Browsing by Author "Nugroho Soewignjo Agus"

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    KORELASI HASIL UJI MACKINTOSH PROBE DENGAN KUAT GESER TANAH LUNAK
    (2013-03-30) Safitri, Rizka; Ferry, Fatnanta; Nugroho Soewignjo Agus
    The Mackintosh Probe is a lightweight dynamic penetrometer and a considerably faster and cheaper than boring tool, particularly when the depth of exploration is moderate and the soils being investigated are soft. Popularity of this method in Indonesia is low. Therefore, correlation between Mackintosh Probe and shear strength rarely found for soft soil. On this research, field test and laboratory test were performed. The field test consist of Mackintosh Probe test, Vane Shear test and Hand Bore. Meanwhile, laboratory test consist of physical properties of soil such as water content, unit weight, plasticity and specific gravity were explored. Triaxial test was explored too. The data are arranged and analyzed for correlations. The result shows that the test specimen is organic material with highly water content. The correlation which was obtained from the result showed the relationship correlation between M and Su, M and c, M and ϕ also w and M. Triaxial test result showed a weak relationship than Vane Shear test result. This research shows that Mackintosh Probe not compatible for using in soft soil where located in coastal area.
  • No Thumbnail Available
    Item
    KORELASI PERMEABILITAS BERDASARKAN UKURAN BUTIRAN DAN PLASTISITAS TANAH
    (2013-01-09) Irawan, Hendra; Nugroho Soewignjo Agus; Satibi Syawal
    Research to determine the coefficient of permeability based on effective grain size of sand have been carried out by several researches. Those research is mainly aimed to develop equation to predict permeability of soils. However, the relationship between permeability and fine fraction has never been specifically considered. This study was performed to find the relationship between the coefficient permeability and soil properties and soil classification related to fine fraction. In addition to that, the suitability of permeability equation to available data is evaluated. Nearly 100 undisturbed samples were tested for their coefficient of permeability in laboratory. Grain size, hydrometer, and consistency analyses were also performed. The data obtained from the testing soil properties such as the value of k, liquid limit (LL), plastic limit (PL) plasticity index (PI), percent sand, percent fine, percent silt, and percent clay. The data are than arranged and analyzed for possible correlations. It is found that previous correlations cannot be used because the soil in this study are mainly fine grained soil, were as the existing equation are suitable for sand. Fat clay is the smallest soil permeability, the next row is, and lean clay, lean clay with sand, sandy lean clay, and most of it are clayey sand. Obtained relationship between permeability and fine grains are k = (205.15e-0.081xF) x 10-6 in cm/sec. The equation applies if the fines contained in the soil between more than 25%.