PERILAKU INTERAKSI TANAH-GEOTEKSTIL TERHADAP PARAMETER KUAT GESER
ABSTRACT: Soil reinforcement
using geo-textile is one of geotechnical structures, involving soil-structure
interaction. Recently, the problems are solved by neglecting the interface
influence between soil and structure. To obtain more realistic stress-strain
relationship, it is required to study the soil-structure interface. The study
of behavior of soil-geotextile interaction on the shear strength parameters is
discussed in this research. The used soils in
this research are
uniform sand and clay.
The uniform sand
has relative density
of 50% and
90%. The clay
sample is based
on the maximum
dry density (MDD) value obtained
from standard Proctor test. Determination of interface parameter on the shear
strength of sand-geotextile and clay-geotextile is obtained from direct shear
test. The interface shear strength parameters are friction an-gle of interface
()
and adhesion (ca).
The used geotextile
types are woven,
non-woven and geomembrane.
Numerical simulation is also carried out to study the influence
of variation values on interface shear strength parameters. Result of the
research gives review on the behavior and interface modeling of
soil-geotextile. Values of friction angle of interface () obtained
from sand-non-woven geotextile are higher than sand- woven geotextile.
The value of obtained from sand-geomembrane is the
lowest. Ratio of / for non-woven geotextile ranges between 0.8 1.0. Ratio
of / for woven geo-textile is about 0.7 0.8. Geomembrane ratio of /is
about 0.6 0.7. The value of / is relativelyconstant for sand
un-der both saturated
and dried conditions.
For clay sample,
the values of
ca and are
lower than value
of soil shear strength parameters. The shear
stress of geomembrane interface (HDPE) is the lowest under both saturated and
unsatu-rated conditions. The interface shear strength parameters are influenced
by the roughness of material and effective open-ing size of interface material.
For clay, the values of ca/c and / are influenced
by saturation conditions of soil. Influ-ence of
ca and parameters
is represented by value
of Rinterface parameter.
Higher Rinterface value will
decrease the displacement, moment and shear force and increase
the safety factor. The result of this research can give contribution on determination
of interface shear strength parameters in the analysis of soil reinforcement
using geotextile in order to de-sign optimalization.
Penulis: Ahmad Rifa’i
Kode Jurnal: jptsipildd090018
