Study on Prevention of Sliding Failure of Nickel Ore in Bulk : New Procedure for Evaluating Shear Strength
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概要
- 論文の詳細を見る
Nickel ore is natural clay containing large lumps. Every year, around four million tons of this material is transported to Japan from Indonesia, New Caledonia and Philippine by bulk carriers of around twenty thousands to forty thousands tons dead weight tonnage. When nickel ore contains much moisture, slopes of its cargo piles in cargo holds may slide, because its shear strength is low. To prevent sliding failure of a bulk cargo, it is necessary to evaluate the shear strength of the cargo prior to shipment. Shear strength of nickel ore can be measured by direct shear tests or triaxial compression tests in a laboratory, and the stability of the cargo pile can be evaluated by slope stability calculation which is utilized in the field of soil mechanics based on the measured shear strength. Such method for evaluation, however, cannot be conducted at the time of, shipment of nickel ore, because it takes at least a few days. Taking these issues into consideration, we developed a new in-situ test procedure for evaluating shear strength of nickel ore which can be conducted at places of loading for nickel ore in a few hours in view of prevention of sliding failure. To develop the criterion for judgment on sliding failure of nickel ore, we carried out direct shear tests and slope stability calculations for nickel ore from five ports. The new test procedure mainly consists of three steps, i.e., removal of large particles, insertion of the sample in the mould and cone penetration test. First, particles larger than 19 mm are removed from the wet sample by passing through an appropriate sieve. Next, the sample is inserted in the mould and compacted to make a consistent specimen. Then the cone is pushed down into the specimen and the maximum value of reaction force is measured. When the force is less than 300 N, the nickel ore should not be accepted for loading without taking special safety measures.
- 社団法人日本船舶海洋工学会の論文
著者
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田中 正人
Research Institute of Marine Engineering
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URA Tamaki
Institute of Industrial Science, University of Tokyo
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太田 進
Ship Research Institute
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Ura Tamaki
Institute Of Industral Science The University Of Tokyo
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村山 雅己
Research Institute of Marine Engineering
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Ota Sususmu
Ship Research Institute
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Murayama Masaki
Research Institute of Marine Engineering
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Tanaka Masato
Research Institute of Marine Engineering
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Tanaka M
Research Institute Of Marine Engineering
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浦 環
Institute of Industrial Science, University of Tokyo
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