| Taking the typical soft soil embankment of section K128+900～K129+400 of DS Expressway in southwest mountainous area as an example,this paper studies the failure mechanism,instability causes and deformation characteristics of expressway soft soil embankment before and after treatment by means of numerical simulation,and combines the limit equilibrium theory to the embankment entry of expressway soft soil foundation.The stability calculation is carried out to evaluate the embankment stability of soft soil foundation of expressway.In view of the incomplete development of consolidation theory,such as consolidation settlement in practical engineering not only occurs after the excess pore water pressure dissipates completely,but also occurs in the process of excess pore water pressure dissipation,that is,consolidation rheology occurs in soft soil foundation resulting in large deformation settlement of embankment.Therefore,according to the rheological point of view,the problem of deformation and aging of soft soil is studied.The settlement process of soft soil is analyzed by rheological model and theory.The relationship between creep and consolidation of soft soil-the unity of creep theory,consolidation theory,creep and consolidation theory of soft soil is further clarified.Deformation and failure of embankment on soft soil foundation of typical Expressway in southwest mountainous area are mostly due to the fact that the soft soil foundation of mounta in slope is not replaced or consolidated during embankment construction,and embankment is filled directly,and the layered rolling and slope protection retaining wall are adopted.Due to the influence of long consolidation time,high groundwater level and traffic load on the soft soil foundation of high fill embankment,there are many penetrating cracks and sliding instability in the side slope,drainage ditch and outer slope of the embankment hill on the soft soil foundation of expressway,among which the shoulder slope retaining wall and drainage ditch are all subjected to different degrees of deformation and damage during the trial operation of expressway.After the battalion,the degree of embankment deformation and failure has further aggravated the development trend.Therefore,the deformation and failure mechanism of embankment on soft soil foundation of expressway is analyzed by numerical simulation method.Combining with engineering examples,reasonable constitutive relation of soft soil is selected,continuous medium deformation equation and finite element model are established,and the phenomenon and mechanism of deformation and failure of embankment on soft soil foundation are revealed by numerical analysis.Aiming at the analysis of deformation and failure mechanism of embankment on soft soil foundation relying on engineering,the embankment synthesis of soft soil foundation is carried out on the basis of researching reasonable methods of embankment treatment on soft soil foundation.In the design of combined treatment project,the rationality of embankment treatment on soft soil foundation is analyzed by numerical simulation.At the same time,the effectiveness of embankment treatment project is revealed through the comparative analysis of deformation monitoring of embankment treatment effect on soft soil foundation which lays a foundation for embankment treatment and effect evaluation of expressway soft soil foundation.This paper carries out the numerical simulation research on the stability of soft soil embankment of Expressway in mountainous area,and the results of embankment treatment and effect evaluation of expressway soft soil foundation It is eager to provide reference for similar projects. |
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