10-04-2017, 09:02 PM
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The Mechanics of Biosolids
Kevin Tang
Professor Ian Collins, Dr. Tam Larkin
Department of Engineering Science
The University of Auckland
Biosolids is another term for treated sludge .
Instead of landfill, if biosolids are suitable to be used in embankment, rehabilitation of soil, quarries, Football fields etc.
Project Description
Determining a simple model for the mechanics of biosolids, using viscoplastic constitutive equations.
The soil Soil model.
Key notes:
Compressible, soft soil
Viscoplastic: rate dependent deformations/yielding.
Biosolids with a low permeability.
Cohesionless (in a drained test), non-zero cohesion in an undrained triaxial test.
Assumptions
Due to flattening nature of sample in a triaxial compression test. The material is regarded to yield at a maximum strain of 20%.
Solid is isotropic. Fibrous matter has negligible impact on direction material is loaded.
Assume a constant coefficient of consolidation.
Experiment tests
Triaxial test laboratory test that records the stress response to straining while it identifies shear strength, cohesion, phi angle.
Triaxial test models the shear-stress strain relationship of sample in compression.
The sample size are 150mm in height and 75mm in diameter.
Consolidation test: Volumetric strain from identifies the S, viscoplastic modulus.