... Abstract A fundamental component of the Hoek–Brown empirical rock failure criterion is assessing an appropriate mi constant. In developing their empirical criterion Hoek and Brown normalised triaxial test results by dividing the principal stresses at failure by the uniaxial compressive...

... EFFECT IN FRACTURE TOUGHNESS OF SANDSTONE M. Kataoka, Y. Obara 4 TEST RESULTS An example of a fractured specimen after the test is shown in Figure 5. It can be confirmed that the fracture propagated from the tip of the artificial notch to the upper loading point. Examples of load-displacement curves...

... test result Reservoir Characterization displacement Development Trend support device rebar bolt reservoir geomechanics rockbolt Anchor rock mass Upstream Oil & Gas rock support deformation capacity premature failure dynamic test result external support device support system rock...

... of a material or product property, according to the Eurocode it is a "value obtained by dividing the characteristic value by a partial factor". Reservoir Characterization regression criteria reservoir geomechanics strength triaxial test result test result Muralha triaxial test machine learning...

... can provide additional benefits to the skin support. deflection polymer skin spray-on liner loading steel mesh diameter metals & mining bearing capacity skin support puncture test steel disc strength test result steel plate polymer skin polymer sheet polymer TSL strata...

... ABSTRACT We conducted a centrifuge model test on earthquake-induced rock slope failure. The test results were compared with Safety Factors (SFs) related to the sliding surface, obtained by the limit equilibrium method; the stresses on the sliding surface were estimated by equivalent linear...

... Barton test result cn condition initial normal stress peak friction coefficient specimen friction coefficient normal displacement stiffness Harmonising Rock Engineering and the Environment Qian & Zhou (eds) © 2012 Taylor & Francis Group, London, ISBN 978-0-415-80444-8 Shear behavior model...

... rock mass strength fracture propagation Upstream Oil & Gas experiment numerical anisotropic fracture mechanics fracture friction angle reservoir geomechanics strength fracture initiation shear stress Olkiluoto hydraulic fracturing propagation initiation test result Posiva...

... the stress level reaches approximately c/2 in both directions. An empirical biaxial failure is derived from a regression analysis of test results, and a new biaxial failure criterion for the jointed rockmass is proposed in an analogous way to the Hoek-Brown criterion, based on the test result and combining...

... methods (i.e. ISRM 1981) specify the requirements of test samples. For example, ISRM(1981) suggests that the height to diameter ratio of core samples should be between 2.5 and 3 for appropriate test results. But this ratio cannot always be obtained particularly from weak, stratified (thinly bedded...

... ABSTRACT Standard methods to determine fracture toughness which is one of the important factors in rock mechanics were suggested in 1988 and 1995 by the commission on testing methods of ISRM. It is difficult to verify lab test because of the wide variation of test results and difficulty...

... tests is the importance of the intermediate principal stress in the failure strength of rocks. Taking this idea into account, the Hoek-Brown failure criterion is modified. The laboratory test results are modelled with this new criterion with great success, which proves the goodness of the modification...

... Reservoir Characterization strength intercept test result reservoir geomechanics Barton NRP MPa anisotropic rock joint new peak shear strength criteria shear test anisotropy JRC peak shear strength shear strength equation 11th Congress of the International Society for Rock Mechanics...

..., and none in the last decade. This paper presents the results of a testing program on a granite rock type. Biaxial testing, conducted on 100 mm cubic samples, was carried out to examine the influence of lateral confinement and loading rate on the rock's ultimate strength. The paper reports the test results...

... flint particle particle specimen MPa strength Rock mechanics test specimen uc value test result point load 3 Cray programme discontinuity investigation preparation flint chalk unconfined compressive strength ABSTRACT Data are presented from two sites in southeast England...

... shear test result hoek-brown gsi criterion Recent studies by the authors into the behaviour of jointed rock masses using direct shear testing have confirmed that joint spacing has a significant effect on rock mass strength. The rock mass failure envelopes assessed from these tests have been...

... Upstream Oil & Gas stress state test result Poisson reservoir geomechanics incremental test stability continuous loading test carboniferous slate loading test show consolidation loading test investigation loading stress condition Reservoir Characterization strength specimen...

... sandstone compression test determination Reservoir Characterization approximation specimen investigation high temperature deformation amorphous rock Material Behaviour plane test result granite tiefbohrprogramm der bundesrepublik deutschland Stress-strain behaviour of crYstall,i...

... and Archambault's equation. They compared their results with in situ test results. and found satisfactory correlation. The roughness of the. socket was expressed in terms of equivalent triangular asperities. 4.2 Estimation of pile capacity usingfractal dimension Here the procedure adopted is similar...

... part. reservoir geomechanics breakdown borehole investigation Upstream Oil & Gas hydraulic fracturing transfer tunnel test result Reservoir Characterization orientation correspond lining Chainage diameter minimum stress in-situ stress tunnel excavation low cover tunnel...