Assessment Method of Resilient Modulus for Earth-rock Subgrade Based on Modal Analysis
In order to explore a rapid method for determining the resilient modulus of earth-rock subgrade,the compacted road subgrade was considered as a multi-degree-of-freedom system.Based on the experimental modal analysis theory,the vibration modal and resilient modulus tests of earth-rock subgrade were carried out using the hammering method and load-bearing plate method,respectively.Levy method was used to identify the natural frequency and damping ratio of the subgrade,and the empirical equations between the two modal parameters and the resilient modulus of the subgrade were established.The results show that the 1st to 3rd natural frequencies,the 1st to 3rd damping ratios of the subgrade correlate significantly with the resilient modulus,indicating that the modal parameters of the compacted subgrade can be used to achieve rapid assessment of the resilient modulus of the subgrade.In practice,the regression equation with the strongest relevance between the selected modal parameters of the subgrade and the resilient modulus can be established through trial section at construction site,and then the resilient modulus can be obtained through the vibration modal test and the equation on the normal section.
万方数据
维普
