... uniquely. Glastonbury & Fell (2002) used the term ‘collapse’ to denote the single point of sudden movement, disaggregation and associated large-scale displacement. real time system likelihood slope failure excavation risk management slope instability area coverage metals & mining...

... ABSTRACT ABSTRACT: Microseismicity has been extensively used to monitor rock mass response to stress changes; in particular excavation induced damage at underground mines and engineered structures. A methodology has been developed to extract information on fracturing mode and orientation...

... ABSTRACT ABSTRACT: A noncircular tunnel was excavated in massive granite. The tunnel geometry and orientation relative to the stress field had been selected to minimize the potential for the development of an excavationinduced damage zone. The extent and characteristics of this excavation...

... properties such as normal stiffness, shear stiffness, aperture etc, govern flow through fractures in hydraulic (H) and hydro-mechanical (HM) analysis. In this study H and HM analysis of fractured rock masses were performed and water inflow into underground excavations were determined. Also, the effects...

... ABSTRACT ABSTRACT: Knowledge of the temporal and spatial evolutions of displacements occurring in the vicinity of underground openings is essential to understanding the response of a given rock mass to its excavation. The study presented in this paper aims at assessing the potential of laser...

... ABSTRACT ABSTRACT: Washington-Dulles International Airport (Virginia, USA) has been expanding its capacity since 1999. This expansion has required extensive vertical, open-cut rock excavations to depths of up to approximately 20 m adjacent to existing infrastructure for construction of new...

... operators minimize the amount of loose or damaged rock surrounding a blasted opening. The goal of the research is to show that better perimeter control in underground excavations will decrease the number of accidents associated with ground fall injuries as well as decrease the exposure to hazards associated...

... The design of underground excavations in rock must account for the influence of structure, stress, as well as the size, shape of an excavation and its intended use. Although there are several analytical, empirical and numerical tools available, it is recognized that these tools have inherent advantages...

... mass characteristics, caused by the excavation disturbed zone, is supposed to be captured in the local rock class, as support will be chosen. Rock mass characterization reflects a broader mission to describe the character of a rock mass where a future project is likely to be realized, but no excavation...

... parallel tunnels, each 9 m in diameter, in young sedimentary rocks. The tunnels are excavated by normal drill and blast methods. The second tunnel face is about 70 to 100 m behind the first one. Headrace tunnel length is about 4.8 km, and the excavation was carried out through three accesses: from...

... ABSTRACT ABSTRACT: Design and construction of roads and foundations on steeply dipping slopes and weak bedrock creates challenging rockslope engineering problems because of the kinematic potential for failure into the rock excavations. Nevada Power Company (NPC) is constructing the 83km...

...-term and data will be collected over a multi-year period. The particle detector associated with this experiment will need to be built at depth underground within a very large cavern. Experimental options currently under consideration call for the excavation of rock spans in excess of 50 m, mined...

... by geomorphologic peculiarities (mixed face conditions, variable orientation or rock masses and structure) such as flysch materials. In addition, portal stability problems, and geometrical issues such as the effects of simultaneous twin tunnel excavation on radial displacements of each bore are also key...

... ABSTRACT ABSTRACT: A combined geological and rock mechanics approach to tunnel face behaviour prediction, based on improved understanding of brittle fracture processes during TBM excavation, was developed to complement empirical design and performance prediction for TBM tunnelling...

... ABSTRACT ABSTRACT: We report on two sites in Iceland, Blanda and Kárahnjúkar, where hydraulic fracturing stress measurements were performed in the initial stages of pre-excavation design of two underground hydroelectric projects. The dominant rock is young basalt, naturally fractured...

... parameters of events associated with dewatering, excavation, and various rock mechanics experiments, and estimate source kinematics caused by activity within or near the mine. Given the damage location of the event determined by the array, the rock mass can be back-excavated to find the source damage...

... with detailed technical information. Major factors affecting stability of underground excavations in the selected cases are examined to identify conditions likely to cause ground failures and areas prone to ground instability. Based on these findings, a comprehensive approach is discussed to address ground...

... split into five sections, with three intermediate accesses. With overburden up to 2,000m the rock mass is affected by high stress. The southern 17 km section was recently completed in October 2006, by means of two TBMs, each 9m in diameter, and was excavated for the most part in massive gneisses, where...

...) and the 3rd operation phase (12 years). The field investigations in Phase I started in 2001 and ended in 2006. Phase II stated in 2005 and the ventilation shaft and the east access shaft will be excavated approximately 50m in depth at the end of March of 2007. 2 PRESENT STATUS 2.1 Geological environment...

... historically. The stability of off-reef excavations was threatened under further mining, and the long term viability of the mining operation had to be assessed. A seismic hazard assessment methodology using numerical modelling, both static and dynamic, and seismic back-analysis was developed. This methodology...