...; relationships using only RQD and/or RMR appear to break down where the rock mass is relatively fracture free, but the intact rock is soft, as is the case for this site. INTRODUCTION Accurately modeling the response of a structure to static or seismic loads is of paramount importance when evaluating critical...

... the rehab work. Geotech drilling and the RMR block model are effective tools used when designing drifts in the mine. Prediction of the rock strengths allows long-term drifts to be placed in harder rock with reduced rates of squeezing. In cases where mining through ground with a low rock mass rating...

... Rock Mass Rating (RMR). These guidelines are intended to aid the engineer in the design of ground support capacity appropriate to the rockmass conditions and intended use of the excavation, thereby improving safety in underground mines. Reservoir Characterization reservoir geomechanics...

... Abstract Underground gold mines in Nevada are exploiting increasingly deeper ore bodies comprised of weak, to very weak rock masses. The Rock Mass Rating (RMR) classification system is widely used at underground gold mines in Nevada and is applicable in fair to good quality rock masses...

.... It includes the use of cemented rock fill and a quick mining sequence to minimize ground exposure time and unraveling ground. ridge joint venture metals & mining rock mass classification sediment turquoise ridge joint venture mineralization shaft station rmr reservoir characterization...

.... In order to determine whether the changes seen actually exist, shear wave velocities were measured in location of known rock characterization. These shear wave velocities were then compared with the Rock Mass Rating (RMR) and previously published correlations between RMR and shear wave velocity...

... briefly present the fundamentals of constitutive laws and point out the function of yield (failure) criteria in their developments. Furthermore, their features and shortcomings are discussed in view of experimental results. relation RMR hoek-brown criterion rock mass Reservoir Characterization...

... performed at 4850 level. In this paper a summary of these studies are presented. The geotechnical information was used for the development of new geomechanical characterization models using Data Mining techniques in the scope of the DUSEL project. Models for RMR, Q and GSI were developed using several...

... by highly altered dacite dikes. The highest grade ore is typically the weakest, and ranges from the Very Poor to Poor rock category, as defined by the rock mass rating (RMR) of Bieniawski (1976). The combination of a low dipping ore body geometry, complex geology, and weak rock requires the undercut drift...

... RMR information prediction evaluation rock mass calculation knowledge error measure strength parameter application transformation 1. INTRODUCTION The evaluation of geomechanical parameters in underground works corresponding to the preliminary stages of design is normally performed based...

... of in situ wavespeed to intact wavespeed as a function of joint spacing. These ratios can serve as a direct measure of rock mass quality. They can also be used to compute in situ modulus. The wavespeed ratio was compared to the Rock Mass Rating 89 (RMR) [2]. The wavespeed ratio appears to offer a direct...

...-known geomechanical classifications based on the RMR system (joint spacing, character of joint surfaces and orientation of joints in relation to the load direction) [4,5,6,7]. The authors of this paper present an evaluation method for rock mass quality on the basis of endoscopic observations. Such tests...

... that there were differences in the rock quality assessment obtained by the two teams. The magnitude of differences was greater for Q values when compared with those of the Q' values. The study also highlights the overall effects of the active stress component in Q-system and the discontinuity orientation in RMR...

... ABSTRACT: Various empirical relationships have been derived between rock mass classifications such as Rock Mass Rating (RMR) and Geological Strength Index (GSI) and the modulus of deformation of rock masses. Experience in New Zealand has indicated that these empirical approaches can...

... three layer system composed of soil, weathered rock and underlying fresh bedrock. The soil and weathered rock layer thickness is adjusted as a function of slope. Layer properties include material bulk density, unconfined compressive strength and Rock Mass Rating (RMR). BACKGROUND Geography and geology...

... ABSTRACT : The Rock Mass Rating (RMR) has been used to estimate rock strength and deformation parameters of shallow rock layers for use in the analysis and design of laterally loaded, rock-socketed foundations. A foundation design model was developed and calibrated with seven full-scale load...

...' knowledge the data supporting this experience has not been published. Upstream Oil & Gas strength correlation rock mass Reservoir Characterization New South Wales RMR block size hock-brown criterion criterion discontinuity validation reservoir geomechanics rock mass field...

... difference at failure and strain as a function, in part, of rock mass classification ratings (i.e. Bieniawski's RMR and Barton, Lien and Lunde's Q). Available failure criterion allows reasonable estimates of the stress difference for intact rock as well as rock mass. However, a suitable failure criterion...