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SIIA Público
SISTEMA INTEGRAL DE INFORMACIÓN ACADÉMICA - PÚBLICO
Título del libro: Geotechnical Engineering In The Xxi Century: Lessons Learned And Future Challenges Título del capítulo: Effect of Unsaturated Soil Zone on Slope Stability
An unsaturated zone or a negative pore-water pressure state in the soil
is present in slopes exposed to the environment. The objective of this
study is to demonstrate the changes in the computed factor of safety of
a slope when the unsaturated soil zone is considered or ignored. The
proposed analysis is conducted using the general limit equilibrium
method. The analysis considered a two-dimensional slope of a typical
embankment section assuming a simplification of pore-water pressure as
hydrostatic distribution, defined through a conventional seepage
analysis. The shear strength is evaluated using a non-linear equation
for unsaturated soils and the Mohr-Coulomb criterion for saturated
soils. The results show that the factor of safety is underestimated when
the negative pore-water pressure of unsaturated soil is neglected. In
contrast, if the unsaturated zone is involved, the factor of safety is
higher because soil suction increases the shear strength of the soil,
improving the slope stability.
