EXPERIMENTAL RESEARCH ON RESILIENT MODULUS OF REMOLDED SOIL BASED ON WATER CONTENT AND FREEZE-THAW CYCLES

To simulate the effect of natural environmental factor on the mechanical performance of artificial filling subgrade,the experiments were carried out on the remolded soil and the changing law of the soil resilient modulus with water content and the numbers of freeze-thaw cycles were studied.By the static molding method,the soil sample was compacted from the optimal water contents.The water content of the soil sample was changed by drying and humidification process.After different freeze-thaw cycles,the unconfined resilient moduli of the soil sample were tested respectively.The experiments show that for the compacted soil from the optimal water content,the first change of water content is key factor to affect the resilient modulus of the soil.The change of resilient modulus is most sensitive to water content of 8%-17%.The resilient modulus of the soil with different water contents decrease,totally with the increase of the numbers of the freeze-thaw cycles.However,the resilient modulus tends to be stable after six freeze-thaw cycles.With the same numbers of freeze-thaw cycles,the decreasing magnitude of resilient modulus reduces with the reduce of water content during the drying process after the soil is compacted and remolded;while the decreasing magnitude keeps steady during humidification process.