Study on Energy Evolution of Cyclic Loading/Unloading Test of Subgrade Improved Soil
The cyclic loading/unloading test was carried out to analyze the energy parameter transformation law of the improved soil of highway subgrade under loading.The results show that the energy conversion of subgrade improved soil under different confining pressures is similar,showing pre-peak energy accumulation,failure energy dissipation,post-peak residual strength energy re-accumulation,but the efficiency and total amount are lower than pre-peak.Confining pressure has little effect on the energy parameters of the subgrade improved soil at pre-peak,but slightly increases the effect of energy accumulation at residual strength.Before the peak,the energy consumption ratio K slowly decreases with the increase of axial strain.When the soil strength fails,the energy consumption ratio K suddenly changes.The mutational site of the energy consumption ratio K corresponds to the inflection point of stress-time curve,indicating that the energy consumption ratio can be used as the strength failure characteristic of the subgrade improved soil under cyclic loading/unloading under triaxial stress state,and can also explain the evolutionary failure law of subgrade improved soil from the perspective of energy.
improved soilcyclic loading/unloadingradial strainenergy evolutionparameter proportioncriteria for strength failure
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