Session Start Date

6-1-1988

Abstract

Flood embankments are extensively used in the lower Meuse-Rhine delta to contain the rivers & to protect the towns & the polders below mean sea level. Stability of these embankments is by their nature crucially important & has to be considered under a variety of conditions, from their staged construction or strengthening to their long term behaviour. ln 1984 the landside slope of such a recently heightened & enlarged embankments constructed on a weak post-glacial peat & clay deposit, failed over a length of about 100 m causing the demolition of 4 houses & necessitating extensive stabilization works. A precise analysis of the excess pore pressure monitored at its toe from the start of execution revealed inexplicably high pore pressures, which had been induced during a previous loading phase about 1 year before the failure. The measured increase of pore pressure was 2-3 times greater than indicated by elastic calculations. Stability analyses according to Bishop's simplified method could not give a satisfactory explanation for the failure. An extensive investigation on the causes of their failure has been carried out. The results of a back calculation of the induction & dissipation of the excess pore pressure using non-linear material models implemented in FEM codes will be compared with a classical approach, based on Bishop's circular slip method and linear elastic material models.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Second Conference

Publisher

University of Missouri--Rolla

Publication Date

6-1-1988

Document Version

Final Version

Rights

© 1988 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Evaluation of the Failure of an Important Dike in The Netherlands

Flood embankments are extensively used in the lower Meuse-Rhine delta to contain the rivers & to protect the towns & the polders below mean sea level. Stability of these embankments is by their nature crucially important & has to be considered under a variety of conditions, from their staged construction or strengthening to their long term behaviour. ln 1984 the landside slope of such a recently heightened & enlarged embankments constructed on a weak post-glacial peat & clay deposit, failed over a length of about 100 m causing the demolition of 4 houses & necessitating extensive stabilization works. A precise analysis of the excess pore pressure monitored at its toe from the start of execution revealed inexplicably high pore pressures, which had been induced during a previous loading phase about 1 year before the failure. The measured increase of pore pressure was 2-3 times greater than indicated by elastic calculations. Stability analyses according to Bishop's simplified method could not give a satisfactory explanation for the failure. An extensive investigation on the causes of their failure has been carried out. The results of a back calculation of the induction & dissipation of the excess pore pressure using non-linear material models implemented in FEM codes will be compared with a classical approach, based on Bishop's circular slip method and linear elastic material models.