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The conventional fill compaction procedure controlling the dry density ρd and the water content w has several limitations due mainly to significant effects of compaction energy level CEL and soil type on the ρd vs. w relation of compacted soil despite great difficulty in the prediction of in-situ CEL and soil type. The optimum degree of saturation (Sr)opt defined as Sr where (ρd)max is obtained for a given CEL and the ρd/(ρd)max vs. Sr (Sr)opt relation of compacted soil are independent of CEL and insensitive to soil type variation. The unsoaked and soaked strength and stiffness and the saturated coefficient of hydraulic conductivity k are controlled by ρd and “Sr during compaction” and can be represented by empirical equations with variables of ρd and compacted Sr, not including CEL. A new compaction control method achieving compacted Sr close to (Sr)opt and compacted ρd large enough for the soil properties required in design of a given soil structure, with pre-compaction control of water content, is proposed.

Properties of compacted soil as a function of dry density and the degree of saturation