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http://dx.doi.org/10.12989/gae.2022.29.5.497

Tailings fluidization under cyclic triaxial loading - a laboratory study  

Do, Tan Manh (Department of Civil, Environmental and Natural Resources Engineering, Lulea university of technology)
Laue, Jan (Department of Civil, Environmental and Natural Resources Engineering, Lulea university of technology)
Mattson, Hans (Department of Civil, Environmental and Natural Resources Engineering, Lulea university of technology)
Jia, Qi (Department of Civil, Environmental and Natural Resources Engineering, Lulea university of technology)
Publication Information
Geomechanics and Engineering / v.29, no.5, 2022 , pp. 497-508 More about this Journal
Abstract
Tailings fluidization (i.e., tailings behave as being fluidized) under cyclic loading is one concern during the construction of tailings dams, especially in the shallow tailings layers. The primary goal of this study is to evaluate the responses of tailings under cyclic loadings and the tailings potential for fluidization. A series of cyclic triaxial undrained and drained tests were performed on medium and dense tailings samples under various cyclic stress ratios (CSR). The results indicated that axial strain and excess pore water pressure accumulated over time due to cyclic loading. However, the accumulations were dependent on CSR values, densities, and drainage conditions. The fluidization potential analysis in this study was then evaluated based on the obtained cyclic axial strain and excess pore water pressure. As a result, tailings samples were stable (unfluidized) under small CSR values, and the critical CSR values, where the tailings fluidized, varied depending on the density of tailings samples. Tailings fluidization is triggered as cyclic stress ratios reach critical values. In this study, the critical CSR values were found to be 0.15 and 0.40 for medium and dense samples, respectively.
Keywords
critical cyclic stress ratios; cyclic characteristics; tailings fluidization;
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