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Experimental Investigations On Small-strain Stiffness Properties Of Partially Saturated Soils Via Resonant Column And Bender Element Testing

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Experimental Investigations On Small-strain Stiffness Properties Of Partially Saturated Soils Via Resonant Column And Bender Element Testing

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dc.contributor.author Takkabutr, Phayak en_US
dc.date.accessioned 2007-08-23T01:56:04Z
dc.date.available 2007-08-23T01:56:04Z
dc.date.issued 2007-08-23T01:56:04Z
dc.date.submitted August 2006 en_US
dc.identifier.other DISS-1392 en_US
dc.identifier.uri http://hdl.handle.net/10106/103
dc.description.abstract A comprehensive series of resonant column (ASTM D 2325-68), bender element (ASTM C 778), pressure plate (ASTM D 4015-92), and filter paper (ASTM D 5298) tests were conducted on compacted specimens of poorly graded sand (SP) and high plasticity clay (CH) in order to assess the influence of key environmental factors, namely compaction-induced matric suction and Ko stress state, on small-strain stiffness properties of partially saturated soils. Compaction-induced matric suction in all test specimens was estimated via soil-water characteristic curves (SWCC) for each type of soil. The research work was accomplished in six broad stages. During Stage I, a modified pressure plate extractor device was developed for assessing SWCC under anisotropic stress sates. Results from a series of SWCC tests on SP and CH specimens were used to assess the Fredlund and Xing's SWCC model parameters for each type of soil. During Stage II, resonant column (RC) tests were conducted on SP and CH specimens, at different compaction-induced suctions and isotropic confinements, in order to devise correlations between small-strain stiffness properties, shear modulus (Gmax) and material damping (Dmin), and matric suction. During Stage III, bender element (BE) tests were conducted on SP and CH specimens for the same experimental variables as in Stage II. Results were used to investigate the influence of suction on bender element performance as compared to resonant column testing. During Stage IV, bender element (BE) tests were conducted on SP and CH specimens at different compaction-induced suctions and Ko stress states. Results were used to devise a correction factor for RC results, on the basis of initial compaction-induced suction, for any given Ko stress condition. During Stage V, a series of RC and BE tests were conducted on SP and CH specimens using a resonant column device with self-contained bender elements. Results were used to further substantiate the experimental findings and correlations devised in Stages II, III and IV. Finally, during Stage VI, bender element tests were conducted on SP and CH specimens sheared at different vertical strain levels in order to assess the influence of vertical strain level on suction loss and menisci regeneration patterns. en_US
dc.description.sponsorship Hoyos, Laureano en_US
dc.language.iso EN en_US
dc.publisher Civil & Environmental Engineering en_US
dc.title Experimental Investigations On Small-strain Stiffness Properties Of Partially Saturated Soils Via Resonant Column And Bender Element Testing en_US
dc.type Ph.D. en_US
dc.contributor.committeeChair Hoyos, Laureano en_US
dc.degree.department Civil & Environmental Engineering en_US
dc.degree.discipline Civil & Environmental Engineering en_US
dc.degree.grantor University of Texas at Arlington en_US
dc.degree.level doctoral en_US
dc.degree.name Ph.D. en_US
dc.identifier.externalLink https://www.uta.edu/ra/real/editprofile.php?onlyview=1&pid=964
dc.identifier.externalLinkDescription Link to Research Profiles

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