... Although the application of destress blasting as an active rockburst mitigation measure is not yet commonplace in hard coal longwall mining, the method is assuming heightened importance due to increases in mining depth and high horizontal stresses in the rock mass. The main goals of destress...

... Release of the in situ state of stress is often the most relevant action during the excavation of underground structures in rock masses, such as powerhouse caverns for hydroelectric schemes, which are often excavated at great depth and have large dimensions. Design of the supports, namely...

... in the surrounding rock mass, including the initiation, propagation, coalescence, and interaction of rock microfractures, was first demonstrated by analysing the temporal and spatial distribution of microseismic activity. The microseismic monitoring results were validated using conventional monitoring data and field...

... on the crack evolution and deformation tendency; shotcrete with high tensile strength is used to ameliorate the stress state of the rock mass' surface. The aim of these supporting efforts is to restrain the subsequent cracking and enhance the stress-bearing capability of the rock mass. Application...

... on laboratory testing data, together with data from geotechnical boreholes. The analysis of the sub-surface conditions was assessed using the Laubscher (1990) Mining Rock Mass Classification System. The results were used for limit equilibrium analyses and confirmed using numerical methods. As the focus...

... to high in-situ stresses is either rockbursting in hard and strong rock or time-dependent squeezing in soft and weak rock. The ‘driving force’ behind both rockbursting and rock squeezing is the strain energy released from the rock mass after excavation. In the case of rockbursting, the energy released...

... Tunnel design and excavation are complex problems that require in-depth studies and a lot of data. Since the second half of the 20th century, scholars have developed new methods in order to better understand the behaviour of the rock mass and provide appropriate construction solutions...

... future failure occurrence. The investigation involved a detailed area inspection, geological mapping, rock mass characterisation, discontinuity survey, kinematic analysis and a back-analysis. The field inspection revealed that the shear zone is composed of sheared and friable kimberlite, calcite, pyrite...

... Raiseboring technology has significantly reduced the disturbance caused to the surrounding rock mass compared to historical drilling and blasting techniques. However, the ground through which the shaft is established must be of sufficient quality to allow a free-standing and unsupported...

... are induced around underground openings (Hoek 2006) in brittle rock or rock masses with brittle structure. The Canadian Rockburst Handbook (Kaiser, McCreath, and Tannant, 1996) defines a rockburst as: ‘damage to an excavation that occurs in a sudden or violent manner and is associated with a seismic event...

...) can be blamed in each case, and if the shear strength or designed support are in question, massive failure may result. adverse design site characterization assumption Reservoir Characterization Barton proceedings rock mass rock engineering Upstream Oil & Gas cavern progressive...

... simplistic. Reservoir Characterization Wellbore Design criterion metals & mining Upstream Oil & Gas stability analysis reservoir geomechanics Engineering slope design discontinuity stability planar failure rock mass surface mining strength property wellbore integrity strength...

... The study sought to establish the applicability of rock mass classification as a primary input to wall control blasting at a hard-rock mine in Botswana. Conventional rules of thumb are used to develop blast designs based on parametric ratios with insufficient consideration of the rock mass...

...) can be used as a preliminary approach to pillar design, provided monitoring is then carried out to control pillar performance (Malan and Napier, 2014; Esterhuizen, Dolinar, and Ellenberger , 2011). Rocks and rock masses tend to show variable behaviour and significant scale effects, so in a mine...

... strength stability rock mass pillar layout Van der Merwe reservoir geomechanics lunder hanekom strength relationship pillar stress level deformation support pressure stress level Fundamental understanding of underground pillar design processes and methods J.W.L. Hanekom Middindi Consulting...

...), terrestrial laser scanning (TLS), structure-from-motion photogrammetry (SfM), and terrestrial infrared thermography (IRT) may be used for collecting rock mass data appropriate for input into varied numerical modelling approaches. To demonstrate our suggested approach, we have used the 1965 Hope Slide, British...

... Oil & Gas pump chamber stability structural geology boschkop abstraction work rock support excavation rock mass Reservoir Characterization classification Engineer investigation interpretation footprint South Africa cut face water management platform discontinuity cofferdam...

... stability sequence Reservoir Characterization stope strike length final stope metals & mining lode ground condition MRL wall rock sill pillar rock mass pillar Orebody reservoir simulation Plan View shear zone south lode sublevel footwall drive secondary stope Design of a stoping...

... at atmospheric pressure, for the large cavern section and rock mass quality expected, long-term stability can be achieved by conventional spraying of shotcrete and rockbolt installation. During operation, minimum pressure in the storage cavern close to vacuum is investigated and its impact on reinforcement need...

... In open pit mining, a rock mass model can provide important input for the optimization of production in relation to stability challenges and a safe workplace. In this sense, rock mass classification systems are useful for defining rock mass domains that identify areas of poorer ground conditions...