Study On The Deformation Of Soft Ground Under Traffic Loads

Traffic loads have great impacts on the lifespan of roads. Nowadays, roads are developing rapidly, especially in coastal areas, in such areas as these, a great partition of ground consists of soft soil. And the key point in building roads on soft ground is to solve its deformation. In this paper, the study on the deformation of soft ground under traffic loads is carried out, main content is as follows:(1) Given a summarization on the engineering properties and current status of the study on soft soil, carried out some researches on the dynamic characteristics of soft soil in Bao Ying, and the formula for residual deformation of soft clay is deduced.(2) Given a summarization on the characteristic and current status of study on traffic loads. based on the measured traffic data on a road in Yangzhou, traffic load simulation formula is established. A user subroutine on traffic loads is written, and a simulation verification is carried out with Abaqus, respectively in2D and3D conditions. Results show that a sin-wave moving load in3D condition is more reasonable than others.(3) Defined the deformation law of soft ground using Hardin constitutive model, which is written into user subroutine to simulate the dynamic behavior in Abaqus. Based on that and the results above, a moving load posed on a road with soft ground in3D condition is simulated. Analysis towards the total shear strain, the cumulative settlement and load influence depth are all analyzed, so does the comparing the results with other researchers’.(4) Sensitive factors of the deformation of soft soil under traffic loads are analyzed. Results show that as the embankment height or the road surface elastic modulus increases, the dynamic response of soft ground will decrease, accordingly, so do the influence depth of traffic loads and the maximum settlement of the ground, In general, the influence of embankment height on the dynamic response of soft ground is greater.