ANALISA STABILITAS LERENG CLAYSHALE PADA PEKERJAAN PEMBANGUNAN JALAN TOL BAWEN-SALATIGA PAKET 3.1 STA 22+900 – STA 23+500
ABSTRACT: The attempt to
provide toll road in Java has been developed rapidly. In the Solo-Semarang
route, the construction has reached packet 3 Bawen-Salatiga. An issue in packet
3 appeared in packet 3.1 between Sta 22+900 - Sta 23+500 because it is located
in a clayshale deposit area (Kerek Formation). Based on the N-SPT data obtained
from drill test for excavation structure, clayshale was not found in the layer.
From the soil description and geological review, the layer was dominated by
tuff breccia with andesite fragment. In the embankment of STA 22+975, CPT and
geoelectric tests were taken and the result from geoelectric showed the presence
of claystone which is the main material of Kerek Formation. Therefore, the
embankment is the weakest zone by ground movement. FEM analysis results were
compared using LEM method by Plaxis 8.2 and Slope/W 2007. FoS acquired from the
two methods showed insignificant changes. The static load calculation result
proved that the FoS of excavation and embankment structure was bigger than the
minimum standard required by USACE (FoS>1.30). FoS of embankment with two
configurations had a considerable value. The application of quake load in
accordance with 2010 earthquake zone map with 0.44 g acceleration revealed a
variety of FoS. In terms of the security over the excavation, the FoS was
bigger than the minimum requirement, which is >1.10.
Penulis: Fathan Zul Waskito,
Goji Pamungkas, Siti Hardiyati, Kresno Wikan Sadono
Kode Jurnal: jptsipildd160259
