Stress Measurement by Overcoring at Shallow Depths in a Rock Slope: the Scattering of Input Data and Results |
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| Authors: | C Clément V Merrien-Soukatchoff C Dünner Y Gunzburger |
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| Institution: | (1) LAEGO-INERIS, Nancy-Université, Parc de Saurupt, CS 14234, 54042 Nancy, France;(2) Present address: ANTEA, 1, rue du parc de Brabois, 54500 Vandoeuvre, France;(3) LAEGO, Nancy-Université, Parc de Saurupt, CS 14234, 54042 Nancy, France;(4) Institut National de l’Environnement Industriel et des Risques (INERIS), Parc de Saurupt, CS 14234, 54042 Nancy, France |
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| Abstract: | This paper describes a field experiment of stress measurement using the overcoring method performed in a rock slope, called
Rochers de Valabres (located in France’s Southern Alps Region), a field laboratory site prone to rockfalls. Six measurements were conducted at
shallow depths from the surface, moving deeper along a sub-horizontal borehole. The experiment was conducted in heterogeneous
and anisotropic gneiss, with the overcored rock elastic properties, as evaluated by biaxial and uniaxial tests, being widely
scattered. Since stress calculations are sensitive to all input data uncertainties, strain inversion was, thus, performed
using an experimental device and Monte Carlo simulations. The experimental device allows the assessment of rather broad confidence
intervals for both stress magnitude and orientation. The results indicate that the stress state in the surface area is quite
heterogeneous and may be correlated with topography. The measurements show a nonlinear stress distribution with distance to
the free surface, along with high values of principal stresses, despite the vicinity of the surface. Although influenced by
local topography, orientations of the principal computed stresses are characterized by a high turnover due to local heterogeneities.
The results are roughly in accordance to a 2D finite element model of the site. |
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| Keywords: | Stress Overcoring Rock slope Uncertainty Numerical modeling Experimental device |
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