... these jointed specimens results with intact ones: Young's modulus and peak strength decrease with increasing jointing. Residual strength revealed to be the same for intact and jointed specimens. GSI res (obtained when fitting the Generalized Hoek-Brown failure criterion to the residual strength results) shows...

... of confining stress. According to the experiment data and the post-peak form of the Hoek-Brown failure criterion, the relationships between confining stress and strength loss parameter are established. The proposed relationships can be used to reasonably evaluate the post-peak strength degradation and further...

... and shale with thin red sandstone beds). – A sequence of thickly bedded, white quartz sandstone separated by thick mudstone beds. renewable energy isrm international symposium strength weakness system big chamber shear strength structural geology failure criterion model anisotropic...

... anisotropic Lekhnitskii-Amadei solution is used to compute the stresses around the borehole wall. The Mogi-Coulomb failure criterion is used for the strength of the intact rock , and the plane of weakness model is used for the strength of the bedding planes. The model can be used to predict the minimum mud...

... Borehole Stability Analysis in Transversely Isotropic Rock using Anisotropic failure criterion Hanna Kima and Ki-Bok Minb* a Graduate Student, Seoul National University, Seoul, Korea b Assistant Professor, Seoul National University, Seoul, Korea *Corresponding Author s E-mail: kbmin@snu.ac.kr...

... is becoming more and more important due to the rapidly increase of tunneling depth. Understanding both the peak and the post-peak strengths of brittle rock are necessary for the design of deep tunneling. After reviews of various estimation methods, the post- peak form of the Hoek-Brown failure criterion...

... Reservoir Characterization strength hoek-brown failure surface failure surface intermediate principal stress Upstream Oil & Gas Pietruszczak failure criterion rock failure criterion new criterion hoek-brown failure criterion criterion hoek-brown criterion test data equation...

... Evaluation of Mohr-Coulomb Failure Criterion Using Unconfined Compressive Strength Musaed N. J. Al-Awad King Saud University, College of Engineering, Petroleum and Natural Gas Engineering Departent, Riyadh, Saudi Arabia *Corresponding Author s E-mail: malawwad@ksu.edu.sa ABSTRACT Several rock...

... numerical analysis metals & mining Engineering empirical relationship uniaxial compressive strength Reservoir Characterization Upstream Oil & Gas Rock mechanics prediction tunnel circular tunnel reservoir simulation explicit solution failure criterion maximum normalized depth maximum...

... Artificial Intelligence criterion failure criterion Upstream Oil & Gas civil engineering mohr-coulomb criterion Reservoir Characterization hoek-brown failure criterion frictional material plastic dissipation power Theorem ultimate bearing capacity rock mass shallow foundation...

... Reservoir Characterization collapse pressure criteria mohr-coulomb criterion Wellbore Design criterion inscribed drucker-prager criterion prediction Upstream Oil & Gas Lade criterion failure criterion sandstone rock failure criteria critical wellbore pressure well collapse...

... reservoir geomechanics Engineering normal stress original theory Reservoir Characterization Upstream Oil & Gas national technical university plane rock mass wellbore integrity strength failure criterion specimen weakness theory sparsely jointed rock mass Wellbore Design...

..., in common engineering practices application of a failure criterion that can incorporate the three-dimensional stresses has been very rare. The objective of this paper is to determine the effects of the intermediate principal stress on the strength of Maha Sarakham salt. A polyaxial load frame is used...

... Severe side-wall spalling 0.4 Heavy support required 0.5 Possible rock burst conditions For detailed analysis, an approach based on failure criterion of rock mass and factor of safety is applied as given below. 3.4 Rock Mass Failure Criterion The failure criterion for rock mass proposed by Sheorey (1997...

... The generalized Hoek-Brown failure criterion is expressed as [7] for undisturbed rock mass: a s c bmc , 3, 3 , 1 (4) where mb is a reduced value of the material constant mi (summarized for different type of rocks in Table 2) and is given by = 28 100exp GSImbm i (5) s and a are constants...

... ABSTRACT A rational function is proposed as a failure criterion for isotropic, dry and intact rocks to be used in both tensile and compressive regions. The criterion is capable of predicting the triaxial behavior of rock under low confinements satisfying the exact values of uniaxial tensile...

... failure time. By using the Janach's failure criterion we related the standardized strength with the confining pressure. Similarly, we defined a formulation to pass from the normalized failure time to creep failure time. Adopting such concepts we could predict the dispersion of both the time of creep...

...Stability analyses of underground openings using a multiaxial failure criterion with scale effects L.L1, M.AUBERTIN & R SIMON, Ecole polytechnipue de Montreal, Canada ABSTRACT: When large openings are created in rock masses, their stability is typically evaluated by comparing the induced stress...