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Keywords: rock mass
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Proceedings Papers
Rockburst Prevention via Destress Blasting of Competent Roof Rocks in Hard Coal Longwall Mining
Available to Purchase
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
Keynote Session: Stress Measurements for Underground Powerhouses - Three Recent Cases
Available to Purchase
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
Microseismic Monitoring and Stability Analysis of the Deep Underground Caverns at Lianghekou Hydropower Station, Southwest China
Available to Purchase
Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-031
... 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...
Proceedings Papers
Support Method for Underground Engineering in Hard Rock With High Geostress: A Case Study of the Baihetan Hydropower Project, China
Available to Purchase
Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-004
... 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...
Proceedings Papers
Otjikoto Gold Mine - A Case Study in Pit Slope Design
Available to Purchase
Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-026
... 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...
Proceedings Papers
Parameters Required for the Design of Rock Support in High-Stress Rock Masses
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Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-006
... 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...
Proceedings Papers
Innovative Technologies for Monitoring Underground Excavations During Construction and Usage
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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...
Proceedings Papers
Investigation of Failures Associated With a Major Shear Zone in the Main Pit Cut 3 West, at Letšeng Diamond Mine, Lesotho
Available to Purchase
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
An Empirical and Numerical Approach To Quantifying Raisebore-Hole Stability
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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
Early Assessment of Dynamic Rupture and Rockburst Hazard Potential in Deep Tunnelling
Available to Purchase
Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-003
... 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...
Proceedings Papers
Lessons Learned From Large Failures: Multiple Causes Include Adverse Design, Geology, and Support
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Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-002
...) 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...
Proceedings Papers
The Significance of Identifying Potential Failure Mechanisms From Conceptual To Design Level for Open Pit Rock Slopes
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Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-028
... 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...
Proceedings Papers
Application of Rock Mass Classification and Blastability Index for Improving Wall Control at a Hard-Rock Mine in Botswana
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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...
Proceedings Papers
Characterization and Numerical Modelling of Standard and Cabled-Strapped Pillars in a Haematite Mine
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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
Fundamental Understanding of Underground Pillar Design Processes and Methods
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Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-082
... 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...
Proceedings Papers
A Remote Sensing Approach for the Derivation of Numerical Modelling Input Data: Insights From the Hope Slide, Canada
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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
Geotechnical Design Refinement in Parallel With Construction - Boschkop Abstraction Works, South Africa
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Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-056
... 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...
Proceedings Papers
Design of a Stoping Sequence at Deeper Horizons for a Lead-Zinc Mine in a Sheared Rock Mass
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Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-085
... 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...
Proceedings Papers
Stability of Large Underground Rock Caverns for Crude Oil Storage Operated Below Atmospheric Pressure
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Paper presented at the ISRM AfriRock - Rock Mechanics for Africa, October 3–5, 2017
Paper Number: ISRM-AFRIROCK-2017-094
... 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...
Proceedings Papers
Development of a Rock Mass Quality Model for an Open Pit Mine
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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...