2D NUMERICAL MODELLING STUDY OF VACUUM PRELOADING METHOD, TRANS – SUMATERA TOLL ROAD PROJECT

• Main Author: DESILIA, ASRINIA
• Format: Theses
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/61305
• Institution: Institut Teknologi Bandung

Vacuum preloading method is used to improve soft soil Trans Sumatera Toll Road Project. One of powerful method to modelling it by finite element method. ABAQUS 6.13-1 Software is used to analyze the models. Numerical modelling vacuum preloading was performed by three steps based on permeability conversion. PVD’s model was carried out by considering smear zone and discharge capacity. Vacuum suction is modelled boundary condition negative pressure along the PVD. Modified Cam – Clay model was used to simulate soft clay soils. Effect of vacuum distribution (constant and linearly decreased) along the PVD was investigated. Prediction from this model such as settlement, pore water pressure, and lateral displacement was compared to actual field data. Degree of consolidation was estimated by using empirical calculation based on pore water pressure in the field. Numerical model with vacuum linearly decreased along the PVD is the closest to the field data. Vacuum pressure constant along the PVD can be used in design construction planning.