... are discussed and presented for a site in Pennsylvania. An analysis first begins with discontinuity mapping. In this study, quarry walls were mapped, and observations of active slope failures were made. The data collected were plotted on stereonets for cluster and kinematic analyses, which identified several...

... Characterization roorda quarry thb vertical load failure mechanism horizontal stress laboratory testing apparatus numerical model Upstream Oil & Gas constant vertical load lateral load platen Laboratory Scale apparatus lateral displacement ARMA 18 040 Development of a Laboratory Testing...

... to minimize excavation costs and risk management for constructed or natural slopes. metals & mining reservoir geomechanics field test Reservoir Characterization quarry coefficient total rollout distance rock fall trajectory field test Kingdom geometry primary impact distance Upstream Oil...

... and the application of sophisticated numerical tools for long-term behaviour prediction. It is therefore critical to determine appropriate geomechanical properties of the host rock. The Cobourg limestone is found near surface in the Bowmanville quarry, which provides access to samples for direct shear and other...

... of photogrammetry at the Delabole slate quarry in Cornwall, UK for remotely acquiring key discontinuity parameter data (orientation, intensity and length) and its subsequent use in developing statistically validated discrete fracture network parameters. The 3D distinct element code, 3DEC, is used for the DFN...

... Abstract: Rockfalls are a relevant hazard in quarrying and open-pit mining as well as in roads with rock cuts. The Spanish Association of Aggregate Producers reported that the most common cause of fatalities in their quarries comes from rockfalls. With the aim of having available methods...

... Abstract: In this study, the outcomes of an experimental program on the supporting effect of backfilling on the response and stability of abandoned mines, quarries and karstic caves and its verification in actual backfilling applications are presented. The backfilling materials were granular...

... ABSTRACT: Excavated rock slopes, such as those that result from massive exploitation operations in surface mining, can be subject to periodic rock instability events. These events can take the form of relatively localized instabilities such as rock fall, which are risky for quarry operators...

... ABSTRACT: Ornamental stone quarrying in the Carrara basin have determined the formation of several underground voids. A methodology, able to asses the stability conditions of the excavation, has been adopted in order to evaluate the safety conditions of both existing structures and forecasted...

... ABSTRACT : Discussed are the engineering geological mapping of the railroad and I-80 walls, and the seepage and stability analyses conducted for the Thornton Quarry high walls. Fracture mapping, using a laser transit, identified major discontinuities in three-dimensions. Numerical analyses...

... ABSTRACT: A criminal investigation required rapid drawdown of the water in an abandoned quarry. One wall of the quarry is 230 feet high, and the face overhangs with a dip of 65 degrees. This wall presented a potentially unstable condition during rapid drawdown. Failure of this wall would bury...

... rocks and joints. Mapping orientation, frequency of discontinuities and graphical presentation of data. Application of rock mass classification systems. Consideration of calculated values and optimization of the quarry faces for stability. Also to provide the most efficient fragmentation, toe...

... assessment of two roadstone quarries in limestone and basalt respectively. The paper concludes with a general discussion on the effectiveness of this method of evaluating the stability of jointed hard rock slopes. 1 INTRODUCTION Instability of hard rock slopes is mainly governed by the open pit geometry...

... quarries surrounding Anna, the results of which suggest a complicated regional stress pattern, with changes in the maximum horizontal stress direction from N45ºE to N15ºW. Since such abrupt stress fluctuations are rather atypical in the Midwest and since the reliability of near-surface tests in defining...

... structure blast design echelon quarry mechanism Winzer borehole seismograph Holloway initiator proceedings application Department of the Interior spectra Ritter fragmentation ground vibration vibration APPLICATION OF FRAGMENTATION RESEARCH TO BLAST DESIGN: RELATIONSHIPS BETWEEN BLAST...

... hydraulic fracturing Upstream Oil & Gas mount waldo granite site 2 hydrofracture Rock mechanics quarry site 1 horizontal stress gneiss stress measurement Maine stress direction granite Haimson fracture principal stress rockburst topography Magnitude THE RELATIONOF STRESSESIN...

..., reproducible strain relief measurements of horizontal stress components were successfully made at depths between .5 and 1 meter using a doorstopper-type strain gauge unit overcored with a 5cm diameter core drill. The rocks were flatlying Silurian carbonates exposed on the floors of shallow quarries...

... earlier. These fractures formed at applied stresses that were about 50 to 60 percent of the uniaxial compressive strengths of cylinders and prisms of Chelmsford granite that contain no flaw. Some of the sample geometries used in the experiments are similar to the geometries of large blocks in quarries...

... not conflict with experience. Within recent years the expansion of urban development in proximity to mining and quarrying activities, together with civil engineering earthwork and other activities concerned with urban redevelopment, have brought an increase in the occasions of conflect between the needs...

... and radial tensile cracking associated with the reflection of the stress pulse at the free surface. Reservoir Characterization Wellbore Design Upstream Oil & Gas particle velocity Rock Motion quarry blast quarry fly-rock velocity detonation free surface quarry face reflection distance...