Prediction program for slow moving landslides

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Publication Title
Prediction program for slow moving landslides

Abstract
The deformation behaviour of large, slow moving landslides is often governed by rainfall characteristics. Whereas the average deformation rate per year of such landslides is often in the range of some mm to several cm, permanent deformation measurements for instance by means of permanently installed chain inclinometers show a far wider range of deformation rates especially after dry or very wet periods. If in addition to chain inclinometers, a weather station and permanent measured pore water gauges in the slip zone are installed one can identify in many cases a strong correlation between strong rain fall events, a time-delayed increase of the pore water pressure in the slip zone and simultaneously to this, an increase of the deformation rate of the landslide. So, based on these data, a good understanding of the above- mentioned correlation can be obtained. In this paper a newly developed analytical model which couples the relation between rainfall characteristics and the development of pore water pressures in the slip zone on one hand and the deformation behaviour of the slope on the other will be presented. The code allows a partition of the landslide in different sections to consider the often-observed time delayed deformation behaviour over the length of large landslides. The interrelation of shear resistance in the slip surface and deformation rate is defined by a logarithmic constitutive law. The calibration of the model is done by means of the above-mentioned permanent measurement data of precipitation, pore water pressures and deformation measurements.
Authors
Roman Marte; H. Ramoser

Published In

18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)

Theme

B - Geohazards

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