... ABSTRACT ABSTRACT: Although tensile strength can often be neglected for weak or highly jointed rock masses, the strength of rock bridges in moderately fractured and blocky hard rock masses contributes significantly to their self-supporting capacity and should be considered in engineering...

... ABSTRACT ABSTRACT: The application of Geological Strength Index (GSI) to Japanese rocks is discussed. There have been very few attempts at using the GSI in Japan. First, we tried to compare GSI to the Japanese conventional classification for NATM tunneling. The support requirement...

... drilling ve- locities are obtained because of the favourable schist orientation. Drilling is controlled by the shear strength of the foliated rock material. This causes large sized chips and a maximum drilling perfor- mance. If the drilling axis is oriented parallel to foliation, compression also...

... degrees of cementation the peak strength is closely correlated with the Young’s modulus. There seems to be a strong correlation between porosity and strength. This correlation was further improved by taking into account the primary layering. Sonic travel times also correlate with the peak strength and can...

... ABSTRACT ABSTRACT: This paper introduces a new in-situ technique for characterizing rock mass mechanical strength and the associated spatial distribution in the ground. The technique involves automatic drilling process monitoring (DPM). Case examples are given to show the original DPM data...

... known that the creation of an underground excavation disturbs the stress field. When the stress magnitudes on the boundary of the excavation exceed the rock mass strength yielding occurs and an excavation damage zone (EDZ) can be readily observed (Martin et al. 1997). However, in many situations...

...1 INTRODUCTION 1.1 Damage initiation and hard rock strength This paper deals with hard rock (including but not limited to granitoids, gneisses, quartzites and non- foliated mafics) of high rockmass quality (as defined for example by the GSI system of Hoek & Marinos (2000), as shown in Figure 1...

... real time system Upstream Oil & Gas variation Reservoir Characterization damage development specimen triaxial compression rock mass reservoir geomechanics strength initiation brittle material compression flaw pressurized water hydraulic fracturing fracture process hydraulic...

...). For this purpose, six parameters of rock mass, including texture and grain size, hardness, uniaxial compressive strength (UCS), joint spacing, joint filling (aperture) and joint dip, have been investigated by physical modelling and rated. In this system, for each rock mass a rating from 7 to 100 is assigned...

... may be described as an active wedge and the support must be designed to stabilize this wedge. Upstream Oil & Gas Piezometer rock cut reservoir geomechanics strength cohesion air transportation displacement site investigation sequence investigation rock excavation Reservoir...

... con- straints. The influence of scale manifests itself in various ways (e.g. Cunha 1990, 1993b, Bandis 1990, Hud- son & Harrison 1997). Figure 1 presents schemati- cally how the uniaxial compressive strength c of rock media typically varies with size. On Figure 1, the unit bock is defined...

...1 INTRODUCTION Knowledge of the rock mass strength and deforma- tion behavior is required for the design of many en- gineering structures in or on rock, such as founda- tions, slopes, tunnels, underground caverns, drifts, and mining stopes. A better understanding of the rock mass strength behavior...

... (or in-plane shearing mode) and Mode III (or out-of-plane shearing mode). reservoir geomechanics strength Loading Rate experimental result Upstream Oil & Gas flagstaff sandstone short beam compression test hydraulic fracturing microcrack specimen Reservoir Characterization intensity...

... that the rate of deformation influences the peak strength, volume variation and post-peak behaviour of kink bands. The model’s peak strength is influenced by the rate of deformation. An increase of the deformation rate leads to an increase up to five times the peak strength. Slow rates show a consistent...

... Upstream Oil & Gas mass behavior synthetic rock mass discrete fracture network synthetic rock mass model strength cohesion increment fracture lift 2 reservoir geomechanics particle rock mass strength brittleness fragmentation Reservoir Characterization Simulation SRM sample...

...1 INTRODUCTION Analysis of a rock slope typically requires an evalu- ation of the rock structure, an assessment of the mode of failure and the strength of the material. Once a critical failure mode is determined, both con- tinuum or discontinuum analyses can be readily ap- plied and the analyses...

...1 INTRODUCTION Rock contains both matrix material and void space. The amount of void space in rock has a considerable influence on its engineering properties. Specifically, an increase in porosity generally decreases the com- pressive strength and the elastic modulus of rock (Howarth 1987, Martin...

... Artificial Intelligence data model business rule information management workflow relational database data quality drillhole strength Microsoft access geotechnical data management database metals & mining Upstream Oil & Gas geotechnical parameter logger data collection...

...1 INTRODUCTION Research into factors influencing unconfined com- pressive strength (UCS) tests have been conducted at the University of Saskatchewan for over 10 years. Early testing was conducted to look at crack initia- tion and propagation in granitic samples (Eberhardt 1998). Subsequent creep...

... knowledge management strength slope failure interslice boundary rock mass sensitivity analysis Upstream Oil & Gas discontinuity safety factor inclination dip slope Reservoir Characterization stability analysis bedding slip surface shear strength metals & mining mechanism...