Abstract

The processes leading to rock slope failures are poorly known as well as the influence of the geological conditions on the rockfall frequency. Terrestrial laser scanner has been used to detect rock falls and determine the rockfall frequencies in different geological conditions. It appears that thinly bedded limestone present rockfall frequencies (for rockfalls bigger than 0.1 m3) more than 10 times higher than massive rocks. The influence of meteorological factors on rockfall occurrence has been studied for a thinly bedded limestone cliff. It appears that rockfalls bigger than 0.01 m3 are more frequent in the periods including freeze-thaw episods. For rockfalls bigger than 0.1 m3, the rockfall frequency is respectively 4 times and 3 times higher during rainfall episodes and freeze-thaw episodes, than during periods without rainfall or freeze-thaw. These results could contribute to a better rockfall hazard assessment and a better knowledge of the processes leading to rockfalls.

1 Introduction

The processes leading to rock slope failures are poorly known as well as the influence of the geological conditions on the rockfall frequency. This study presents rockfall frequency measurements for different geological and climatic conditions, which have been carried out using annual terrestrial laser scanning. Moreover, for one of the investigated cliffs, the dates of the rockfalls have been determined using a continuous photographic survey, allowing studying the influence of meteorological factors on rockfall occurrence.

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