Abstract: A number of conventional consolidated drained triaxial compression tests of cemented gravelly soil were performed; and the stress-strain relationships and strength behaviors of the soil were investigated at different cement mixing ratios. The test results show that as the cement mixing ratio increases, the stress-strain relationship of cemented gravelly soil exhibits various degrees of softening and dilatancy under different confining pressures; and especially under low confining pressure (200 kPa) and high cement mixing ratio (8%), the dilatancy of soil is more evident. Under the same mixing ratio of cement, the peak strength is nearly linearly increasing with the increase of confining pressure. Compared with gravelly soil without cement, friction angle φ of cemented gravelly soil increases in different degrees due to the different amounts of cement mixed into the gravelly soil. Cohesion c of cemented gravelly soil shows a growing tendency with cement mixing ratio increasing; and the tendency is more remarkable for cohesion c. The secant moduli of and increase with the increase of confining pressure and cement mixing ratio. Three dimensional finite element analysis results indicate that using cemented gravelly soil as the core will greatly decrease the settlement of earth-rock dam.

Key words: cemented gravelly soil, cement mixing ratio, strength property, triaxial compression test