Study of Mineralogy and Engineering Properties of Volcanic Rock at the Base of the Pamukkulu DAM Foundation, South Sulawesi, Indonesia

Abstract At the location of Pamukkulu dam, it has engineering geological characteristics that are less supportive construction above it, especially for foundation dam. By taking data directly in field and by laboratory testing, information is needed regarding characterization mineralogy properties rocks. Mineralogical analysis was performed with petrography X-Ray Diffraction (XRD) while rock were Plate Bearing Tests (PBT), Standard Penetration (SPT), Rock Mass Rating (RMR). Based on mineralogical data, rocks have undergone weathering converted chemical-physical minerals into porous, fine-grained minerals, forming mineral oxides as well clay minerals. The carrying capacity surface soils dam area based plate bearing test relatively poor. As subsurface rocks, weight mass rating belongs to class (II) Good (III) Medium. Meanwhile, from density value hard soils, there different depths a depth 1 meter 6 meters. Weathering conditions affect where due formed form porous they not consolidated.