The Analysis on Coefficient of Horizontal Subgrade Reaction of the Guardrail in the Highway

Abstract

For exactly analyzing the course of the coupling impact of auto and protective guard pillar, it’s especially important to get the analytical solution of the coefficient of horizontal subgrade reaction of the horizontal column of protective guard pillar. Using the reaction relationship of soil density and horizontal load ,we build up the estimate theory of the coefficient of horizontal subgrade reaction, with a simple form, describing the relationship of horizontal subgrade reaction and horizontal displacement. Using the Mohr-coulomb yield criterion and the finite element numerical simulation result of ABAQUS, we found that during the column rotary deformation, the coefficient of horizontal subgrade reaction is not a constant ,but it will be smaller and smaller with the development of the deformation. Plastic yield of protective guard pillar and earth coupling model soil caused by horizontal load depends on the difference in value of the max stress component and the min stress component, at the same time raising a theoretical formula of the coefficient of horizontal subgrade reaction and ultimate bearing capacity of soil and setting the theoretical model of coefficient of horizontal subgrade reaction under the horizontal load ,to provide a reference of design and analyze for the practical project.