Unsaturated shear strength parameters for a compacted iron ore tailings

The use of iron mining tailings in compacted landfills is expected to expand more and replace the placement dams. With this, unsaturated condition these materials becomes great importance for safety structures executed with them. In addition tests saturated condition, objective simplifying determination strength parameters direct shear constant water content were performed. Data physical chemical characterization tailings, retention curve at state continuously disturbed are also presented. latter aims evaluate effect process on final suction material. results suggest that there no significant variations suctions during failure that, this case, initial can be assumed same as one failure. indicate a high friction angle, which does not vary suction. data obtained, it was possible apply model Vilar (2006) obtain envelope presented aim only database ore parameters, but present procedure application content.