Study of the Dynamic Stress-strain and Wave-propagation Characteristics of Soils PDF Download
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Author: W. L. Durbin
Publisher:
ISBN:
Category : Sand
Languages : en
Pages : 64
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Book Description
Author: W. L. Durbin
Publisher:
ISBN:
Category : Sand
Languages : en
Pages : 64
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 60
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Book Description
Wave propagation studies conducted on laterally confined columns of three granular materials which exhibit nonlinear stress-strain behavior are described. Under these conditions, axial and lateral stresses and strains, wave velocities, and particle velocities measured at points along the column are reported. A new technique for measuring free-field displacements without physically contacting the soil is also described. A correlation between the moduli computed from the stress wave velocity, particle velocity, and the secant drawn to the stress-strain curve is presented. Relationships between stress, strain, wave velocity, and particle velocity are shown to be such that if any two of the parameters are known, the other two may be determined. Comparison of the data is made with the Hertzian theory relating confining stress to wave velocity or constrained modulus. Several interesting though preliminary observations on stress precursors resulting from initial axial stresses are presented. Based on these observations, an explanation is presented for the disparity between moduli based on constrained compression tests and those back- figured from seismic velocities.
Author: James Walsh McNulty
Publisher:
ISBN:
Category : Arches
Languages : en
Pages : 216
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Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 684
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Author: James V. Zaccor
Publisher:
ISBN:
Category : Shock waves
Languages : en
Pages : 222
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Book Description
The report describes a definitive experimental study in which shock-induced square-wave pulses in soil were observed to give way to decaying pulse shapes, as in a gas shock tube, and rapid attenuation of peak stress occurred thereafter due to nonlinear propagation in the rarefaction. In the study three different duration pulses were applied to an 8-ft vertical column of granular material confined under boundary conditions leading to a stress-strain (Sigma - Epsilon) behavior described by d to the 2nd power Sigma/d Epsilon to the 2nd power> 0, i.e., a strain-hardening type of response. Applied stresses ranged from 50 to 500 psi. The report describes a simple modification to be applied to the prediction procedure described in the first report of this series in order to take into account, to a first approximation, the nonlinear propagation of unloading waves that occurs in real media because of nonlinear stress-strain behavior in the unloading branch. The procedure which predicts stress and motion histories based on the conservation laws, a measured constitutive relationship, and the applied pressure-time profile, is demonstrated by predicting the entire sequence of an experimentally observed square-wave pulse transformation into a decaying pulse. (Author).
Author: U.S. Army Engineer Waterways Experiment Station
Publisher:
ISBN:
Category : Hydraulic engineering
Languages : en
Pages : 430
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Author: Waterways Experiment Station (U.S.)
Publisher:
ISBN:
Category : Hydraulic engineering
Languages : en
Pages : 322
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Author: United States. Army. Corps of Engineers
Publisher:
ISBN:
Category :
Languages : en
Pages : 130
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Author: W. L. Durbin
Publisher:
ISBN:
Category : Sand
Languages : en
Pages : 108
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This report describes three types of constrained compression tests, and results thereof, on dry sands. In most tests, lateral confinement was provided by a ring boundary that inhibits radial displacements while offering little resistance to axial strains. In addition, comparisons are made between results of tests in this boundary and those in the United Research Service fluid boundary. Stress-time and displacement-time records obtained from interior points along the column, indicating shocking-up, are included. Predicted peak particle velocities and shock-wave propagation velocities based on the stress-strain data are presented and compared with measured values. (Author).
Author:
Publisher:
ISBN:
Category : Sand
Languages : en
Pages : 186
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