A quantitative comparison of six rock failure criteria

Benz, Thomas; Schwab, Radu

doi:10.1016/j.ijrmms.2008.01.007

Cited by 110 publications

(40 citation statements)

References 15 publications

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“…Because the stress condition at the borehole wall is true triaxial, a precise prediction of rock strength requires the utilization of true triaxial strength criteria, in which all the three principal stresses are incorporated. Various such failure criteria of rock have been proposed, and their characteristic features have extensively been studied [Colmenares and Zoback, 2002;Benz and Schwab, 2008]. We use the modified Wiebols and Cook criterion [Zhou, 1994] because it was shown to be quite reliable when compared to real rock strength data under generalized stress conditions, which is especially important for rock failure at the borehole wall [Colmenares and Zoback, 2002].…”

Section: Estimation Of Rock Compressive Strengthmentioning

confidence: 99%

In situ stress state in the Nankai accretionary wedge estimated from borehole wall failures

Chang

McNeill

Moore

et al. 2010

Geochem Geophys Geosyst

122

213

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[1] We constrain the orientations and magnitudes of in situ stress tensors using borehole wall failures (borehole breakouts and drilling-induced tensile fractures) detected in four vertical boreholes (C0002, C0001, C0004, and C0006 from NW to SE) drilled in the Nankai accretionary wedge. The directions of the maximum horizontal principal stress (S Hmax ), indicated by the azimuths of borehole wall failures, are consistent in individual holes, but those in C0002 (margin-parallel S Hmax ) are nearly perpendicular to those in all other holes (margin-normal S Hmax ). Constrained stress magnitudes in C0001 and C0002, using logged breakout widths combined with empirical rock strength derived from sonic velocity, as well as the presence of the drilling-induced tensile fractures, suggest that the stress state in the shallow portion of the wedge (fore-arc basin and slope sediment formations) is predominantly in favor of normal faulting and that the stress state in the deeper accretionary prism is in favor of probable strike-slip faulting or possible reverse faulting. Thus, the stress regime appears to be divided with depth by the major geological boundaries such as unconformities or thrust faults. The margin-perpendicular tectonic stress components in the two adjacent sites, C0001 and C0002, are different, suggesting that tectonic force driven by the plate pushing of the Philippine Sea plate does not uniformly propagate. Rather, the stress field is inferred to be influenced by additional factors such as local deformation caused by gravitation-driven extension in the fore arc and thrusting and bending within individual geologic domains.

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Section: Estimation Of Rock Compressive Strengthmentioning

confidence: 99%

In situ stress state in the Nankai accretionary wedge estimated from borehole wall failures

Chang

McNeill

Moore

et al. 2010

Geochem Geophys Geosyst

122

213

View full text Add to dashboard Cite

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“…The strength increases with confining pressure, which is a fundamental ingredient of any constitutive law. Many other features could be relevant such as: material (Attewell & Farmer, 1973) anisotropy, load-induced anisotropy (Benz & Schwab, 2008) or creep behaviour (Brantut et al, 2013). However they are not considered in the following.…”

Section: Experimental Reviewmentioning

confidence: 99%

Validation of a New Elastoplastic Constitutive Model Dedicated to the Cyclic Behaviour of Brittle Rock Materials

et al. 2017

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Old mines or caverns may be used as reservoirs for fuel/gas storage or in the context of large scale energy storage. In the first case, oil or gas is stored on annual basis. In the second case pressure due to water or compressed air varies on a daily basis or even faster. In both cases a cyclic loading on the cavern's/mine's walls must be considered for the design. The complexity of rockwork geometries or coupling with water flow requires finite element modelling and then a suitable constitutive law for the rock behaviour modelling. This paper presents and validates the formulation of a new constitutive law able to represent the inherently cyclic behaviour of rocks at low confinement. The main features of the behaviour evidenced by experiments in the literature depict a progressive degradation and strain of the material with the number of cycles. A constitutive law based on a boundary surface concept is developed. It represents the brittle failure of the material as well as its progressive degradation. Kinematic hardening of the yield surface allows the modelling of cycles. Isotropic softening on the cohesion variable leads to the progressive degradation of the rock strength. A limit surface is introduced and has a lower opening than the bounding surface. This surface describes the peak strength of the material and allows the modelling of a brittle behaviour. In addition a fatigue limit is introduced such that no cohesion degradation occurs if the stress state lies inside this surface. The model is validated against three different rock materials and types of experi-

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“…Other criteria are nonlinearly dependent on the stress: the Hoek-Brown criterion either in 2D [63] or in 3D [64], the Griffith criterion. Benz and Schwab [65], who compare several of these criteria, suggest that an extended Hoek-Brown criterion, which exhibits both features, is a better model. …”

Section: Rock Failure Criterion and Rupture Dynamicsmentioning

confidence: 99%

Induced seismicity in geothermal reservoirs: A review of forecasting approaches

Gaucher

Schoenball

Heidbach

et al. 2015

Renewable and Sustainable Energy Reviews

153

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In order to reach Europe's 2020 and 2050 targets in terms of greenhouse gas emissions, geothermal resources will have to contribute substantially to meeting carbon-free energy needs. However, public opinion may prevent future large-scale application of deep geothermal power plants, because induced seismicity is often perceived as an unsolicited and uncontrollable side effect of geothermal development. In the last decade, significant advances were made in the development of models to forecast induced seismicity, which are either based on catalogues of induced seismicity, on the underlying physical processes, or on a hybrid philosophy. In this paper, we provide a comprehensive overview of the existing approaches applied to geothermal contexts. This overview will outline the advantages and drawbacks of the different approaches, identify the gaps in our understanding, and describe the needs for geothermal observations. Most of the forecasting approaches focus on the stimulation phase of enhanced geothermal systems which are most prone to generate seismic events. Besides the statistical models suited for realtime applications during reservoir stimulation, the physics-based models have the advantage of considering subsurface characteristics and estimating the impact of fluid circulation on the reservoir. Hence, to mitigate induced seismicity during major hydraulic stimulations, application of hybrid methods in a decision support system seems the best available solution. So far, however, little attention has been paid to geochemical effects on the failure process and to production periods. Quantitative modelling of induced seismicity still is a challenging and complex matter. Appropriate resources remain to be invested for the scientific community to continue its research and development efforts to successfully forecast induced seismicity in geothermal fields. This is a prerequisite for making this renewable energy resource sustainable and accessible worldwide.

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A quantitative comparison of six rock failure criteria

Cited by 110 publications

References 15 publications

In situ stress state in the Nankai accretionary wedge estimated from borehole wall failures

In situ stress state in the Nankai accretionary wedge estimated from borehole wall failures

Validation of a New Elastoplastic Constitutive Model Dedicated to the Cyclic Behaviour of Brittle Rock Materials

Induced seismicity in geothermal reservoirs: A review of forecasting approaches

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