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Measurement of natural stresses in a Provence mine (Southern France) |
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| Authors: | Patrick Gaviglio Pascal Bigarre Hafid Baroudi Jack-Pierre Piguet Raymond Monteau |
| Affiliation: | a Laboratoire de Géosciences, Université de Franche-Comté, 16 route de Gray, 25030, Besançon cedex, France b Laboratoire de Mécanique des Terrains, INERIS-Ecole des Mines, Parc de Saurupt, 54042, Nancy cedex, France c HBCM Unité d'Exploitation de Provence, BP 1, 13590, Meyreuil, France |
| Abstract: | Stress measurements were carried out in the Arc syncline using drifs in a lignite mine. Eleven sites were investigated using the flat jack and hydraulic fracturing (or stimulating) methods. Two stress states were found to coexist, one isotropic, the other highly anisotropic. The orientations of the principal stresses are not homogeneous and an orientation ranging from E-W to NE-SW predominates locally. This does not accord with the regional stress field. The vertical stresses are systematically underestimated. |
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