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Author: Robert V. Whitman Publisher: ISBN: Category : Soil mechanics Languages : en Pages : 564
Book Description
Ground motion prediction formulas based upon elastic wave propagation in one-dimension (no strain transverse to the propagation direction) have been used widely in protective construction work. Actual soil materials exhibit many deviations from elastic behavior. This report assesses the probable influence of these non-elastic effects upon the accuracy of the above-mentioned prediction formulas, and upon the question of stress attenuation with depth. Three different models of soil behavior are assumed: a standard 3-element visco-elastic model (spring in series with spring-dashpot combination); a compacting model (straight line loading and unloading curves); and an ''elastic'' model in which any arbitrary shape may be assigned to the loading stress-strain curve. This report deals primarily with the first of these three models; the possible significance and probable importance of the third model are discussed briefly. By combining the theoretical and experimental results, it is shown that the elastic ground motion prediction formulas are generally valid (for cases where it is appropriate to think of one-dimensional motion); i.e. the possible effects of viscosity and inelasticity are no greater than uncertainties as to the order of magnitude of the compressibility of an in situ soil mass. (Author).
Author: Robert V. Whitman Publisher: ISBN: Category : Soil mechanics Languages : en Pages : 564
Book Description
Ground motion prediction formulas based upon elastic wave propagation in one-dimension (no strain transverse to the propagation direction) have been used widely in protective construction work. Actual soil materials exhibit many deviations from elastic behavior. This report assesses the probable influence of these non-elastic effects upon the accuracy of the above-mentioned prediction formulas, and upon the question of stress attenuation with depth. Three different models of soil behavior are assumed: a standard 3-element visco-elastic model (spring in series with spring-dashpot combination); a compacting model (straight line loading and unloading curves); and an ''elastic'' model in which any arbitrary shape may be assigned to the loading stress-strain curve. This report deals primarily with the first of these three models; the possible significance and probable importance of the third model are discussed briefly. By combining the theoretical and experimental results, it is shown that the elastic ground motion prediction formulas are generally valid (for cases where it is appropriate to think of one-dimensional motion); i.e. the possible effects of viscosity and inelasticity are no greater than uncertainties as to the order of magnitude of the compressibility of an in situ soil mass. (Author).
Author: Hoe I. Ling Publisher: Springer Science & Business Media ISBN: 1402061463 Category : Science Languages : en Pages : 989
Book Description
The material in this work is focused on recent developments in research into the stress-strain behavior of geomaterials, with an emphasis on laboratory measurements, soil constitutive modeling and behavior of soil structures (such as reinforced soils, piles and slopes). The latest advancements in the field, such as the rate effect and dynamic behavior of both clay and sand, behavior of modified soils and soil mixtures, and soil liquefaction are addressed.
Author: Thomas C. Sheahan Publisher: ISBN: Category : Technology & Engineering Languages : en Pages : 312
Book Description
The effects of time on the strength and deformation characteristics of various materials can assume importance in a variety of engineering problems. The time dependent mechanical behavior of soil is highly complex and can impact a broad range of applications such as in situ testing, seismic response, landslides, and embankment performance. This volume provides an update on the state of research and practice in the area of soil time effects. Emphasis is placed on laboratory and field developments, modeling time dependent behavior, rate dependence in a variety of soils, from subtropical soils to subglacial till, and on new applications such as soils reinforced with geosynthetics and inclusion dowels. Models are provided that include the influence of soil structure.
Author: Larry Schindler Publisher: ISBN: Category : Materials Languages : en Pages : 400
Book Description
A general-purpose test facility for determining the one-dimensional compression characteristics of soils subjected to impulse-type loads has been developed in order to help satisfy the ever-increasing demand for reliable soil-property data required in support of a wide variety of nuclear-weapons-effects-related problems. The design, fabrication, installation, and evaluation of the various elements which together comprise the test facility were accomplished. The various considerations involved in the design and evaluation of the newly developed test facility are discussed in detail, thus providing some insight into the types of factors which affect the experimental-accuracy capability of a one-dimensional compression test facility and thereby the reliability of the data obtained under any particular set of conditions. (Author).
Author: Publisher: ISBN: Category : Languages : en Pages : 36
Book Description
The Split-Hopkinson Pressure Bar was used to study the uniaxial stress-strain behavior of compacted moist soils under one-dimensional, undrained, confined compression loading at high strain rates (1000/sec and 2000/ sec. Three soils, Eglin Sand, Tyndall sand and Ottawa 20-20 sand were tested. The results suggest that the stress strain response is dominated by the water- phase from the lock-up strain and beyond. The soil skeleton dominates the response from the start of loading up to the lock-up strain. It appears that there may be some strain-rate effects, however, the data arc insufficient to adequately demonstrate this and further investigation is suggested. The research described in this report has demonstrated that the Split-Hopkinson Bar System is a viable technique for high strain rate dynamic geotechnical testing of unsaturated, saturated, and dry soils, and provides a framework for conducting further studies. Split-Hopkinson pressure bar, Tyndall sand, Ottawa 20-20 sand, Uniaxial stress strain.
Author: Robert V. Whitman
Author: Robert V. Whitman
Author: Hoe I. Ling
Author: Robert V. Whitman
Author: M. W. C. Emerson
Author: Thomas C. Sheahan
Author: Massachusetts Institute of Technology. Soil Mechanics Laboratory
Author: Larry Schindler
Author: Robert V. Whitman
Author: 
Author: Terrence John Hirst