| 1. |
- Bhanbhro, Riaz, et al.
(författare)
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Mechanical Properties of Soft Tailings from different Depths of a Swedish Tailings Dam : Results from Triaxial tests
- 2020
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Ingår i: Scientia Iranica. International Journal of Science and Technology. - Tehran : Sharif University of Technology, Scientia Iranica. - 1026-3098 .- 2345-3605. ; 27:3, s. 1066-1074
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Tidskriftsartikel (refereegranskat)abstract
- Construction of tailings dams is done in stages by raising it layer by layer depending on production rate of a mine. These layered dams may possess different strengths and materials properties in each layer i.e. strength parameters, behavior with loading. Tailings dams may have loose layers in subsequent layers, which upon further loading may be susceptible to stability issues. Identification of material properties and behavior is important to know for safety of dam with further raising and long term perspective modeling. This paper presents the results from drained Triaxial compression tests conducted on samples collected from loose layers, from different vertical depths of a tailings dam. The results indicated that depth did not show much influence on strength parameters determined by drained triaxial tests. The different confining pressures influenced the strain-stress behavior, high confining pressures stress-strain curve showed tendency to formulate straighten line of stress-strain curve, with contractant volume behavior along axial strains. The influence of void ratio on effective stress ratio was observed.
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| 2. |
- Bhanbhro, Riaz, et al.
(författare)
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Mechanical Properties and Particle Breakage of Uniform-Sized Tailings Material
- 2021
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Ingår i: Journal of materials in civil engineering. - Luleå : American Society of Civil Engineers (ASCE). - 0899-1561 .- 1943-5533. ; 33:3
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Tidskriftsartikel (refereegranskat)abstract
- Tailings dam disasters are reported almost every year and are triggered by mechanisms, such as overtopping, piping, and others.The failures due to inadequate management cannot be neglected as well. These dams are constructed mostly in a step-by-step constructionmethod that leads to a continuously changing state of vertical loads during construction and may lead to particle breakage and changes instrength. Therefore, a layer of tailings dam today may not be the same tomorrow during the construction phase. To study the effects ofdifferent loads on particle breakage and strength, direct shear tests were performed on remolded tailings samples that were separated intodifferent particle sizes. The tests were performed using different normal stresses that ranged from 50 to 500 kPa. The results indicate that finertailings exhibited slightly more shear resistance than that of coarser tailings irrespective of the deposition method. For normally depositedspecimen, the dilatant and contractant behavior in vertical height was observed when the normal effective stress was less than 300 kPa andgreater than 300 kPa, respectively. Under the vertical deposition method, the finer tailings showed contractant height behavior when subjectedto a normal effective stress of 300 kPa. The friction angle and the cohesion of vertically deposited specimens were slightly higher and slightlylower, respectively, than that of normally deposited ones. The breakage of tailings particles was observed to be proportional to the particle sizeof the tailings.
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| 3. |
- Dahlberg, Anders, et al.
(författare)
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Svampar Fungi
- 2020
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Ingår i: Rödlistade arter i Sverige 2020. - 9789187853548 ; , s. 67-88
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 4. |
- Sundberg, Sebastian, et al.
(författare)
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Var fjärde växt och svamp är rödlistad
- 2020
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Ingår i: Svensk Botanisk Tidskrift. - 0039-646X. ; 114, s. 186-191
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Tidskriftsartikel (populärvet., debatt m.m.)
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