Analysis of Failure Properties of Expansive Soil Subgrade with Particle Flow Simulation

Research purposes:Expansive soil has the characteristics of intensive dilation shrinkage and is often in a non-satruated situation.Its strength and volume change with the change of water content,resulting in destruction of buildings.For construction of the expansive soil subgrade of Yuxi-Mengzi Railway,by using particle flow discrete element method,the numerical simulation of wet and dry sizing effect in expansive soils was made with the beginning of changing particle intensity and swelling-shrinking particle size,and the analysis of its failure characteristics and process was made. Research conclusions:The particle flow discrete element method can reasonably reproduce interior expansive soli and free expansion rate tests with the equilibrium swelling pressure method.From doing the single simulation test and multiple simulation tests to the expansive soil subgrade,the superficial zone slump phenomenon of the expensive soil subgrade under swelling-shrinkage cycle is revealed in the microscopic point of view.Contrasting the failure characteristics of the filled embankment shows the situation of numerical simulation almost tallies with the site situation.