1.Road &2.Bridge International Co. Ltd.;3.Changsha University of Science and Technology
Jiangxi Transportation Science and Technology Project
The dynamic resilience modulus of reinforced subgrade is an important design index of reinforced soil technology in road engineering. In this paper, the dynamic resilience modulus test of geogrid-reinforced reinforced gravel soil was carried out by dynamic triaxial apparatus, the influence law of water content, reinforcement mode, the shear and lateral influence characterization in the dynamic resilience modulus were comparatively analyzed, the dynamic resilience modulus prediction model parameters were analyzed by regression. Experimental results showed that the dynamic resilience modulus of reinforced soil reduced with the increase of moisture content. The geogrid should be laid in the horizontal shear deformation layer in the soil, the dynamic resilience modulus could be obvious improved by increasing the number of reinforcement layers or reducing the spacing of layers. When other conditions remained unchanged, the dynamic resilience modulus increased with the increase of shear and lateral influence characterization. The parameter regression results of the NCHRP 1-28A model were satisfactory, the model could be used to predict the dynamic resilience modulus of geogrid-reinforced reinforced soil. The above test and analysis results can provide the pavement structure design basis of dynamic resilience modulus of reinforced soil subgrade, promote the application of reinforced soil technology in road engineering.