Study on Deformation Characteristics of Low-Highway Subgrade under Traffic Load

Highway subgrade bears millions of traffic loads over the years, and its strength, stiffness, long-term stability gradually decline. In this paper, dynamic triaxial tests were carried out to study time evolution spatial distribution strain pore pressure highway-subgrade soil under action load. The influence load on deformation was analyzed. Furthermore, a numerical-calculation model established. characteristics driving main conclusions can be drawn as follows: (1) With increase in loading times, cumulative roughly divided into three stages: rapid-growth stage, slow-growth equilibrium stage. (2) pore-water decreases rapidly with depth. (3) amplitude has tremendous soil, especially for shallow subgrade. (4) As distance from surface increases, maximum appears at edge