ANALISIS STABILITAS LERENG DAN ALTERNATIF PENANGANANNYA (STUDI KASUS LONGSORAN JALAN ALTERNATIF TAWANGMANGU STA 3+150 – STA 3+200, KARANGANYAR)
ABSTRACT: This final project
provides soil stability and the handling on alternative roads between
Tawangmangu-Plaosan STA 3+150-STA 3+200, Karanganyar. The landscape in this
area is rather steep and unstable, making the soil here has a high potential
landslides. Based on the results of the drill testing which has done manually
in this area, the soil contains gravelly-silt, sandly-silt and silt-stone. The
analysis was done with Fellenius method and Plaxis v.8.2. Based on Fellenius
method calculation, the safety factor value of the slope is 1,4701, while with
Plaxis software, the safety factor value is 1,3476. Those values above are less
than minimal safety requirement value of slope
which is 1,5, so this landscape has a great potential of landslide.
There are two alternative suggestions to handle this situation. The first one
is adding 10 meters of Bored Piles into Counterfort wall. The other method is
using 11 meters of Bored Piles. The choosen method for this project was using
11 meters of Bored piles. Bored Piles was choosen because it need lesser
concrete volumes than Counterfort wall. Those bored piles has diameters of 0,8
meters. It was placed at the +1191,50 above the ground and 16 meters from the
centerline. The results show that this alternative increase the value of safety
factor up to 1,6383.
Penulis: Rahmawan Bagus
Pratama, Imam Muslih Muhibbi, Indrastono Dwi Atmanto, Siti Hardiyati
Kode Jurnal: jptsipildd140487
