... both short and long-term deformation of the clay around the grout and to investigate the fundamental behaviour of the compensation grouting process, which includes hydraulic fracture and cavity expansion mechanisms. The experimental results indicate the growth of a fracture plane in soil in a very fast...

... skin friction. It is shown that the existing design methods, which are based primarily on correlations with unconfined compressive strength, are not appropriate for Irish rock socketed piles. Mobilised ultimate skin friction values are shown to be highly dependent on fracture spacing. It is suggested...

.... 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...

... metals & mining coal adsorption capacity prone coal Upstream Oil & Gas electromagnetic emission outburst prone coal Reservoir Characterization new model mechanism electromagnetic field structural coal electromagnetic response gas outburst coal sample fracture complex...

... 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...

... ABSTRACT: Stress waves propagating in fractured rock masses are attenuated (and slowed) due to the reflection and transmission at rock fractures. The deformation of the fractures results in the displacement discontinuity within wave fields across the fractures, and has significant effects...

... 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, therefore, first describes various ways in which fracture systems can be described...

...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...

... 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...

.... 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...

... 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...

... 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...

... 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...

... were governed pre- dominantly by structural anisotropies of foliated and graphitic gneisses, and to a lesser extent by aniso- tropies of the in-situ-stress field. Breakouts were observed mainly in steeply dipping gneiss sections of the upper 2500m, whereas technically induced hydraulic fractures...

... of the Siberian Division of the USSR Academy of Sciences, Novosibirsk, USSR ABSTRACT: The elements of the new theory of quantitative definition 0f fracturing, the estimation of structural hierarchy of rock massifs based on the spectral and correlation analysis of data of electrometric and nuclear-geophysical...

.... 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...

... Reservoir Characterization mechanism overbreak atomic energy Fracture Zone Shaft Excavation Upstream Oil & Gas shear failure shaft underground research laboratory orientation proceedings excavation URL microseismic activity fracture failure mechanism underground excavation...

... 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...

... oil sand complex reservoir minimum principal stress bitumen Upstream Oil & Gas wellbore storage breakdown pressure kPa Drillstem Testing pressure data Workshop Injection Rate principal stress interpretation fracture micro-frac test stress measurement hydraulic fracturing...

... 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...