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| Titel |
An Investigation of Landslide Mechanisms in a Coastal Glacial Till |
| VerfasserIn |
Sasiwimol Nawawitphisit, Dave N. Petley, Nick J. Rosser |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250052492
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| Zusammenfassung |
| This project aims to discuss the techniques employed in investigating the complex
relationship between pore pressure variation and the movement rate and style in landslide
systems. The complex landslide of Upgang beach in Whitby, UK, 500 m in length, is
considered in order to understand how the landslide movement starts and stops in glacial
till with precise data from displacement and piezometer data. More specifically,
terrestrial laser scanning (TLS) has been used monthly to characterize the dynamics of
landsliding, with data captured at 5 cm resolution. Additionally, in situ monitoring, using
extensometers, piezometers and rain gauges, is carried out to explore the dynamic
relationship between displacement and pore water pressure. Firstly, displacements are
observed by the lateral extensometers. Furthermore, groundwater is monitored in six
stand-pipe boreholes, which are installed in different layers within the till in order to
monitor pore water pressure at various representative locations on the cliff slope. In
an attempt to understand the mechanisms that control landslides in response to
pore pressure changes, direct shear box and back pressured shear box are used to
examine the whole evolution of failure responding to variations in stress and strain.
This allows for an understanding of the role of material behavior in controlling
landslide movement patterns. In particular, the shear strength of five layers of tills are
analysed using the direct shear box. This, together with the groundwater data are
then analysed using the back pressured shear box to simulate the field condition of
landslides during the development of failure. It is hoped that a combination of fieldwork
methods and laboratory testing utilised in this project can generate critical discussions
and ultimately lead to a more nuanced understanding of landslide mechanisms. |
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