Sifat-sifat Geoteknik Bahan Timbunan Inti Kedap Air Bendungan Batutegi.

Soil was already widely used as watertight materials in the embankment dam engineering, whereas, the selection and treatment (compaction) will influenced the geotechnical properties. As a watertight material the soil used should be impermeable for controlling seepage and have sufficient shear strength for controlling stability The aim of this research was to analyze the soil laboratory test results of core embankment materials obtained during the soil investigation and the construction stages of the Batutegi dam, a 125 meter in height of earth-rockfill dam in Lampung, Indonesia. The research analyzed the geotechnical parameters and the interrelations of the geotechnical parameters in order to indicate the geotechnical properties of the core embankment materials. The evaluation of the geotechnical parameters from the soil laboratory tests indicated that in term of density, permeability, swelling characteristic, compressibility as well as the strength, the core materials used at Batutegi dam meets the requirement as watertight materials in the embankment dam � engineering. Keywords: geotechnical properties, embankment dam, watertight materials