ANALISIS GROUTING TEST, STUDI KASUS PERENCANAAN BANGUNAN GEDUNG PT. ASTRA OTOPARTS (PERSERO) TBK, KECAMATAN NGALIYAN, KOTA SEMARANG, JAWA TENGAH

Abstract

Indonesia is a country that located at the confluence of three major plates, making it
prone to ground movements disaster. PT. Astra Otoparts (limited) is a company that
set up branch office in semarang and located in areas that experiencing local mass
movement (local). This happens because there is a slip plane, has a lithology that
consits of soil embankment and clay that has low value of cohesion and poor
consistency. Therefore, it should be made ground investigation to determine how
much strength and physical condition of the soil, so as to know the proper methods to
overcome these problems.

The method used is grouting, but before doing grouting, grouting experiments needs
to be done, ie grouting test. Grouting test is a method that used to determine the
effectiveness of the grouting to be done.

Based on the analysis that has been done, we can know that the grouting method can
increase the carrying capacity of the land on the foundation of the building. After the
measurement, the value of N-spt increase from 2 up to 19 in the CH-2 and in CH-1 up
to 21 in depth 4.50m to 5.00m. In the depth 9.50m to 10.00m at each check bore hole
the value of N-spt from the previous 16 - 21 up to more than 60 in each hole. In the
depth 14.50m to 15.00m at each check bore hole the value of N-spt increased from
the previous 48 - 49 up to more than 60. Efforts to increase the value of SPT with
grouting method on soil that has a low bearing capacity at PT. Astra Otoparts
successfully performed, so that the process of building PT. Astra Otoparts can
proceed.