Article | REF: C254 V2

Slope stability - Landslides on soft ground

Author: Philippe REIFFSTECK

Publication date: November 10, 2015

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2. Site reconnaissance

2.1 Geology and geomorphology

Some geological formations are renowned for their frequently unstable slopes:

  • Lias black marls in Lorraine, Burgundy and Aveyron;

  • Gault clays in Normandy ;

  • Varved quaternary clays south of Grenoble, etc.

The first step in a slope stability study is to establish the geological structure of the site: nature of the bedrock, thickness of surface formations, presence of faults, etc. It is important that the geological study extends over a wider area than the precise location of the unstable zone. It is important that the geological study extends over a wider area than the precise location of the unstable zone....

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