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William Cain Joughin

William Cain Joughin
Independent Researcher · Mining

MSc Engineering, BSc Mining Engineering

About

31
Publications
10,731
Reads
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156
Citations
Citations since 2016
11 Research Items
113 Citations
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20162017201820192020202120220510152025
20162017201820192020202120220510152025
20162017201820192020202120220510152025

Publications

Publications (31)
Article
Full-text available
The paper is a summary of discussions on four topics in rockburst and dynamic ground support. Topic 1 is the mechanisms of rockburst. Rockburst events are classified into two categories in accordance with the triggering mechanisms, i.e. strain burst and fault-slip burst. Strain burst occurs on rock surfaces when the tangential stress exceeds the ro...
Article
Full-text available
The paper is a summary of discussions on four topics in rockburst and dynamic ground support. Topic 1 is the mechanisms of rockburst. Rockburst events are classified into two categories in accordance with the triggering mechanisms, i.e. strain burst and fault-slip burst. Strain burst occurs on rock surfaces when the tangential stress exceeds the ro...
Article
In selecting a suitable method to sink a vertical shaft for underground access, a number of constraints influence the ultimate decision of where and how to develop the shaft, not least among these being safety, development and construction time, and cost. Two additional considerations stand out: these being geotechnical conditions and technology, t...
Article
Full-text available
The orientations of discontinuity sets and major geological structures greatly influence the stability of an excavation. Excavations should therefore, where possible, be orientated such that major discontinuity sets and structures are considered, allowing the likelihood of rockfalls in a longhole stope to be kept to a minimum. The longhole stopes a...
Conference Paper
Full-text available
A method for risk-based design under high stress conditions is described in this paper. Probabilistic methods of analysis are applied to stress modelling to determine the probability of exceeding a given depth of failure. Suggestions are provided for dealing with geotechnical uncertainty. The understanding of aleatory variability can be improved by...
Conference Paper
Full-text available
The objective of installing support is to mitigate the risk of injuries and costs associated with rehabilitation of excavation damage and associated production downtime. It follows that the greater the likelihood of stress damage or rockfalls, due to the inherent rock mass conditions, the more work is required from the support system. In addition t...
Conference Paper
Full-text available
A stability analysis was carried out for an underground narrow vein room and pillar operation using linear elastic numerical modelling combined with a probability of failure (PoF) approach. The as-mined layout was input into the model to identify areas of increased pillar stress and obtain an average pillar stress (APS) for each pillar in an identi...
Conference Paper
Full-text available
A risk evaluation model was developed under funding from the Mine Health and Safety Council (MHSC, SIM060201 Track B) to quantify expected injuries and economic losses resulting from the rockfall hazard associated with a support system in a given geotechnical environment (Joughin et al., 2012a, 2012b). The technology enables the selection of a suit...
Article
A risk evaluation model has been developed, that enables the quantification of expected injuries and economic losses resulting from rockfalls associated with a support system in a given geotechnical environment. This enables the comparison of different support systems based on the expected frequency of injuries and the total cost of the support sys...
Article
A risk evaluation model has been developed that enables the quantification of expected injuries and economic losses resulting from rockfalls associated with a support system in a given geotechnical environment, which is described in Part I (Joughin et al., 2011b). Part II presents the validation of the risk evaluation model. Underground mapping of...
Conference Paper
Full-text available
Monolithic concrete-lined circular vertical shafts have been the preferred from of access to the deep ore-bodies of the South African goldmines for than fifty years. Without any steel reinforcement the linings almost without exception, have proved adequate in keeping shafts operating satisfactorily throughout the working life of the mines. The 1100...
Chapter
Full-text available
South Deep Gold Mine is carrying out massive mining at between 2400 and 2650 m and it is planned to extend this to depths of between 2900 and 3400 m. To facilitate resource estimation, a barrier pillar design was performed. Numerical analyses of the barrier pillars were performed to facilitate the understanding of the mechanisms likely to govern th...
Article
Problems with the stability and performance of rockpasses in deeplevel mines are common. This paper presents the results of an investigation into the recorded performance of rockpasses in deeplevel gold mines. Records relevant to the geological environment in which the passes are excavated, their excavation details, and their historical performance...
Article
Mud rushes are hazardous occurrences that have occurred frequently in mines in South Africa, and have been the cause of numerous fatalities in the past. Mud rush incidents not associated with accidents are believed to be common occurrences that are not generally reported. Many such incidents are probably associated with the operation of chutes and...
Conference Paper
Full-text available
At South Deep, mining currently takes place at a depth of between 2400 m and 2650 m below surface, but is planned to be extended to a depth of around 3400 m in the future. The orebody comprises Witwatersrand conglomerates and varies from 1 m thick to over 100 m thick and extends over several kilometres. The narrow tabular portion of the orebody (Ve...
Article
Full-text available
At Brunswick Mine, an increase in the number of seismically-related falls of ground and in particular rockbursts occurred during 1999. This was due to the ever-increasing stress levels in the remaining ore reserves, mining in difficult highly stressed areas and in particular troublesome geological features. In conjunction with the Noranda Technolog...
Technical Report
Full-text available
Mining often takes place in areas with steep and variable surface topography. Variable surface topography could be due to natural features such as valleys and hills, or man-made features such as excavations caused by surface mining operations or surcharging by dumping of spoil material, or tailings from the metallurgical plant. The research carried...
Conference Paper
Full-text available
In this paper, a risk based approach, has been applied to the design of chromitite pillars. The extent of failure in the pillars was modelled using the two-dimensional non-linear finite element program PHASE2. With this program, several different material types were modelled. Strength properties of the materials used in the models were described us...
Article
The nature of this project requires that various types of shotcrete be applied to a tunnel and that the performance thereof under extensive deformation be monitored over a period of time. In order to achieve this, one of the most critical tasks was to obtain an appropriate experimental field site. Finding the best site was of utmost importance to l...

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