Interpretation of in situ stress measurements in anisotropic rocks with the doorstopper method

Autor:	S. Martinetti, R. Ribacchi, M. Borsetto
Rok vydání:	1984
Předmět:	Engineering business.industry Isotropy Borehole Mineralogy Drilling Geology In situ stress Geotechnical Engineering and Engineering Geology Interpretation (model theory) Anisotropy business Civil and Structural Engineering Gneiss Stress concentration
Zdroj:	Rock Mechanics and Rock Engineering. 17:167-182
ISSN:	1434-453X 0723-2632
DOI:	10.1007/bf01042548
Popis:	A correct interpretation of in situ stress measurements by means of the doorstopper technique in cross anisotropic rocks requires that 10 stress concentration factors at the bottom of the borehole be known instead of the 3 which are needed for isotropic rocks. In order to analyse the data obtained in a site investigation in a gneiss of the Alpine region, these factors were determined by a three-dimensional high-order finite-element model. The results are presented and compared with those obtained by means of first approximation methods. The feasibility of carrying out measurements in anisotropic rock by means of only 2 boreholes is discussed and it is shown that in practice 3 properly oriented boreholes are needed in this case too.
Databáze:	OpenAIRE
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