... the stability of the underground opening. For the purposes of this research, we are investigating the influence of macro-scale rock discontinuities to assess potential excavation instabilities across a range of different discontinuity patterns that may be encountered when excavating within layered rock masses...

..., rotational and toppling failure as potential instability mechanisms. Whereas the three first types involve sliding associated to different geometries of the unstable element or mass, toppling often involves also sliding and very complex geometries of multiple elements. In this sense, toppling should...

... stability analysis. geologist practice iop publishing iop conf sedimentary rock rock type geological subdiscipline structural geology reservoir geomechanics stability theory guayaquil instability environmental science 833 cerro san eduardo breakage ecuador government reservoir...

... Abstract Slope instabilities are one of the most frequent natural hazards capable of causing severe failures both at regional and large scales. Mudurnu, which is settled on a steep valley, is affected by regional rock slope instabilities. These instabilities constitute a hazard and create...

... Belfast; the West Wall is approximately 2,000 m long, 1,000 m wide and 500 m deep. In the past 4 years, the West Wall experienced numerous instabilities including two large-scale pit wall failures (referred to as ‘chasms’) and additionally several complex failures of varying scales across the entire...

... Abstract Mining is a high risk business and for every modern mining industry, the main aim of its open pit design is to create walls that will be stable for the life of the open pit, which in some cases may extend beyond the closure. As a result, any kind of instability should be manageable...

... to address various problematics related to superficial and shallow rock instabilities inside and outside the construction area. Moreover, the predominance of permafrost conditions required to adapt the techniques for the execution. While the first cableway from the north-side has been operational since...

... Abstract Ischia Island (Italy) experienced slope instabilities during the Holocene that occurred at different scales, from shallow mass movements up to large rock and debris avalanches. These events were strictly related to volcano-tectonic activity and the presence of a well-developed...

... to be used for different purposes. Artificial Intelligence Reservoir Characterization spatial reasoning Upstream Oil & Gas metals & mining accuracy instability Spatial analysis photogrammetry slope instability application procedia engineering 191 point cloud information geometry...

... and prevent future instabilities. This paper presents the investigations and interpretations of the structural geology, the impact on the stope stability, pillar behaviour and support. 1 INTRODUCTION Rowland Shaft is one of Lonmin's first generation vertical shafts, extracting both the Merensky and Upper...

... ABSTRACT: Various studies indicate that most of the slope instabilities affecting heterogeneous rock masses are related to differential weathering and erosion of the lithologies that outcrop in the slope. However, not all these rocks behave similarly, exhibiting considerable differences...

.... Empirical methods enabled straightforward determination of the need to include an intermediate pillar. A 3D boundary element model indicated that stress concentration in the roof was the main driver for instability. The 2D finite element model provided a FoS for roof failure of 1.20, considered adequate...

... and highly fractured rock, the erosion rapidly undercuts geological structures; enabling large instabilities to occur. When uncontrolled, the problem progressively worsens leading to the development of large chasms along major geological structures on pit slopes. Chasms up to 450 m high and 250 m wide have...

... response. These uncertainties are translated into hazards of potential rock mass instabilities, necessitating the need for measures to manage risk by eliminating, mitigating, accepting or transferring it. Each underground construction has varying degree of risk based on its actual site conditions...

...Rock Mechanics and Rock Engineering: From the Past to the Future Ulusay et al. (Eds) © 2016 Taylor & Francis Group, London, ISBN 978-1-138-03265-1 A modeling study of intersection lines and points as an assessing instability of rock mass A. Turanboy Necmettin Erbakan University, Konya, Turkey E...

... to the category others . For all other projects, maintenance is considered in excavation (excavation period). Categories of standstills Ground Inflow of gas Inflow of water Instability of excavation walls, squeezing Instability of excavation face Overbreak Technique Technical defect of construction site supply...

... of an open pit mine, to follow and detect movement intensities ranging from millimetric to metric scales. Several vulnerable parts of the mine have been studied and monitor- ing of these very small to very large instabilities has provided valuable information for risk and exploitation management at the mine...

... < 50, the medium is discontinuous: the failure occurs by block instability. One of the first steps of the analysis is the identification of the fractures families and of the joints properties; For Cf < 5 and cm/ 0 < 2, the failure could occur close to the wall of the cavity, by spalling of the rock...

... of the mine incipient instability problems were detected. Simplified stabilization methods were proposed, analysed and implemented, including the construction of a timber crib and the perimeter cabling of not-so-stable pillars in order to avoid rock-fall and progressive failure and to slightly increase pillar...

... Abstract The influence of water on slope instability can generate forces that may produce a total or partial terrain collapse. An exhaustive geotechnical, geological and hydrogeological analysis was carried out during the life of the mine and served a foundation for consecutive estimating...