Complete stress determination with the HTPF tool in a mountainous region

Cornet, François; Wileveau, Y.; Bert, B.; D'Arcy, J.C.

doi:10.1016/s1365-1609(97)00274-8

Cited by 7 publications

(7 citation statements)

References 6 publications

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“…(1) Cornet et al . [], 40 km south of Ubaye area; (2) Cornet and Burlet [], various areas in France; (3) Zoback and Healy [] at Cajon Pass (California); (4) Evans [] at Soultz‐sous‐Forêts (France); and (5) Brudy et al . [] at KTB (Germany).…”

Section: Imaging Overpressurized Areasmentioning

confidence: 99%

“…The intermediate principal stress σ 2 = σv is taken equal to the lithostatic load, and the maximal horizontal stress SH is computed from Sh, σv, and the stress shape ratio Φ. (1)Cornet et al [1997], 40 km south of Ubaye area; (2)Cornet and Burlet [1992], various areas in France; (3)Zoback and Healy [1992] at Cajon Pass (California); (4)Evans [2005] at Soultz-sous-Forêts (France); and (5)Brudy et al [1997] at KTB (Germany).…”

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confidence: 99%

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Tracking fluid pressure buildup from focal mechanisms during the 2003–2004 Ubaye seismic swarm, France

Leclère

Daniel²,

Fabbri

et al. 2013

JGR Solid Earth

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Based on a Mohr-Coulomb analysis, these comparisons provide estimates of fluid pressures along seismic fault planes. We show that the fluid overpressures required to reactivate the cohesionless fault planes vary through time, with values close to 35 MPa at the inception of the swarm. Overpressures then increase up to 55 MPa during the burst of seismic activity and lastly decrease down to 20 MPa at the end of the crisis. We also show that the fluid overpressures are developed as patches along two parallel faults bordering a releasing bend structure characterized by low to null overpressure. The development of moderate fluid overpressure at the swarm inception enables the reactivation of normal, transtensional, and strike-slip faults while the development of larger fluid overpressures during the burst of seismic activity progressively enables the reactivation of further misoriented normal, transtensional, and transpressional faults. In order to reconcile the spatial and temporal evolution of the fluid overpressures and the seismic activity, we propose that creep compaction could be the process allowing the successive development of fluid overpressure and the migration of seismicity.

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Section: Imaging Overpressurized Areasmentioning

confidence: 99%

mentioning

confidence: 99%

Tracking fluid pressure buildup from focal mechanisms during the 2003–2004 Ubaye seismic swarm, France

Leclère

Daniel²,

Fabbri

et al. 2013

JGR Solid Earth

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“…where n is the normal to the fracture plane [2,6,19,20]. In general, P n is interpreted to be equivalent to the shut-in pressure P s , in that both are assumed to be equal to the normal pressure acting on the fracture plane.…”

Section: Governing Equations In 3-d Stress Analysismentioning

confidence: 99%

“…Three-dimensional stress measurement using hydraulic fracturing (HF) was suggested in the late 1980s [17,18] and has advanced with the integration of HF and HTPF, though mostly in vertical boreholes [19][20][21][22]. Three-dimensional stress measurement using arbitrary inclined boreholes has also been studied, in theory and in laboratory scale tests [17,23], as well as in the field [18,24].…”

Section: Introductionmentioning

confidence: 99%

Integrated 3-D stress determination by hydraulic fracturing in multiple inclined boreholes beneath an underground cavern

Synn

Park

Jung

et al. 2015

International Journal of Rock Mechanics and Mining Sciences

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This paper presents a complete three-dimensional stress determination using hydraulic fracturing data from three inclined boreholes, drilled from the floor of an underground cavern at a depth of about 100 m. Both conventional hydraulic fracturing (HF) and hydraulic testing of pre-existing fractures (HTPF) were carried out at all test points to acquire reliable data and conduct the integrated stress

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“…Realistic 3‐D topography models were studied with and without in situ tectonic stresses. In the La Clapiere slope case, using the ‘Hydraulic Tests on Pre‐existing Fractures’ method (Cornet et al ., ), we calculated a horizontal to vertical ratio of 0.686. To consider different stress orientations, we extended this to σ 1 > 0.686.σ 2 = 0.686.σ 3 (with σ 1 = σ xx or σ yy or σ zz depending on the case).…”

Section: Numerical Modellingmentioning

confidence: 99%

Influence of inherited topography on gravitational slope failure: three‐dimensional numerical modelling of the La Clapière slope, Alpes‐Maritimes, France

2014

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Gravitational slope failure involves rock slopes at various scales. Nowadays, it is accepted that different factors influence slope destabilization, including topography. In many cases, slope failure occurs between tributary valleys cutting the slope. In this study, we ask what influence tributary valleys have on slope failure. To tackle this question, we developed a 3‐D numerical model of the La Clapière Slope and then examined a series of simplified 3‐D models with different geometries of tributary valleys (spacing and depth). Our results show that: (1) whatever considered in situ stresses are, including the third dimension reduces the destabilization threshold compared with 2‐D models; and (2) the spacing and the depth of tributary valleys influence slope failure. For shallow incisions, increasing the lateral spacing between tributary valleys does not affect failure localization but does increase slope damage (to a stable value from 2000 m). However, deeper incision does not affect slope damage but does contribute to failure localization. When the spacing is less than 1500 m, the part of the slope between tributary valleys is not involved in the failure process, but for spacings above 1500 m slope failure occurs between tributary valleys.

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Complete stress determination with the HTPF tool in a mountainous region

Cited by 7 publications

References 6 publications

Tracking fluid pressure buildup from focal mechanisms during the 2003–2004 Ubaye seismic swarm, France

Tracking fluid pressure buildup from focal mechanisms during the 2003–2004 Ubaye seismic swarm, France

Integrated 3-D stress determination by hydraulic fracturing in multiple inclined boreholes beneath an underground cavern

Influence of inherited topography on gravitational slope failure: three‐dimensional numerical modelling of the La Clapière slope, Alpes‐Maritimes, France

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