Visualization of the Microstructural Response of Lightly-Cemented Granular Soils Under Uniaxial Strain Conditionsby John Gill,
Document Type: Proceeding Paper
Abstract: The microstructural response of granular soil under uniaxial strain is being investigated through direct observation of micromotions. Two techniques are being refined to quantify individual particle displacement, rotation, fracture, and disintegration as a function of applied macroscopic strain. 35mm cinema film records of the soil response are being examined using a commercially available motion analysis system. Alternatively, video images of the response are being analyzed using an automated system. Initial findings suggest the vertical displacement field within the specimen is highly non-linear with three 'zones' of response being formed during the loading phase of uniaxial strain application; a zone in which relatively high local displacements and strain occurs, a zone behind this 'front' wherein the particles move in direct relation to the advance of the loading cap, and a zone where the soil has not yet felt the influence of the advancing cap.
Subject Headings: Strain | Granular soils | Soil stress | Imaging techniques | Microstructure | Soil analysis | Displacement (mechanics) | Particles
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