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Determination of dry density in tailings with a Dynamic Cone Penetrometer:
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Today mines produce metals which are used for everyday products by people worldwide. When metals are produced, waste products known as tailings are generated. These tailings are commonly stored in impoundments, surrounded by embankment dams. The demands from the society are constantly increasing regarding the quality and safety of dams. One step in development towards a better control regarding safety and quality of tailing dams, could be to compact the beach. Today there is a lack of methods to easy check the dry densities over large areas for a compacted material. Since these dams can be large structures with embankment lengths of several kilometers, it is necessary to be able to check the density with a fast method. In this thesis it was investigated if the dry density, and correspondingly the compaction, can be checked with a Dynamic Cone Penetrometer (DCP). In the thesis the dry density of tailings was compared with penetration rate of the DCP. A laboratory setup was made with a test box filled with tailings provided by Boliden AB from the Aitik mine. Six different box tests were performed, each test with different compaction. From the tests a trend was observed, for which the tailings increased in density as the DCP indexes showed an increased resistance. A relationship between DCP index and dry densities was found. Though a relationship was found, it is important to emphasize that the tests were carried out in an environment that was easy to control. One test with high water content showed that water was influencing the DCP index results. Therefore it was concluded that if the DCP will be used in field, the water content also has to be checked.

Place, publisher, year, edition, pages
2017. , p. 65
Keywords [en]
dynamic cone penetrometer, tailings dam, tailings beach, tailings
National Category
Geotechnical Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-66993OAI: oai:DiVA.org:ltu-66993DiVA, id: diva2:1165866
Educational program
Civil Engineering, master's level (120 credits)
Supervisors
Examiners
Available from: 2017-12-15 Created: 2017-12-13 Last updated: 2017-12-15Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
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Language
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