Slope stability analysis of St Catherine's Point, Isle of Wight

Orr, Catherine (2014) Slope stability analysis of St Catherine's Point, Isle of Wight. MEng dissertation, University of Portsmouth.

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    Abstract

    St Catherine’s Point, located at the southernmost point of the Isle of Wight, is part of the Undercliff, an area that has been historically known for instability.
    This report used site surveys, soil testing and computer modelling to investigate the instability of St Catherine’s Point. Site surveys showed that movement is ongoing within St Catherine’s Point, revealing the reactivation of mudslides and continuing coastal erosion. Computer modelling showed St Catherine’s Point to be in a state of limiting equilibrium, with a safety factor of 1.029. This safety factor, precariously close to 1, proves the instability of the area. The computer modelling showed the slide to be occurring within a layer known as Sandrock 2B, which had previously been stated as the location of the slip surface.
    The slope was modelled through failure occurring in two different ways; through continuing coastal erosion, or through the failure of the cliff. Computer analyses showed that the slope is more sensitive to the failure of the cliff than to coastal erosion, with significant coastal erosion having no impact on the safety factor, and hence stability, of St Catherine’s Point.

    Item Type: Dissertation
    Departments/Research Groups: Faculty of Technology > School of Civil Engineering and Surveying
    Depositing User: Beth Atkins
    Date Deposited: 16 Jan 2015 14:58
    Last Modified: 28 Jan 2015 12:47
    URI: http://eprints.port.ac.uk/id/eprint/16456

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