NUMERICAL STUDY ON DESIGN CHART DEVELOPMENT OF RIGID INCLUSION FOR SOIL IMPROVEMENT WITH LIQUEFIABLE SOIL AT N AIRPORT IN PAPUA

• Main Author: Aesha Yoesoef, Melanesia
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/68945
• Institution: Institut Teknologi Bandung

N Airport in Papua is one of the targets for airport development in Indonesia. The soil at this location is dominated by loose sandy silt that has the potential to experience liquefaction based on the results of checking the potential for liquefaction. Rigid inclusion is an alternative method of soil improvement that is used to mitigate this potential in accordance with the factual conditions in the field. This thesis aims to produce recommendations for rigid inclusion analysis results in mitigating the potential for liquefaction at a predetermined location in the form of a design chart with variations in the relative soil density and parameter configurations (depth, spacing, and diameter) of rigid inclusion. The analysis carried out in this thesis included tabulating soil data, checking the potential for liquefaction using the empirical method (Simplified Seed's Method), processing earthquake data to produce ground motion input, as well as rigid inclusion modeling in various variations of soil relative density and parameter configuration using numerical methods using FLAC 2D. The results of these analysis show that the soil at this location has the potential to experience liquefaction to a depth of 15 m with an earthquake acceleration that occurs in bedrock for a 500-year return period of about 0.3152 g where shallow crustal is the dominant earthquake mechanism. The result of rigid inclusion modeling using FLAC 2D shows that the largest excess pore water pressure value occurs in soil with lower relative density. The design chart in the form of a graph of excess pore water pressure against depth shows that excess pore water pressure will increase as the ratio of spacing per diameter increases, inversely for excess pore water pressure which will increase as the ratio of depth per diameter decreases.