Rheological Mechanics Of Compacted Clay And Prediction Of Post-construction Settlement Of High-filled Embankment

With the western development strategy entering the accelerated development stage, thetransportation system has become perfect day by day. It appears more and more high-filledembankment for highway construction in these areas. The quality of high-filled embankmentis closely related to properties of compacted clay. The settlement of high-filled embankmenthas become a very important topic in the field of scientific technology of highwayconstruction, but the method of post-construction settlement still need further supplement andimprovement.Based on artificial preparation of compacted clay of the embankment, this paper hascarried out the test on rate sensitivity and consolidation creep about compacted clay and itaims at analyzing the rheological mechanics of compacted clay. In order to provide thereference of research experience, the post-construction settlement of high-filled embankment hasbeen analysed by the software ABAQUS. The main contents include:Firstly, based on geotechnical test regulations, the triaxial CD rate sensitivity test whichthe compacted clay under different confining pressure has been carried out. The results showthat the effect of loading rate on mechanics of compacted clay is very remarkable, and the CDpeak strength presents the tendency of that decreased first then increased along with theincrease of loading rate, and seems to be the phenomenon of critical speed; The stress-strainrelationship of compacted clay appears strain softening under the low confining pressure, andthe results show that it has formed the remolding overconsolided clay because of the stresshistory accumulated in the compaction process. In addition, it enhances the phenomena ofstrain softening with the increasing of the degree of compaction.Secondly, the one-dimensional consolidation creep test based on the compacted clayunder staged loading is carried out, through the analysis of curve relationship between strainand logarithmic time as well as void ratio and logarithmic time of the compacted clay. Itshows that the compacted clay has obvious nonlinear creep deformation, and this nonlinearcreep phenomenon is more significant under the higher stress level. In the same conditions,when the degree of compaction is greater, the structural strength of compacted clay is moresignificant and its final cumulative deformation is smaller. In addition, the creep equationwith the logarithmic form of the compacted clay is fitted, the relationship between the stressand the strain of compacted clay is described by the power function creep model including theinfluence of stress and the deformation of compacted clay is explained through microcosmicangle. Thirdly, based on the rheological mechanics of compacted clay, the modal based on thehigh-filled embankment of Lanlin highway K5+536engineering is builded to complete thesimulation of the layered filling through the large FEM software ABAQUS. Comparing thecalculated results with measured results, the settlement laws of high-filled embankment isdiscussed to provide a reference for the study of settlement laws of high-filled embankmentand the post-construction settlement prediction.