The Resistance of Soil Structure to Consolidation

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Abstract
The rate at which soil specimens are compressed in the standard consolidation test is farther from reality than the rate of strain in any other test. For a short period after the application of a load increment the rate of compression may be several million times faster than that experienced in the field. This paper describes a series of tests carried out at constant rates of compression varying from 0.16 to 8 per cent per hour in which pore pressures were measured. The effective stress-compression curves are compared with an average curve obtained by incremental loading. Based on these results, it is concluded that the compressibility of this soil is dependent on the average rate of compression and that the soil structure has a substantial time-dependent resistance to compression. This time-dependent resistance may be expected to have a significant influence on computed permeability coefficients and field rates of consolidation.

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