Earth pressure coefficient at rest during secondary compression

Abstract

In order to obtain the earth pressure coefficient at rest (K₀) at higher consolidation pressures during secondary compression, a series of K₀ tests for saturated reconstituted clay were conducted. The results indicate that the measured K₀ in secondary compression can be described by equations related to internal friction angle, secondary compression coefficient, compression index, recompression index, and sediment time. Effects of consolidation pressures and sediment time on K₀ during secondary compression can be attributed to cementation (part of cohesion) increase and internal friction angle decrease. Cementation increase leads to nonlinear variation for K₀ and internal friction angle decrease results in increase of K₀. K₀ computed by equations associated with internal friction angle is overestimated at apparent lower consolidation pressures with different sediment time, which agrees with the measured values well at apparent higher consolidation pressures.

Keywords

earth pressure coefficient at rest / secondary compression / internal friction angle / cementation

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