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THE ELASTIC MODULI OF SOILS WITH DISPERESED OVERSIZE PARTICLES

Lobo-guerrero, Sebastian (2002) THE ELASTIC MODULI OF SOILS WITH DISPERESED OVERSIZE PARTICLES. Master's Thesis, University of Pittsburgh.

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    Abstract

    To calculate the elastic deformations experienced by soils subjected to static or dynamic loads, knowledge of the elastic constants is required. The elastic constants (poisson's ratio, E, G) are normally evaluated in the laboratory using conventional triaxial compressive tests on cylindrical samples. For meaningful test results, it is necessary to maintain a ratio of sample diameter to the maximum particle size of approximately 6 to 1 or greater. However, some soils have large and dispersed oversize particles that make it impossible for them to be tested in the conventional triaxial apparatus. This study presents the application of theoretical models that calculate the elastic properties of a composite made of an elastic matrix containing large dispersed particles. The presented models require only knowledge of the elastic properties of the matrix coupled with the concentration by volume of the large particles in order to calculate the elastic properties of the mixture. These models were applied to different mixtures under different conditions of vertical pressure and moisture content. It was found that the models predict very well the measured elastic properties. The measurement of the elastic properties was carried out using an ultrasonic velocity apparatus. It should be noticed that most of the tests presented in this research are related to the dynamic elastic properties of the mixtures; however, it was found that most of these models could be applied in order to predict the static elastic properties too.

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    Details

    Item Type: University of Pittsburgh ETD
    ETD Committee:
    ETD Committee TypeCommittee MemberEmail
    Committee ChairVallejo, Luis Evallejo@civ.pitt.edu
    Committee MemberChiu, Chao Linchiu@civ.pitt.edu
    Committee MemberLin, Jeen Shangjslin@civ.pitt.edu
    Title: THE ELASTIC MODULI OF SOILS WITH DISPERESED OVERSIZE PARTICLES
    Status: Unpublished
    Abstract: To calculate the elastic deformations experienced by soils subjected to static or dynamic loads, knowledge of the elastic constants is required. The elastic constants (poisson's ratio, E, G) are normally evaluated in the laboratory using conventional triaxial compressive tests on cylindrical samples. For meaningful test results, it is necessary to maintain a ratio of sample diameter to the maximum particle size of approximately 6 to 1 or greater. However, some soils have large and dispersed oversize particles that make it impossible for them to be tested in the conventional triaxial apparatus. This study presents the application of theoretical models that calculate the elastic properties of a composite made of an elastic matrix containing large dispersed particles. The presented models require only knowledge of the elastic properties of the matrix coupled with the concentration by volume of the large particles in order to calculate the elastic properties of the mixture. These models were applied to different mixtures under different conditions of vertical pressure and moisture content. It was found that the models predict very well the measured elastic properties. The measurement of the elastic properties was carried out using an ultrasonic velocity apparatus. It should be noticed that most of the tests presented in this research are related to the dynamic elastic properties of the mixtures; however, it was found that most of these models could be applied in order to predict the static elastic properties too.
    Date: 02 December 2002
    Date Type: Completion
    Defense Date: 29 October 2002
    Approval Date: 02 December 2002
    Submission Date: 04 November 2002
    Access Restriction: No restriction; Release the ETD for access worldwide immediately.
    Patent pending: No
    Institution: University of Pittsburgh
    Thesis Type: Master's Thesis
    Refereed: Yes
    Degree: MSCE - Master of Science in Civil Engineering
    URN: etd-11042002-133557
    Uncontrolled Keywords: compression wave; dynamic elastic moduli; poisson’s ration; soil mixtures; static elastic moduli; shear wave; ultrasonic velocity
    Schools and Programs: Swanson School of Engineering > Civil and Environmental Engineering
    Date Deposited: 10 Nov 2011 15:04
    Last Modified: 08 May 2012 13:53
    Other ID: http://etd.library.pitt.edu:80/ETD/available/etd-11042002-133557/, etd-11042002-133557

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