... to effectively model shale mechanical properties after interaction with drilling fluid filtrate. In this study shale swelling stresses were integrated into the prominent Mohr-Coulomb failure criterion and therefore a new form of this criterion has been introduced which combined the natural mechanical properties...

..., as Mogi-Coulomb strength criterion can better describe the failure features of rocks under high geostress and rock micro-unit strength obeys the Weibull distribution, a new statistical damage constitutive model is established. Then, comparing the new model based on Mogi-Coulomb criterion with the Drucker...

... & Gas Simulation structural geology criterion rock crack propagation loading fracture reservoir geomechanics node continuous-discontinuous cellular automaton method iteration crack propagation automaton cellular automaton increment propagation freedom compression Rock...

... integrity at each location was evaluated considering two criteria. The first criterion is related to dilatancy of rock salt: the integrity is guaranteed if rock stresses do not exceed the dilatancy boundary. The second criterion is related to fluid pressure: the integrity is guaranteed if the hydrostatic...

... understanding of a mechanism of the fault slip, many efforts have been made (Alber et al. 2011, Castro et al. 2009, Hofmann & Scheepers 2011). Through the research, a relation between the occurrence of fault slip and min- ing activities has been studied. However, the classical Mohr-Coulomb criterion...

... criterion, which neglects the role of σ 2 , predicting only the lower limit of rock strength for a given σ 3 . strength crystalline rock characteristic Upstream Oil & Gas variation specimen compressive strength Coconino sandstone principal stress Reservoir Characterization Triaxial...

..., Li & Low 2010, among others, using elastic-perfectly-plastic model. This paper deals with more complex constitutive model, namely elastic-strain-softening model. Further investigations are conducted in the present study. Artificial Intelligence criterion coefficient Reservoir...

... satisfying the failure criterion and changing to the real joints. 2.2 Determination of initial material parameters In order to reduce the influences of potential joints on simulating continuum before cracks initiation or propagation, the determination of initial joint stiffness is the key. And the other...

... Reservoir Characterization criterion Norwegian criterion lining requirement reservoir geomechanics Power House pressure tunnel investigation excavation design approach selection concrete lining leakage tunnel Upstream Oil & Gas design method in-situ stress steel lining...

... Upstream Oil & Gas criterion rock salt top salt gorleben salt dome calculation Disposal Time Period disposal concept borehole disposal structural geology salt dome Heusermann hydraulic criterion Waste Emplacement Reservoir Characterization overburden salt barrier...

... is analyzed by strength reduction method. But inhomogeneity is the basic characteristics for geotechnical materials. Engineering slope stability analysis safety factor Strength Reduction Method criterion sort judgment inhomogeneous characteristic equation Upstream Oil & Gas material...

... storage displacement gas temperature hydraulic fracturing temperature distribution convection thermal expansion coefficient rapid depressurization cavern tensile closure spring meeting crotogino rock temperature Upstream Oil & Gas criterion thermal stress rock mass fracture onset...

... of two angles describing the orientation of the rock bedding. Bedding has an important effect on the behaviour of such type ofrockssinceitcontrolsbothitsmechanical behaviour (e.g.,highestcompressibilityindirection perpendicular to Upstream Oil & Gas criterion structural geology Reservoir...

... increases significantly with the magnitude of σ 2 , reaching levels of up to 10–100% higher than the peak σ 1 when σ 2 = σ 3 . The true triaxial strength criterion is obtained by plotting all test results in a modified Nadai (1950) domain, in which the data points are best fit by a power function in which...

.... Analyzing the experimental data on the basis of the Mohr-Coulomb failure criterion, the brittle-ductile transition properties under different loading orientations are brought out, and the relevant brittle-ductile transition confining pressure are predicted by failure criterion. The results show...

... element method. Different numerical results between the single-material and bi-materials specimens have also been made. According to the mixed mode fracture theory e.g. the  max criterion, the conditions which estimate when the mixed mode crack in the bi-materials specimens may propagate and whether...

... reservoir geomechanics intensity factor criterion crack surface friction hydraulic fracturing stress intensity factor failure criterion Wellbore Design confirmation specimen rock material Reservoir Characterization Upstream Oil & Gas friction coulomb-mohr criterion zhu...

... with uniform creep behaviour. The modelling results are basic values for the evaluation of the stability of the repository and the long-term integrity of the geological barrier. Concerning the barrier integrity, two geomechanical criteria are considered, the dilatancy criterion and the frac criterion...

...ISRM-Sponsored International Symposium on Rock Mechanics: Rock Characterisation, Modelling and Engineering Design Methods 1 1 INTRODUCTION The non-linear Hoek-Brown (HB) strength criterion is widely employed in numerical analysis for tunnel design, as the failure criterion to simulate...

... ABSTRACT Empirical rock failure criteria generally relates lateral stresses to axial strengths by a particular equation in which uniaxial tensile and/or compressive strengths are to be estimated from the failure criterion by applying the obtained parameters from triaxial datasets...