Eko Soebowo, Kamtono dan Herryal Z. Anwar
*) Pusat Penelitian Geoteknologi – LIPI
Kompleks LIPI, Jalan Sangkuriang, Bandung. 40135
Telpon : 022-2503654, 2507771, fax. 022.2504593
e-mail : eko.soebowo@geotek.lipi.go.id
Abstract
Regional development program at hinterland area require an information of land capacity and sub-surface geology. Several boring have been done at Puring, South Gombong to investigate the sub-surface condition and the engineering properties.
The result of the study shows the stratigraphy of this area consisted of 3 litological unit, ie. Sand and coastal deposit unit, silty clay with mangrove environment until shallow marine and inter bedded clay-sand with marine environment (Upper Halang Formation). Drilling and engineering properties data shows medium to dense of slit- clay layer and denser to the north. Bearing capacity of this layer tend to decrease at the middle of the section, and increases to the north.
Base on soil index properties, this layer has a medium to high expansive potential index, and tend to more expansive at the bottom of bore hole 1 (Sugihwaras). Therefore, the sub-surface stratigraphical aspect and the engineering properties of the layer shows that the Suguhwaras area and surrounding has a low bearing capacity index.
From : The 33rd Annual Convention & Exhibition 2004 Indonesian Association of Geologist