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Stress-density relationships for an agricultural soil
Triaxial tests under high loading rates and different confining pressures simulate the
multi-pass effect of a tractor wheel loading on the soil. A volume measuring technique
was developed to be used in triaxial tests conducted under high loading rates.
A sandy clay agricultural soil was tested under predetermined conditions using an
INSTRON loading frame, a differential pressure transducer and an APPLE Il + microcomputer.
A preliminary analysis indicated that the measuring technique that was
developed, was capable of recording volume changes under high loading rates.
Stress-density plots were created using the obtained data and a mathematical model
was developed relating stress to density. Stress-strain data was used to evaluate the
soil parameters under the Mohr-Coulomb failure criteria. Furthermore, the influence
of the initial soil density on the soil behavior was evaluated and subsequently compared
to the results of a similar study conducted under a different initial density.