, Page 0-0 (1)

Volume Title: ICASGE2017

DOI: ICASGE-GEO

Riyan R. Fauzi; Nur Khoirullah; R. Irvan Sophian

Jatinangor is the biggest education area in West Java, Indonesia. More than 500.000 students and 98.000 local people stay in this area. It also implies the development of many infrastructures to support the educational activities. To avoid the occurrence of problematic soils such as a swelling potential, it is necessary to identify the expansive soils as the basement of buildings and any infrastructures. The research method includes geological mapping, petrographic analysis, engineering geologic mapping, undisturbed soil sampling, mineralogical analysis and physical properties analysis. Swelling potential is analyzed based on visual identification, physical properties analysis, and mineralogical identification. The result of this study shows that the study area divided into three soil units due to the USCS (Unified Soil Classification System). Three of these units are high plasticity clay soil (CH) as the product of weathering tuff and pyroclastic breccia, low plasticity clay soil (CL) as the product of weathering of pyroclastic breccia, high plasticity silt soil (MH) as the product of weathering tuff deposits, and low plasticity silt soil (ML) as the product of weathering pyroclastic breccia and tuff deposits. Soil samples at CH area shows high - very high swelling potential, its activity ranges from 1.25 to 1.36 and composed kaolinite and montmorillonite clay minerals. Soil samples at CL area shows high swelling potential, its activity ranges from 0.59 to 2.35 and composed kaolinite clay mineral. Soil samples at MH area shows medium - very high swelling potential, its activity ranges from 0.56 to 1.58 and composed kaolinite clay mineral. Soil samples at ML area shows low - high swelling potential, its activity ranges from 0.34 to 0.89 and composed chlorite clay mineral.

expansive soils; Jatinangor; swelling; volcanic materials; weathering