TY - GEN
T1 - Effect of spatial variability on probability-based design of excavations against basal-heave
AU - Luo, Zhe
AU - Atamturktur, Sez
AU - Juang, C. Hsein
PY - 2012
Y1 - 2012
N2 - This paper examines the effect of spatial soil variability, modeled as a twodimensional (2-D) random field, on the computed probability of basal-heave failure in a braced excavation in clay. The random field modeling (RFM) of clay is realized using a framework that combines Cholesky decomposition method and Monte Carlo simulation (MCS). Considering that the horizontal and vertical scales of fluctuation are generally unequal for clay, various combinations of the horizontal and vertical scales of fluctuation are examined within this framework. The effect of 2-D RFM of undrained shear strength of clay in a braced excavation is demonstrated with a case study that focuses on a simple probability-based design. The results show that negligence of the 2-D spatial random effect could yield a basal-heave design that is unduly over-conservative: at an acceptable or target failure probability level, the required factor of safety in a limit equilibrium analysis is unreasonably high.
AB - This paper examines the effect of spatial soil variability, modeled as a twodimensional (2-D) random field, on the computed probability of basal-heave failure in a braced excavation in clay. The random field modeling (RFM) of clay is realized using a framework that combines Cholesky decomposition method and Monte Carlo simulation (MCS). Considering that the horizontal and vertical scales of fluctuation are generally unequal for clay, various combinations of the horizontal and vertical scales of fluctuation are examined within this framework. The effect of 2-D RFM of undrained shear strength of clay in a braced excavation is demonstrated with a case study that focuses on a simple probability-based design. The results show that negligence of the 2-D spatial random effect could yield a basal-heave design that is unduly over-conservative: at an acceptable or target failure probability level, the required factor of safety in a limit equilibrium analysis is unreasonably high.
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U2 - 10.1061/9780784412121.294
DO - 10.1061/9780784412121.294
M3 - Conference contribution
AN - SCOPUS:84888334727
SN - 9780784412121
T3 - Geotechnical Special Publication
SP - 2876
EP - 2884
BT - GeoCongress 2012
T2 - GeoCongress 2012: State of the Art and Practice in Geotechnical Engineering
Y2 - 25 March 2012 through 29 March 2012
ER -