Coastal cliff rock mass weakening of chalk and the impact of salt water

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Title: Coastal cliff rock mass weakening of chalk and the impact of salt water
Authors: Lawrence, JA
Spence, R
Mortimore, RN
Eade, M
Bottrell, SH
Item Type: Journal Article
Abstract: The relationship between salt water and the strength of Chalk forming the coastal cliffs of northwest Europe was investigated. Uniaxial compressive strength (UCS) tests on core samples from three horizontal boreholes drilled at the base of Chalk cliffs in East Sussex, UK, showed the weakest Chalk to be near the cliff face. The UCS nearly doubled over the length of the 9 m deep boreholes. The UCS results were close to values expected for Chalk of this intact dry density for samples farthest from the cliff face. High chloride concentrations (salt water) of up to 69 000 mg/l were found to be associated with the lowest UCS values closest to the cliff face. Lower chloride concentrations, with values of 1850 mg/l or less and often with a non-marine origin, were found in the stronger core samples. It can be concluded that the Chalk coastal cliffs in the areas tested became weaker towards the cliff face. This can, in part, be linked to salt water weakening although it is likely that other factors are also contributing to this phenomenon.
Issue Date: 31-Dec-2018
Date of Acceptance: 8-Sep-2018
ISSN: 1353-2618
Publisher: Thomas Telford Ltd.
Start Page: 545
End Page: 555
Journal / Book Title: Proceedings of the Institution of Civil Engineers - Geotechnical Engineering
Volume: 171
Issue: 6
Copyright Statement: © 2018 ICE Publishing. All rights reserved.
Keywords: 0905 Civil Engineering
Publication Status: Published
Online Publication Date: 2018-10-10
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering

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