EXPERIMENTAL VERIFICATION OF CRS CONSOLIDATION THEORY

The paper presents and analyzes results from nine constant rate of strain (CRS) consolidation tests on resedimented Boston blue clay (BBC) using a specially instrumented, computer-automated hydraulic consolidation device. Specimens were loaded using one of three vertical strain rates (0.1, 1, and 3%/h), and pore pressures were measured at three points through the specimen height and at the base. The CRS results were compared to the end of primary states in four incrementally loaded (IL) oedometer tests performed using standard procedures. At the two faster CRS rates, excess pore pressures (Δu) developed and two methods were used to compute vertical effective stress (σv′): nonlinear CRS theory of Wissa et al. that depends in part on Δu measured only at the base; and direct integration of the measured Δu distribution through the specimen (the “isochrone method”). The results show that at the two faster rates, the CRS tests based on nonlinear CRS theory are consistent with those obtained using the isochrone ...

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