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Keywords: fracture
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Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-327
... includes hydraulic fracture and cavity expansion mechanisms. The experimental results indicate the growth of a fracture plane in soil in a very fast manner both in normally and overconsolidated clays. Finite element analyses of compensation grouting have been performed to assess its ability to model...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-365
... design line roughness unconfined compressive strength fracture skin friction value Williams dublin 0 pile socketed structural geology hard rock pile loading test skin friction Kulhawy Reservoir Characterization friction Irish rock adhesion factor Ireland ABSTRACT: Piles...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-444
.... attenuation ae wave wead evaluation AE sensor energy count waveguide ringdown count application Upstream Oil & Gas intermediate stage borehole slope failure fracture Reservoir Characterization reinforcement AE signal characteristic AE activity fracture level Shiotani DETECTION...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-626
.... Based on the theo- ries of gas emission from coal particles and our experimental results, a new model for coal and gas outbursts is proposed, which can give satisfactory explanation to outburst phenomena observed in laboratories and in situ. Moreover, this model clarifies the unique role of fracture...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-527
... ABSTRACT: By using the two-dimensional distinct element method and the code UDEC, this study numerically models the effect of fracture pattern on rock stresses. Three geological fracture pattern models are considered: two parallel fractures, multiple parallel fractures...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-051
...A STUDY OF UDEC MODELING ON EFFECTS OF NONLINEAR DEFORMATIONAL BEHAVIOR OF A FRACTURE ON P-WAVE ATTENUATION J. G. Cai1, J. Zhao2 ABSTRACT Stress waves propagating in fractured rock masses are attenuated (and slowed) due to the reflection and transmission at rock fractures. The deformation...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-033
...FRACTURE SYSTEMS, FRACTURE PROPAGATION AND COALESCENCE Herbert H. Einstein1, Ove Stephansson2 ABSTRACT In the context of "strength of rocks for rock slope design" this paper concentrates on the fact that rock masses are discontinua and, in many cases, have to be modelled as such. The paper...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-124
... ABSTRACT: In order to evaluate the change in the hydraulic conductivity by excavation in a fractured rock mass, the nonlinear elastic model is proposed. The crack tensor theory originally proposed by Oda and the nonlinear elastic model of fracture proposed by Baton and Bandis are combined...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-198
.... The matrix mainly comprise of clay minerals, including illite, kaolinite and chlorite. Among the clay minerals, chlorite is the most soluble in water and easiest to be leached out. Furthermore, when sandstone is wetted, the type of fracture transfers from the trans-granular fracture of dry state to inter...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-073
...COUPLED AIR-WATER FLOW THROUGH FRACTURED SANDSTONES Ranjith, P.G.1 and Indraratna, B.2 ABSTRACT In two-phase flow within a rock mass, where both air and water phases flow together, the accurate flow measurement of each individual phase is important in numerical analyses. The increased quantity...
Proceedings Papers

Paper presented at the ISRM International Symposium, September 10–12, 1990
Paper Number: ISRM-IS-1990-029
... hydraulic fracturing horizontal pressure extension fracture loading Upstream Oil & Gas adams horizontal stress cyclic process reservoir geomechanics fracture mechanics mechanism Gramberg Reservoir Characterization mining fracture s-shaped deformation stope regime stress...
Proceedings Papers

Paper presented at the ISRM International Symposium, September 10–12, 1990
Paper Number: ISRM-IS-1990-003
... Reservoir Characterization AE frequency rock tank site rock specimen real time system acoustic emission characteristic rock mass Downstream Oil & Gas Institute storage cavern granodiorite cavern rock cavern excavation fracture loosening decrease ratio Indicator Static...
Proceedings Papers

Paper presented at the ISRM International Symposium, September 10–12, 1990
Paper Number: ISRM-IS-1990-028
... Static and Dynamic Considerations in Rock Engineering, Brummer (ed.) © 1990 Balkema, Rotterdam. ISBN 90 6191 1532 Stress relief by hydraulic fracturing - Dream or reality? J.-c. Roegiers University of Oklahoma, Norman, Okla., USA K. BenNaceur Dowell Schlumberger, Algiers, Algeria ABSTRACT: The use...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-178
... sections of the upper 2500m, whereas technically induced hydraulic fractures appeared nearly everywhere down to 4000m. Core disking occurred first and abruptly at 3575m, with a change of rock from strongly layered gneiss to weakly texturized amphibolites. 1 INTRODUCTION The Continental Deep Drilling...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-183
... ABSTRACT: The elements of the new theory of quantitative definition of fracturing, the estimation of structural hierarchy of rock massifs based on the spectral and correlation analysis of data of electrometric and nuclear-geophysical logging are set forth. The new method of the borehole...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-169
.... The result of extended investigations identified the event as a fluid-induced tectonic rockburst, consisting of a fluid-induced seismic event in the overburden rock strata, a dynamic destruction of brittle carnallitic pillars in the depth and a very complex fracture interaction process between shear...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-174
... but became stable during the loading process. Secondary extension or shear fractures were observed prior to shear failure. Gay (1976) and Hoek and Brown (1980) have reported results from biaxially loaded samples. The fracture patterns are complex but again tensile cracks were observed during the initial...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-159
... Abstract: A theoretical model of dilatancy and fracture of a brittle rock due to growth of many initial cracks under uniaxial compression is presented, assuming that a group of biggest and most rarely distributed of them is the leading one, and cracks of this group are markedly increased...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-181
... ABSTRACT: Small volume hydraulic fracture tests, herein defined as microfracs, were conducted in order to determine the variation of minimum principal stress with depth at various locations in and adjacent to oil sands formations in Alberta, Canada. Although hydraulic fracturing has become...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-176
... ABSTRACT: Recent developments in the use of imaging techniques (Formation Microscanner and Borehole Televiewer) for fracture evaluation are reviewed. The tool principles and the methodology for fracture characterisation are outlined. Then examples of natural and induced fractures are presented...

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