... of rock mass evaluated. The results showed a triangular disturbance zone with respect to the surface for good and regular quality rock masses; however, for poor rock mass quality the disturbance zone was observed to be rectangular. The behavior of the strength properties and the Hoek & Brown envelope...

... during the feasibility studies are useful for providing information on the rock mass quality along the potential tunnel alignment and for visualization of the existing sub-surface geological conditions. This paper describes the various studies performed along proposed tunnel alignments in the Himalayas...

.... The various underground elements of the project are described by Clark et al. (2015). excavation istanbul strait design parameter reservoir characterization sandstone deep excavation structural geology rock mass quality transition box displacement upstream oil & gas subsurface profile...

... than in rock masses under low stresses. However, this may also be due to better rock mass quality where the higher stress occurs. In addition, different equipment and techniques used to arrive at the design modulus value of rock masses give often different results due to different procedures...

... quality has a great influence on the shaft resistance, however the mechanisms and details of such influence are poorly understood since the rock mass quality is usually not defined during these load test programs. This paper presents a laboratory attempt to study the influence of two significant rock mass...

... and unfaulted ground until the excavation heading was fully embedded in the fault itself. However, depending upon the nature of the host rock adjacent to the fault, this transition from unfaulted to faulted ground may contain gradually degrading rock mass quality or it could contain abrupt changes in rock...

...1. INTRODUCTION Measures of rock mass quality are both essential and elusive. This field study investigates the inter- relationships among relevant rock mechanics quantities, including traditional quality metrics such as Rock Quality Designation (RQD), Rock Mass Rating 89 (RMR), and seismic...

... ABSTRACT: The experiences in evaluating the rock mass quality with the help of Endoscopic Rock Mass Factor (ERMF) are described. ERMF was worked out by the authors and research was carried out in the Polish underground coal mines. ERMF enables the quantitative and qualitative estimation...

... to consider both material and labour but also costs associated with delays in production. Such delays can have significant monetary consequences. It is an accepted fact that ore pass longevity depends largely on such design factors as rock mass quality, ratio of field stress to rock mass strength and support...

..., fair, good, or excellent. Table 1 provides the general definitions for strength and rock quality as applied in this procedure. The strength classification is modified from Bieniawski [1] and the Rock Quality Designation (RQD) of Deere [2] is used to define the initial rock mass quality. The quality...

... underground mining was conducted in the West Generator Mine, developed from the bottom of the West Generator Pit, in a small deposit whose extraction would require an uneconomic lay-back of the existing pit wall. Rock mass quality at West Generator allowed the use of a sublevel stoping mining method...

...-squeezing, and the squeezing ground conditions. correlation tunnel section excavation Singh rock mass quality Barton ground condition design chart support system rock mass number Reservoir Characterization empirical approach consideration rock mass tunnel strength tunnel depth non...

... of relative abrasivity using the Cercharscratch abrasivity test provides a basis for the assessment of tool consumption. This can be modified by also considering the effects of the machine specification and the rock mass quality. INTRODUCTION The main object of this paper is to review, and suggest how tool...

... data relating to past national mine slope instability cases. It is an on-going project and currently holds 120 case histories. The influence exerted by slope geometry, structure and rock mass quality on mine slope stability is examined with reference to both projects. Groundwater is recognised...

... ESTIMATION DES SOUTENMENTS NÉCESSAIRES POUR LES EXCAVATIONS SOUTERRAINES ABSCHÄTZUNG DES NÖTIGEN FELSAUSBAUES IM HOHLRAMBAU An analysis of some 200 case records has revealed a useful correlation between the amount and type of permanent support and the rock mass quality Q, with respect...

.... The exploratory methods which could be used in this approach are field seismic surveys, laboratory tests on intact cores, field pumping tests, borehole camera studies, and various core logging techniques which give an indication of rock mass quality in terms of fracture frequency, weather- ing, etc...