Abstract

Mining tailings’ undrained strength (Su) is a relevant design parameter for tailings storage dams. One way to obtain Su, independent of sample extraction and along the depth, is to carry out field tests, such as the CPTu test. Given some uncertainties related to the estimation of Su from the CPTU test, this paper aims to evaluate the variation of this parameter statistically, comparing it with vane test results and understanding the main variables involved in correctly obtaining the parameter in bauxite mining tailings. The database includes results of CPTu and vane tests carried out at specific depths in two Brazilian bauxite tailings deposits. The results demonstrate that it is possible to establish a statistical model to estimate Su as a function of data obtained by the CPTu test (qt and fs), with an r² of 0.95.

Keywords:Undrained resistance; Mining tailings; Vane tests; CPTu tests; Statistical analysis