Results of a critical state line testing round robin programme

Reid, Donald B.; Fourie, Andy; Ayala, Juan; Dickinson, Simon; Ochoa-Cornejo, Felipe; Fanni, Riccardo; Garfias, Juan; Fonseca, António Viana da; Ghafghazi, Mason; Ovalle, Carlos; Riemer, Michael; Rismanchian, Amin; Olivera, Roberto; Suazo, Gonzalo; Torres-Cruz, Luis Alberto

doi:10.1680/jgeot.20.d.002

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…In fact, the unsaturated test program will be compared to the CIU 200 sample. As expected, the CSL obtained lies near the CSL obtained in [16], being a material from the same TSF.…”

Section: Resultssupporting

confidence: 83%

“…The material used in this study consists of sandy silt gold tailings obtained from the surface of an active TSF. Tests for these tailings, although from other batches, have been performed for previous studies, including a round robin to determine the critical state line [16], calibration chamber tests [17] and a comparison between the behaviour in torsional shear hollow cylinder device (TSHC) and direct simple shear device (DSS) [18]. The properties of this material are summarized in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…Conventional triaxial tests were performed with a focus on the determination of the saturated critical state line (CSL). This included the testing of 5 loose samples, three under drained condition and 2 under undrained condition, in a range of confining pressures between 50 and 500 kPa and following state of the art practices as stated by Reid et al [16] and da Fonseca et al [19].…”

Section: Tests For Conventional Triaxial Testsmentioning

confidence: 99%

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Strain Softening response of loose unsaturated tailings samples in undrained triaxial tests

2023

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For a soil that is contractive and strain softening at fully saturated conditions the question remains on which degree of saturation can trigger a strain softening response. A common engineering practice is to adopt a saturation threshold (e.g., 85%) and then assume a fully saturated response when saturation is above that value. This study aims to understand how the strain softening response change when tailings are not fully saturated and to propose a systematic method for determining the saturation threshold. A restraint when preparing unsaturated loose samples is that it is likely to have collapse during flashing, thus changing void ratio and making comparisons between different degrees of saturation problematic. A simple procedure to obtain loose samples at different degrees of saturation but at similar post-flushing void ratios is explained and preliminary results of undrained shear strength obtained for gold tailings in triaxial device are presented and discussed.

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“…In fact, the unsaturated test program will be compared to the CIU 200 sample. As expected, the CSL obtained lies near the CSL obtained in [16], being a material from the same TSF.…”

Section: Resultssupporting

confidence: 83%