Research on the Influence Range of Subgrade Deformation in Vacuum Combined Preloading Treatment
It is important and difficult to deal with the influence range of subgrade deformation by vacuum combined preloading.In the paper,based on a project in Zhuhai Free Trade Zone,the measured deformation data of roadbed in the field of vacuum combined preloading treatment with land and sea soft soil foundation are analyzed.PLAXIS is used for numerical simulation,the measured results are compared with the numerical analysis results,and the relevant different influencing factors are analyzed by the numerical analysis method.The results show that the influence range of subgrade deformation increases with the increase of treatment time.With the increase of the distance from the subgrade,the surface horizontal influence radius decreases.The closer the distance from the treatment line,the more obvious the extrusion effect of deep soft soil,and the more obvious the extrusion effect of deep soft soil when the distance from the treatment line exceeds 15 m.The numerical simulation results are in good agreement with the measured data.The maximum horizontal influence radius of the surface decreases with the increase of the primary fill modulus,increases with the increase of the silt thickness,and increases with the increase of the drainage plate length.The deformation range of the pre-loaded subgrade under vacuum combined load is less than 20 m.
subgrade engineeringsoft soil subgradevacuum combined preloadingsubgrade deformationscope of influencenumerical simulation
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