ANALISIS ZONA LEMAH (AMBLESAN) DI KAWASAN JALAN RAYA GUNUNG TUGEL KABUPATEN BANYUMAS BERDASARKAN SURVEI GEOLISTRIK KONFIGURASI WENNER
Abstract: The geo-electrical
survey with wenner configuration has been done in the Gunung Tugel street area,
Village of Kedungrandu, District of Patikraja, Regency of Banyumas. The
purposes of the research is to interpret the subsurface rocks lithology based
on the resistivity values, analyze the existence of the weak zone that spread
beneath of the subsidence zone surface on the highway, explore the existence of
others weak zones that located outside of the existing subsidence zone, and
explain the causes of the subsidence happened in this area. Modeling and
interpretation of the subsurface rock resistivity values is done using the
Res2dinv 3.54 and Surfer 10 software. The results of the modeling and
interpretation on the resistivity values at line GT-L01 and GT-L02 shows
subsurface rocks structure model in the form of the finely sand with a
resistivity values of 0.90 to 3.00 Ωm, marl rock with a resistivity values of
3.00 - 10.00 Ωm, and calcareous sandstones with a resistivity values of 10.00
to 26.00 Ωm. Beside the results of the research also show a weak zone beneath
of the subsidence zone surface and found some others weak zones outside of the
subsidence zone. The weak zone in this area is interpreted as fine sandstone
that softly and not compactly. While the others weak zones that located outside
of the subsidence zone are indicated potentially to be the cause of a new
subsidence on the highway. The subsidence that happened on the highway is
estimated because the rocks blocks in the weak zone are unable to support
changes in the layer structure above it, in the form of marl, as a result of
weight force and pressure resulted by most heavy-weighed vehicle which always
going through on this highway.
Penulis: Syukron makmur, Sehah,
Sugito
Kode Jurnal: jptlisetrodd160702
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