TY - JOUR
T1 - Pore-water pressure accumulation during closely spaced earthquakes
T2 - Fundão Tailings Dam
AU - Stark, Timothy D.
AU - Lin, Jiale
AU - Gimenes, Evandro de A.
N1 - This work was supported by National Science Foundation (NSF Award CMMI-1562010). The contents and views in this paper are those of the individual authors and do not necessarily reflect those of any of the represented corporations, contractors, agencies, consultants, organisations, the Fundão Dam Review Panel, Samarco Mineração S.A., Vale, S.A., BHP Billiton Brasil Ltda., Cleary Gottlieb Steen & Hamilton LLP., Gibson, Dunn, and Crutcher, LLP, or any other entity or individual involved in the evaluation of the 2015 failure. The first author also appreciates the financial support of the National Science Foundation (NSF Award CMMI-1562010). The contents and views in this paper are those of the individual authors and do not necessarily reflect those of the National Science Foundation.
The contents and views in this paper are those of the individual authors and do not necessarily reflect those of any of the represented corporations, contractors, agencies, consultants, organisations, the Fundão Dam Review Panel, Samarco Mineração S.A., Vale, S.A., BHP Billiton Brasil Ltda., Cleary Gottlieb Steen & Hamilton LLP., Gibson, Dunn, and Crutcher, LLP, or any other entity or individual involved in the evaluation of the 2015 failure. The first author also appreciates the financial support of the National Science Foundation (NSF Award CMMI-1562010). The contents and views in this paper are those of the individual authors and do not necessarily reflect those of the National Science Foundation.
PY - 2023
Y1 - 2023
N2 - This paper focuses on pore-water pressure accumulation in loose sandy tailings during three (3) earthquakes within four minutes and the accompanying decrease in effective stress to assess the dynamic stability of the Fundão Tailings Dam, which failed on 5 November 2015. Results of laboratory cyclic direct simple shear tests are used to illustrate the accumulation of pore-water pressures with closely spaced low-level cyclic events. The seismically-induced pore-water pressures in the loose sands below the left abutment downstream slope and setback area are used to estimate the decrease in factor of safety with time until failure occurred within 20–30 minutes of the earthquakes. Field cone penetration and standard penetration test conducted prior to the failure are used to calculate the factor of safety against liquefaction to estimate pore-water pressures generated during the fore, main, and aftershocks in the sandy tailings. The effective stress stability analyses utilise a liquefied shear strength ratio for the sand tailings below the left abutment downstream slope and toe of the plateau because the sand tailings reached the critical state condition due to a reduction in the effective stress. SITE LOCATION: 20.206500°S, 43.467111°W.
AB - This paper focuses on pore-water pressure accumulation in loose sandy tailings during three (3) earthquakes within four minutes and the accompanying decrease in effective stress to assess the dynamic stability of the Fundão Tailings Dam, which failed on 5 November 2015. Results of laboratory cyclic direct simple shear tests are used to illustrate the accumulation of pore-water pressures with closely spaced low-level cyclic events. The seismically-induced pore-water pressures in the loose sands below the left abutment downstream slope and setback area are used to estimate the decrease in factor of safety with time until failure occurred within 20–30 minutes of the earthquakes. Field cone penetration and standard penetration test conducted prior to the failure are used to calculate the factor of safety against liquefaction to estimate pore-water pressures generated during the fore, main, and aftershocks in the sandy tailings. The effective stress stability analyses utilise a liquefied shear strength ratio for the sand tailings below the left abutment downstream slope and toe of the plateau because the sand tailings reached the critical state condition due to a reduction in the effective stress. SITE LOCATION: 20.206500°S, 43.467111°W.
KW - Earthquakes
KW - critical and steady state lines
KW - effective vertical stress
KW - liquefaction
KW - liquefied shear strength
KW - pore-water pressures
KW - post-liquefaction stability analyses
KW - slope stability
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U2 - 10.1080/25726838.2022.2147682
DO - 10.1080/25726838.2022.2147682
M3 - Article
AN - SCOPUS:85142707975
SN - 2572-6838
VL - 132
SP - 16
EP - 35
JO - Applied Earth Science: Transactions of the Institute of Mining and Metallurgy
JF - Applied Earth Science: Transactions of the Institute of Mining and Metallurgy
IS - 1
ER -