Constitutive relations for partially saturated soils containing gas inclusions

Article Abstract:

A theoretical model to predict the behavior of soil containing gas bubbles has been developed. The model predicts a rise in the undrained shear strength with increase in gas content. During sampling, however, the confining pressure or total stress is reduced to zero which causes gas bubbles to expand and/or come out of solution. Therefore, laboratory tests performed on clays taken from the field will likely indicate a drop in undrained shear strength with an increase in gas content.

Soil mechanics, Shear strength of soils, Soil shear strength, Bubbles

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Earth pressures with sloping backfill

Article Abstract:

Authors Yung-Show Fang, Jiung-Ming Chen and Cheng-Yu Chen present significant experimental data on the active earth pressure for sloping backfill using Coulomb's theory. It is believed that for walls with sloping backfill, there will usually be higher compaction-induced earth pressures than with a level backfill. Thus, it is proposed that the theory take into account these compaction-induced pressures by including a factor of safety in the PA portion of the equation.

Models, Evaluation, Mathematical models, Criticism and interpretation, Slopes (Physical geography), Slopes (Landforms), Fang, Yung-Show, Chen, Jiung-Ming, Chen, Cheng-Yu

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Compressibility of clays: fundamental and practical aspects

Article Abstract:

A study on clay compressibility was conducted. Data was acquired from the construction of a 6-m-high embankment on a highly plastic, soft clay deposit. Results show that the soft clay's pore pressure increased for a period of 15-50 days after the construction was finished. Though structural viscosity is identified as the reason for the pore pressure increase, the rise may also be attributed to the lateral displacement of the soft clay.

Compressibility, Clay soils

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