Complete stress field determination in an inclined borehole at the Olkiluoto site, Finland: Joint inversion of hydraulic and en echelon data
Stress measurements were undertaken in a significantly inclined borehole (denominated OL-KR40) at the Olkiluoto site, Finland, resulting in en echelon fracturing of the borehole wall. The failure to successfully stimulate pre-existing fractures using the HTPF-technique, which was the core in the testing strategy, rendered us to use the information from the en echelon features in order to derive the state of stress. This study indicates that the en echelon features do not support failure by tension, except possibly at shallow depth, as this would imply unrealistic stress gradient at the site. Instead, we demonstrate borehole wall failure by shear. By employing the Coulomb criterion, a probable stress distribution with depth is derived.
D. Ask F. Fontbonne C. Brunet
Vattenfall Power Consultant AB, Lule? Sweden Géo-énergies, Clermont-Ferrand, France Institut de Physique du Globe de Paris, Paris, France
国际会议
The Fifth International Symposium on In-situ Rock Stress(第五届国际岩石应力研讨会)
北京
英文
85-92
2010-08-25（万方平台首次上网日期，不代表论文的发表时间）