STUDY OF THE POTENTIAL UTILIZATION OF SHALE AS AN EMBANKMENT MATERIAL USING UNSATURATED SOIL MECHANIC PRINCIPLES

• Main Author: Lindawati
• Format: Theses
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/75008
• Institution: Institut Teknologi Bandung

Shale is the result of weathering or transportation of mechanical type sedimentary rock with the main constituent material being clay and having considerable swelling and shrinking properties (PI 33,1%). In addition to causing many problems, experts have difficulty in classifying it, this is because Shale has the properties (Intermediate Behavior) of soil and rock. In Indonesia, the distribution of shale is quite a lot, one of which is in the Jatiluhur formation which is generally an unstable zone with a lot of potential and history of landslide events. This research was conducted to analyze the effect of variations in the soil – water characteristics curve - wetting of galunggung sand, aggregate (hydrophilic material) and aggregate coating (hydrophilic material) by volume change value of shale. Tests in the laboratory using an elemental capillary column with 2 types of groundwater level modeling, namely +20cm for modeling I and +25cm for modeling II. Each model consists of 3 configurations namely sand barrier material with shale, aggregate uncoating barrier material with shale and aggregate coating barrier material with shale. Equilibrium time of 30 days is obtained from SEEP W/ analysis for all types of modelling. Variations in the results of the volume change of shale in model I were obtained, namely sand barrier material with shale ? = 4%; w = 14.38%; qw = 0.262 m3/m3, aggregate uncoating barrier material with shale ? = 0%; w = 8.54%; qw = 0.165 m3/m3 and aggregate coating barrier material with shale ? = 0%; w = 5.29%; qw = 0.105 m3/m3. In modeling II, the volume change material barrier value of sand with shale ? = 6% is obtained; w = 17.05%; qw = 0.302 m3/m3, aggregate uncoating barrier material with shale ? = 2%; w = 9.69%; qw = 0.185 m3/m3 and aggregate coating barrier material with shale ? = 0%; w = 6.46%; qw = 0.127 m3/m3. The use of hydrophobic material in model I and model II is quite effective in controlling the change shale volume. Thus the potential utilization of shale as an embankment material deserves to be developed further.