Environmental Engineering Reference
In-Depth Information
opportunity for greater ingenuity and design considerations
for soil slopes. Field measurements and monitoring are
needed to provide greater confidence with respect to the
use of computed changes in matric suction.
Matric suction can be eliminated after a rainfall in some
situations while in other situations matric suction may not
disappear over a reasonable time span. This phenomenon
has been observed based on in situ measurements of neg-
ative pore-water pressures in soil slopes as well as from
numerical studies. The fundamental behavior of infiltration
under both long-term steady-state rainfall and unsteady-state
rainfall conditions needs to be understood in order to identify
the most important factors controlling rainfall infiltration.
Engineers need to formulate appropriate questions to con-
sider when analyzing the long-term stability of a slope.
Measures can often be taken to maintain matric suctions
in slopes.
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