Effect on Reduction in Secondary Consolidation of Vacuum Preloading Method for Peat Deposit and Its Estimation
Hirochika HAYASHI and Satoshi NISHIMOTO
Abstract:Test embankment work was conducted in peat deposit to clear effect on reduction in secondary consolidation of the vacuum preloading method. The finite element analysis using an elasto-viscoplastic model was also conducted to evaluate the reduced secondary consolidation of peat. The following matters were clarified as a result; 1) Negative pressure, which was applied during pump operation, was unloaded after the stopping of pumps and caused over consolidation of the ground. 2) The relationship between the overconsolidation ratio (OCR ) and the reduction rate of secondary consolidation (R ) describes a form close to a hyperbola curve. 3) Secondary consolidation can be controlled by vacuum preloading, and the amount of settlement can be predicted using the relationship between the OCR and R. Key Words:Vacuum preloading, Peat, Long-term settlement, Coefficient of secondary consolidation, Overconsolidation