Research on Influencing Factors of Settlement and Construction Technology of High Filling Subgrade with Muck
In order to promote the low-carbon development process of the civil engineering industry,tunnel blasting muck is used as highway subgrade filler,and the research on the influencing factors of subgrade settlement and filling technology of high-fill muck are carried out.Relying on the Dejiang-Yuqing Expressway project in Guizhou,a two-dimensional numerical calculation model of high-fill subgrade is established by using MIDAS GTS,the characteristics of subgrade displacement field and stress field under layered filling construction are expounded.The effects of soft foundation replacement depth and layered compaction thickness on subgrade settlement are analyzed,and a muck-filled subgrade settlement control technology is proposed.The results show that the maximum settlement occurs at the bottom of the subgrade during layered filling.With the increase of the filling depth of soft ground,the subgrade settlement gradually decreases.After the filling depth of soft soil foundation exceeds 2.5 m,the effect of reducing the settlement control of the subgrade by increasing the filling depth is not obvious.With the decrease of the layered compaction thickness,the subgrade settlement gradually decreases.The layered tamping thickness is less than 4.5 m,the subgrade settlement control effect decreases significantly.The gradation of fillers for different filling parts of the subgrade is designed by continuous stage formula,and the settlement of the subgrade constructed by layered dislocation strong compaction method meets the requirements of deformation control.
roadbed engineeringfill subgrade with mucksettlement and deformation rulessoft soil replacementfiller gradation designfill compaction
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