ON THE SECONDARY COMPRESSION OF SATURATED CLAYS.
Phase rept. no. 6 on Research in Earth Physics.
MASSACHUSETTS INST OF TECH CAMBRIDGE SOIL MECHANICS DIV
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Secondary compression refers to a volume decrease which occurs under conditions of seemingly constant effective stress at the end of primary consolidation, i.e., after excess pore pressures are essentially dissipated. Experimental data are presented on the effects of stress history and type of stress system on the rate of secondary compression of two saturated remolded clays, namely a lean silty clay Boston Blue Clay - BBC and a silty clay of high plasticity Vicksburg Buckshot Clay - VBC. The stress systems studied are one-dimensional compression with K sub o stresses as represented by the conventional oedometer test and isotropic compression K 1 as measured in a standard triaxial cell with a uniform pressure. The oedometer and triaxial test data on BBC yielded the same rate of secondary compression the data on VBC were inconclusive. Data by Ray 1963 on this topic, which showed a marked effect of the value of K on the rate of secondary compression, are presented and analysed. The effects of stress history and stress system are discussed in terms of soil structure structure equals fabric plus interparticle forces. Author
- Soil Mechanics