Session Start Date

5-6-1984

Abstract

A mature clay flood bank was subjected to seepage and overtopping tests. Tides were simulated by pumping water into a sheet pile coffer dam enclosing the river ward side of a 18 m length of bank. Measurements were made of the seepage, the pore water pressure in the bank, and movements of the bank. Tides of increasing height were applied until finally the water started to flow over the top of the bank. Within a few minutes of the commencement of shallow overtopping a slip developed in the desiccated clay within the landward slope of the bank. This was rapidly followed by vertical slices being pushed off the crest and the development of a 0.76 m deep breach within a few minutes. Stability analyses incorporating strengths measured by large in-situ shear tests on the saturated fissured clay gave factors of safety close to unity when the three dimensional form of the slipped mass was taken into account.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

First Conference

Publisher

University of Missouri--Rolla

Publication Date

5-6-1984

Document Version

Final Version

Rights

© 1984 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 6th, 12:00 AM

Controlled Breaching of a Full Scale Clay Flood Bank

A mature clay flood bank was subjected to seepage and overtopping tests. Tides were simulated by pumping water into a sheet pile coffer dam enclosing the river ward side of a 18 m length of bank. Measurements were made of the seepage, the pore water pressure in the bank, and movements of the bank. Tides of increasing height were applied until finally the water started to flow over the top of the bank. Within a few minutes of the commencement of shallow overtopping a slip developed in the desiccated clay within the landward slope of the bank. This was rapidly followed by vertical slices being pushed off the crest and the development of a 0.76 m deep breach within a few minutes. Stability analyses incorporating strengths measured by large in-situ shear tests on the saturated fissured clay gave factors of safety close to unity when the three dimensional form of the slipped mass was taken into account.