Abstract:
The slope of the GI Kariangau, Balikpapan, East Kalimantan uses a combination of gabion
and geotextile construction to handle landslides on the slopes. However, there was a failure
that indicated deformation of the gabion reinforcement and damage to the geotextile sheet.
The failure of the reinforcement was caused by a landslide on the slope. This design begins
with the collection of the necessary secondary data. Then proceed to calculate the stability of
the gabion reinforcement at each level. This was followed by modeling the slope using the
Geo5 2020 slope stability demo version program to get the safety factor value. Analysis of the
program was carried out under various conditions, namely slopes before and after
reinforcement, excavation at the foot of the slopes, and variations in groundwater level. From
the results of the analysis, the value of the slope safety factor before and after being reinforced
was 5.46 and 5.76. An increase in the value of the safety factor before and after the
reinforcement of gabions shows that gabions play a role in increasing slope stability. The value
of the slope safety factor before and after the landslide was 5.46 and 0.78. The decrease in the
value of the slope safety factor before and after excavation activities shows that excavation
has an effect on reducing the value of slope stability but is still within safe limits. Rain
conditions affect reducing the value of soil parameters so that it affects the strength of the
slopes. The failure of the combined construction of gabion reinforcement and geotextiles was
caused by a decrease in the value of the shear strength of the soil due to saturated soil
conditions in the gabion reinforcement area.
