Abstract
Soil consolidation as the dissipation of excess pore water pressure is mainly affected by the relative hydraulic conductivity among the layers. Geostatistical parameters such as the mean, the standard deviation, and the correlation length are physical indicators for each sedimentation and formation history. The effects of spatial variability on the excessive pore water pressure dissipation during consolidation process are investigated using numerical parametric studies, where multiple realizations are tested for selected hydraulic conductivity parameter using lognormal distribution. Numerical simulations show that the greater heterogeneity in hydraulic conductivity distribution applied, the longer time taken for the excess pore water pressure to dissipate, and the longer correlated variability encourages the greater variation in consolidation time. Such differences can be reduced significantly with the coupled drainage allowed by vertical drain method.
Highlights
Uncertainty in geotechnical properties is mainly promoted by the following three primary sources: measurement error, transformation uncertainty, and inherent variability [1,2]
This study explores the statistical characteristics of excess pore water pressure dissipation in heterogeneous soils, with the binary layers, Appl
Which shows that shows that the mean values for both normalized t and t are very similar, but the variation analyzing the consolidation process of soils with high variability, especially for the cases without in the mean consolidation time does not differ much with degree of consolidation, but the relative normalized is smaller that in normalized t50, values whichfor shows the mean consolidation verticalt90 drains
Summary
Uncertainty in geotechnical properties is mainly promoted by the following three primary sources: measurement error, transformation uncertainty, and inherent variability [1,2]. As dissipation of excess pore pressure, is characterized by the coefficient of consolidation Cv. The spatial variability in Cv has been observed in the site investigation profile. The 1D Terzaghi’s consolidation has been widely used to investigate the dissipation process of pore water pressure under multi-layers, and the results showed that non-homogeneous soil medium causes a different degree of consolidation compared to homogeneous [6,7,8,9,10,11,12]. This study explores the statistical characteristics of excess pore water pressure dissipation in heterogeneous soils, with the binary layers, Appl. All the numerical results obtained from spatially correlated random fields are analyzed with consolidation times t50 and t90 , that correspond to the average degree of consolidation 50% and 90%, respectively. This paper starts with random field generation, presents stochastic finite element modeling, followed by numerical results and analysis
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