STUDY OF THE EQUILIBRATION TIME OF MATRIC SUCTION MEASUREMENT WITH FILTER PAPER METHOD FOR COMPACTED CLAY SHALE OF JATILUHUR FORMATION IN CISOMANG AREA

• Main Author: Salsabila Ramadhani, Hasnaa
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/49306
• Institution: Institut Teknologi Bandung

Clay shale is a material that is considered as a problematic soil by Indonesian geotechnical engineer because its behaviour that is greatly influenced by its saturated/unsaturated condition. Because of that, clay shale’s hydrolic property is needed to predict clay shale’s behaviour due to water content. In unsaturated condition, that behaviour is controlled by Soil-water characteristic curve (SWCC). One method to measure SWCC is filter paper method. In filter paper method, the sample and filter paper needs to be left for a certain time to achieve equilibrium. That time is called equilibration time. Equilibrium time is recommended for at least seven days, but there is no definite basis for this recommendation to be suitable for compacted clay shale. Before, SWCC for compacted clay shale have been researched with an equilibration time of fifteen days. Research for measuring equilibration time have been done in laboratory by leaving the sample and filter paper for a variation of time. This research has found that equilibration time of fifteen days is not enough for compacted clay shale and filter paper to achieve equilibrium. Equilibrium time will be determined by doing a hyperbolic regression on laboratory tests and numerical analysis. Regression has found that the equilibrium time for 10%, 20%, and 25% water content are, respectively, 53, 77, and 113 days. Numerical analysis has found that the equilibrium time for 10%, 20%, 25%, and 30% are, respectively, 35, 73, 100, and 166 days. From the equilibrium time, a corrected SWCC can be done for the SWCC that previously has been researched with fifteen days equilibrium time, although not fully because there are not enough data for higher water content.