Effect of Compaction and Increase of Saturation after Compaction on the Engineering Properties of Compacted Clay

摘要

Laboratory test specimens of kaolin clay were prepared at four levels of impact compaction effort over a wide range of moisture contents. The specimens were than wetted by capillarity either to their plastic limit (36 percent) under 2 to 4 psi lateral confinement, or to a lower moisture condition controlled by holding the specimen at constant volume. Unconfined creep and compression tests were made on the wetted speciments to measure their rheologic properties. Some of the conclusions were as follows: Where the stress was less than 20 percent of the unconfined compressive strength and the strain less than 0.5 percent, the saturated specimens behaved approximately as linear viscoelastic materials. Unconfined compressive strength decreased from 75 to 85 percent on saturation to the plastic limit and 30 to 60 percent when saturated at constant volume. Over the range of compaction examined, initial compaction energy had no significant effect on strength measured after saturation to the plastic limit. (BPR abstract)