Influence of topographic roughness on the stress state in a sloped rock-mass

Abstract : Although stress states in the ground are seldom well known with precision, such is especially true in slopes where the boundaries and initial conditions as well as topographic variations are difficult to grasp. As with other sites, it proves difficult to replicate the history of the tectonic stages the ground has undergone. The stress state close to the topographic surface is quite heterogeneous and strongly correlated with the topographic fluctuation, i.e. the so-called topographic "roughness". Moreover, stress measurements in slope are also rare, particularly close to the surface. In order to better understand rockfalls, a multidisciplinary study is being conducted on the "Rochers de Valahres" slope (France's Southern Alps region). One component of this study will focus on both stress and stress variation measurements. To appropriately design this experiment, computations of the influence of "topographic roughness" on the stress state have been undertaken. This paper will describe the primary results derived from this purely-computational step of the analysis. The influence of topographical variation could initially be shown from simple computations on the steady roughness. To evaluate stresses caused by the entire slope, it becomes necessary to seek a position under a "limit plane", located beneath the topographic roughness. Several 2D cross-sections generated from a 3D Digital Elevation Models (DEM) of the site have allowed estimating a topographic roughness on the order of +/- 10 m around the average plane. The limitations inherent in this analysis (213, cross-correlation not taken into account, etc.) will be discussed herein, along with as a comparison of steady roughness and an actual cross-section of the topography.
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Conference papers
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  • HAL Id : ineris-00970073, version 1
  • INERIS : EN-2006-089

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Véronique Merrien-Soukatchoff, Judith Sausse, Clémence Dunner. Influence of topographic roughness on the stress state in a sloped rock-mass. International symposium of the international society for rock mechanics (EUROCK 2006), May 2006, Liège, Belgium. pp.473-478. ⟨ineris-00970073⟩

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