STUDY OF SOIL CONSOLIDATION BEHAVIOR WITH VACUUM PRELOADING METHOD: FIELD MEASUREMENT VERSUS ANALYSIS OF FINITE ELEMENT METHOD

• Main Author: Nur Adelina, Fithrie
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/47073
• Institution: Institut Teknologi Bandung

One of the problems that is often encountered when building a construction is the presence of soft soil in the field. Soft soil which is often a problem in the geotechnical field is clay which has low carrying capacity and requires special handling before a structure is built on it. However, in a condition where there is not enough soil that can be used to consolidate soft soil, an effective soil improvement method is by using vacuum preloading. This method is quite effective in repairing soft soils. The analysis was carried out using the help of the Abaqus finite element program by reviewing in terms of soil subsidence and pore pressures that occurred as well as the distribution of loads in the soil along the PVD. In this study, a comparison of the results of vacuum preloading monitoring in the field with the results of the analysis will also be explained. In addition, the comparison of the equivalence parameters of the Tran-Mitachi and Indraratna methods is also compared with a review in terms of land subsidence. The results of the analysis showed that soil subsidence under axisymmetric conditions, single strain plane strain and multi drain plane strain were 107.08 cm, 99.98 cm, and 115.53 cm. The results of the analysis of land subsidence were verified by monitoring results with the assumption that the initial start was at the same decrease of 21.77 cm. In monitoring, the average results showed a decrease in land of 129.03 cm. From the results of the analysis, the axisymmetric model, single strain plane strain, and multi drain plane strain showed a decrease in soil of 124.57 cm, 117.78 cm and 132.68 cm. In the results of the analysis of pore water pressure is assumed to be at the same initial start that is pore water pressure of 109.444 kPa. The results of the axisymmetry model, single strain plane strain and multidrain plane strain showed a decrease in pore pressure of 35.24 kPa, 48, 32 kPa, and 83.74 kPa. The results of the analysis of load distribution along the PVD at depths of -5 m, -8 m, -11 m, -15 m, -18 m showed results that amounted to 172.05 kPa, 164.44 kPa, 152, 96 kPa, 147.48 kPa , and 139.47 kPa. Comparison of soil subsidence using the permeability equivalence parameter of the Tran-Mitachi and Indraratna Method was compared and verified with the results of axisymmetric with soil subsidence of 107.08 cm. with the Tran-Mitachi method showed a decrease of 99.986 cm for plane strain single drain conditions. While with the Indraratna method, the decrease that occurred was equal to 101.98 cm.