Microstructure Features and Dynamic Macro-Behavior of a Multiphase Particulate Material
Final rept. 1 May-31 Dec 97
DISTRICT OF COLUMBIA UNIV WASHINGTON DEPT OF CIVIL ENGINEERING
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The long term goal of this study is to provide a fundamental understanding of the liquefaction behavior of a multiphase particulate material consisting of gravel, sand, and silt at both macroscopic and microscopic levels. The main objective of this research project was to compare the behavior of stratified and homogeneous sand-silt-gravel composites at the macroscopic level during seismic liquefaction conditions for various silt and gravel contents. A preliminary experimental program was undertaken in which a total of fifty stress-controlled undrained cyclic triaxial tests were performed. Two methods of sample preparation were used for each soil type. These methods included moist tamping representing uniform soil conditions and sedimentation representing layered soil conditions. The silt contents ranged from 0 to 50 percent, and soils with 10 and 30 gravel contents were tested. The confining pressure in all test series was 100 KPa.
- Soil Mechanics