... a NX triaxial Hoek cell. Confining pressure (s 3 ) ranged from 5 MPa to 70 MPa. The brittle-ductile transition pressure was found to be between 20 and 35 MPa for marble and between 55 and 70 MPa for limestone. The lower boundary of this range was approximately equal to one third of the unconfined...

... is not possible with single stage tests and represents an advantage of using automated multistage testing. The test results are then used to investigate the scope for optimization of the Hoek-Brown failure envelope at low confinement commensurate with open pits. In addition, the results are used to investigate...

... ABSTRACT: Hoek & Brown (HB) failure criteria have been employed over the past decades in common engineering applications due to their extended capability to capture the non-linear yielding of different types of rocks. Often implemented within a perfect plastic framework, this constitutive...

... table to characterize the Miami Limestone. Based on the Hoek-Brown Criterion, the GSI values are used to determine the global shear strength of the rock mass to evaluate potential punching failure of shallow foundation for bridges through the Miami Limestone. Additionally, statistical information about...

... new harbour group machine learning Artificial Intelligence strength mass classification scheme application Reservoir Characterization hydraulic fracturing input parameter geologist fracture Hoek bedrock rock mass classification scheme classification scheme 1. INTRODUCTION This paper...

... Abstract: The Hoek-Brown empirical strength criterion for intact rock is widely used as the basis for estimating the strength of rock masses. Estimates of the H-B parameters, the empirical constant m and the uniaxial compressive strength s c are commonly obtained by fitting the criterion...

...1. INTRODUCTION The original Hoek-Brown failure criterion [1] was defined in terms of major and minor total stresses as follows: 5.0 3 31 sm ci ci where the relationship between the principal stresses ( 1 and 3) at failure is defined by two constants, (m and s), and the uniaxial compressive...

...1. INTRODUCTION The effect of sample size on the behavior of quasi- brittle and brittle materials such as rock has been studied by a number of authors [2, 3, 4, 5, 6]. Hoek and Brown [1] provided an empirical size effect model that is often cited. This relationship is similar in format...

... between the stress tensor and the strength of a rock mass determines how to understand and to utilize the in-situ stress measurements. Since the 1980s, various methods of estimating the strength of rock mass have been put forward. Among these methods, the Hoek-Brown Criterion and its related method...

... ABSTRACT The intact rock constant, mi, is one of the three basic input parameters required for the widely used Hoek-Brown failure criterion. In the absence of laboratory testing, guideline charts with mi values based on rock type have been provided by Hoek & Brown and others. Our...

... on non-linear curve envelopes using Hoek-Brown Strength Criterion. These values were then converted to a unique set of linear Mohr-Coulomb strengths using the general Hoek-Brown equations and checked by the computer program RocLab by RocScience; and used in the design of each soil nail wall. Intact rock...

... structural geology stability diagram Upstream Oil & Gas convergence Reservoir Characterization argillite southern california mountain metasandstone tunnel lithology rock mass santiago peak Goel investigation pebbly mudstone Hoek tunnel corridor ICE tunnel California 1...

... metamorphic rock foliated rock mass metamorphic rock mass characterization classification gsi table rock mass reservoir geomechanics correlation Reservoir Characterization geological strength index GSI phyllite discontinuity tunnel foliated rock Venezuela Hoek 1. INTRODUCTION...

... overestimate the deformability of massive weak rocks and underestimate that of strong closely-jointed rocks. This paper reviews empirical methods from over the past 40 years, including that in the recent Hoek and Diederichs paper, and compares the predictions with data from two New Zealand case studies...

... ABSTRACT: The assessment of strength of rock masses is a key element for the analysis of many rock excavations, both open pit and underground. There are attempts to assess the rock mass strength using Rock Mass Classification, the most popular one relates the Hoek-Brown Failure Criteria...

... in which the intermediate stress does not affect failure, the Mohr-Coulomb and Hoek & Brown criteria fit the test data equally well, or even better, than the more-complicated polyaxial criteria. 1 INTRODUCTION A number of different criteria have been proposed to describe brittle rock failure. We...

... layer exploration Bieniawski transmission line foundation Hoek rock mass full-scale load test Laterally Rock mass Rating RMR geotechnical exploration deformation parameter foundation Rock Mechamcs /n the National Interest, Elsworth, T/nucc/ & Heasley (eds), ¸2001 Swets & Ze/tl/nger L/sse...