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Analysis of Field Performance of Embankments on Soft Clay Deposit with and without pvd-improvement

Analysis of Field Performance of Embankments on Soft Clay De...

作者： SHEN Shui-long~1,CHAI Jin-chun~2 HONG Zhen-shun~3,CAI Feng-xi~1 (1.School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200030,China 2.Institute of Lowland Technology,Saga University,Saga 840-8502,Japan 3.Institute of Geotechnical Engineering,Southeast University,Nanjing 210096,China)

This paper presents a case history of the performance of two full-scale test embankments constructed on soft clay deposit in the eastern coastal region of *** embankment was constructed on natural subsoil and the other was constructed on prefabricated vertical drain(pvd) improved *** thickness of the soft clay deposit without pvd-improvement was 19m and with pvd-improved case was 23 *** pvds were installed to a depth of 19m with spacing of 1.5m in a triangular *** performance of the two embankments was analyzed using the finite element *** following influential factors:①hydraulic conductivity of subsoil in field and②discharge capacity of pvds were investigated *** back-analyzed results for the embankment on natural subsoil showed that the hydraulic conductivity ratio(C) of field to laboratory values is about *** analyse the pvd-improved subsoil,a simple approach using the equivalent vertical hydraulic conductivity of pvd-improved subsoil was *** analytical results show that pvds in creased the bulk vertical hydraulic conductivity of soft subsoil by about 30 times compared to the original nontreated *** discharge capacity of pvds in this field case is 79～100m/a,which is consistent with the findings from laboratory tests and other reported values in literature.

关键词： embankment construction soft subsoil pvd-improvement FEM analysis hydraulic conductivity

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