Protocol for Cohesionless Sample Preparation for Physical Experimentation
Geotechnical and Structures Laboratory,U.S. Army Engineer Research and Development Center Vicksburg United States
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The construction method and applied energy significantly influence sample behavior and strength characteristics therefore, an energy-based sample reconstitution method is derived wherein uncertainties and laboratory scatter associated with soil fabric-behavior variance during sample preparation are mitigated. Samples of two different sands prepared using relative density methods resulted in different strengths at the point of failure however, when prepared to the same normalized density, the same strength at the point of failure was observed. This suggests that normalized density could be a useful approach for laboratory investigation of cohesionless materials. The procedure developed controls the three principal components of sample reconstitution, masstype of material, quantity of water, and quantitymeans of applied energy. All other properties, e.g., density, void ratio, etc., are products of sample preparation. Therefore, by controlling the three principal variables in sample preparation, high sample repeatability can be readily achieved wherein comparable analysis between different laboratory tests results can be made by ensuring a comparable soil fabric prior to laboratory testing.
- Soil Mechanics