Influence of Moisture Content Change Cyclicity on Modulus Evolution Law of Cohesive Subgrade Soil
Dongxu Li · Journal of Tongji University · 2013
After experiencing a repeated dry-wet cycle,the mechanical properties of the subgrade soil show irreversible changes.An indoor test was carried out to investigate the influence of the moisture content changes cyclicity on resilience modulus of the cohesive subgrade soil.And the extent of the resilience modulus attenuation of subgrade result in frequently dry-wet cycle was analyzed.A series of humidity cycle such as water seepage under the permeable stone-standing-oven dehydration were repeated to imitate the scene of the subgrade soil moisture content fluctuation process.The resilience of subgrade soil was tested by the system of UTM.The results show that the moisture content changes cyclicity influences the resilience modulus of cohesive subgrade soil.The resilience modulus decreases against the increase of cycle times.On the same stress state,the higherthe equilibrium moisture content is,the more sensitive the resilience modulus changes are.As a result,the resilience modulus tends to be unstable.