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Keywords: rock mass
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Proceedings Papers

Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-033
... 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...
Proceedings Papers

Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-028
... stability rock mass mining discontinuity planar failure Hoek probability failure mechanism AfriRock 2017 Rock Mechanics for Africa Cape Town, 2 7 October 2017 The Southern African Institute of Mining and Metallurgy 351 The significance of identifying potential failure mechanisms from conceptual...
Proceedings Papers

Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-003
... 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...
Proceedings Papers

Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-004
... 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 of...
Proceedings Papers

Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-029
... 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...
Proceedings Papers

Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-035
... 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...
Proceedings Papers

Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-045
... 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. These...
Proceedings Papers

Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-006
... related 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...
Proceedings Papers

Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-026
... 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 of the...
Proceedings Papers

Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-031
... 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...
Proceedings Papers

Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-032
... 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...
Proceedings Papers

Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-002
... geology shear strength adverse factor knowledge management Engineering cavern collapse tangential stress construction tunnel rock mass nick barton AfriRock 2017 Rock Mechanics for Africa Cape Town, 2 7 October 2017 The Southern African Institute of Mining and Metallurgy 17 Lessons learned...
Proceedings Papers

Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-073
... 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...
Proceedings Papers

Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-063
...) 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...
Proceedings Papers

Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-094
... 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...
Proceedings Papers

Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-085
... stope strike length final stope metals & mining lode ground condition MRL wall rock rock mass reservoir geomechanics rib pillar stability sequence Orebody sill pillar pillar Plan View reservoir simulation shear zone south lode sublevel footwall drive secondary stope...
Proceedings Papers

Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-066
...), 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...
Proceedings Papers

Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-056
.... Reservoir Characterization classification Engineer Upstream Oil & Gas pump chamber investigation interpretation water management platform discontinuity cofferdam stability rock mass Shaft Excavation construction structural geology boschkop abstraction work rock support excavation...
Proceedings Papers

Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-082
... Oil & Gas strength stability Van der Merwe deformation pillar stress level pillar support pressure structural geology pillar strength pillar behaviour rock mass stress level AfriRock 2017 Rock Mechanics for Africa Cape Town, 2 7 October 2017 The Southern African Institute of Mining...
Proceedings Papers

Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-077
... 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...

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