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List of products by author: D. Ofiara
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A Novel, Non-Circular Tunnel Boring Machine for Underground Mine Development
Abstract: TBMs have been used in mining in decades past, but their use has been limited and sporadic. This has changed in recent years, with TBMs being used at Stillwater Mine, Grosvenor Coal Mine Slopes, and Sirius Minerals potash mine. These machines are all full face, circular TBMs. With their circular bores, these machines have thus far been unable to tackle a larger issue for mines—the need for a...
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Hard rock TBM Tunnelling in Karst Conditions: Developments and Lessons Learned from the Field
Abstract: Years of experience and multiple projects have shown that TBMs can handle all sorts of karstic conditions if the situation is identified at an early stage of the project and the TBM is designed for the conditions . The major problems related to karst occur when the conditions are either not identified at an early stage of the project or are not detected under the operation until it is too late...
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Unique Hybrid EPB Design for use in Coal Mine Drifts
Abstract: The history of mechanized tunneling for mine exploration and access tunnels started more than fifty years ago with the Steep Rock Iron Mine in northwestern Ontario, Canada. The use of Tunnel Boring Machines (TBMs) in mines continued through the 1960s and 1970s, achieving high rates of excavation in soft rock, but their applicability was limited and their costs too high. Despite the drawbacks,...
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