points were different, and the observed deformation for the entire specimen may be the combination of local deformations. Therefore, it is not appropriate to build the constitutive model for soil according to the stress-strain curves of the entire deformation process and to take the specimen as a uniform element in the entire process.
Author: Braja M. Das Publisher: ISBN: Category : Technology & Engineering Languages : en Pages : 264
Book Description
Now in its sixth edition, Soil Mechanics Laboratory Manual is designed for the junior-level soil mechanics/geotechnical engineering laboratory course in civil engineering programs. It includes eighteen laboratory procedures that cover the essential properties of soils and their behavior under stress and strain, as well as explanations, procedures, sample calculations, and completed and blank data sheets. Written by Braja M. Das, respected author of market-leading texts in geotechnical and foundation engineering, this unique manual provides a detailed discussion of standard soil classification systems used by engineers: the AASHTO Classification System and the Unified Soil Classification System, which both conform to recent ASTM specifications.To improve ease and accessibility of use, this new edition includes not only the stand-alone version of the Soil Mechanics Laboratory Test software but also ready-made Microsoft ExcelRG templates designed to perform the same calculations. With the convenience of point and click data entry, these interactive programs can be used to collect, organize, and evaluate data for each of the book's eighteen labs. The resulting tables can be printed with their corresponding graphs, creating easily generated reports that display and analyze data obtained from the manual's laboratory tests.FeaturesBL Includes sample calculations and graphs relevant to each laboratory testBL Supplies blank tables (that accompany each test) for laboratory use and report preparationBL Contains a complete chapter on soil classification (Chapter 9)BL Provides references and three useful appendices:Appendix A: Weight-Volume RelationshipsAppendix B: Data Sheets for Laboratory ExperimentsAppendix C: Data Sheets for Preparation of Laboratory Reports
Author: John Q. Ehrgott
Author: John Q. Ehrgott
Author: Robert T. Donaghe
Author: Rául F. Esquivel-Díaz
Author: Narayanaswamy Radhakrishnan
Author: Frank C. Townsend
Author: Alan Wilfred Bishop
Author: R. H. Prysock
Author: Poul V. Lade
Author: L. T. Shao
Author: Braja M. Das