DESIGN OF SOIL IMPROVEMENT WITH DEEP SOIL MIXING FOR EMPLACEMENT AND STOCKYARD IN GARONGKONG TRAIN STATION

• Main Author: Baihaqi Pasaribu, Irsyad
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/66940
• Institution: Institut Teknologi Bandung

Soft soil conditions often have a negative impact on infrastructure development in Indonesia. Soil improvement is one solution that is very useful in overcoming soft soil. Several methods that can be used include deep soil mixing (DSM), stone column, PVD, and others. The method used depends on the type of existing soil, construction costs, construction duration, availability of materials, and so on. This final project discusses the design of soil improvement in the emplacement and stockyard works of the Garongkong Train Station with the deep soil mixing method for Zone 1 (STA 3+750 – STA 4+000), Zone 3 (STA 4+300 – STA 4+500), and Zone 7 (STA 4+875 – STA 4+950). The design carried out must meet the design criteria for soil settlement, embankment stability, and liquefaction mitigation. The design of soil improvement with the deep soil mixing method begins with processing soil data from the results of field and laboratory tests to obtain existing soil parameters. After that, evaluation of soil settlement, embankment stability, and liquefaction potential was carried out. Evaluation of soil settlement and embankment stability will be modeled with the help of GTS NX software. The modeling is done by plane strain and axisymmetric methods. The safety value of the embankment stability will be evaluated using the concept of the strength reduction method (SRM). The liquefaction potential was evaluated by the methods of NCEER (1998) and Baez & Martin (1993). Based on the evaluation, it was found that the design criteria for soil settlement, embankment stability, and liquefaction potential were not met. The soil improvement design used in this final project is in the form of deep soil mixing with a square pattern, diameter of 0.7 m, spacing of 1.5 m, and LTP thickness of 0.6 m for each zone, while the length of the DSM pile used depends on the depth of the hard soil for each zone.