Abstract:
The objective of this master project was to investigate the stability and deformation of soil slopes in Bueng Nong Bon using the Finite Element Method (FEM) with PLAXIS 2D software. To accomplish this, the analyzed results from FEM were compared with measured actual data of soil behavior during water pumping to a level of -5.00 meters (AMSL). The study simulated the drawdown of water from Bueng Nong Bon, starting from 0.00 meters AMSL to a lowest point of -7.00 meters AMSL, at a pumping rate of 60 cubic meters per second.The analysis results revealed that the four studied cross-sections of Bueng Nong Bon's slopes (Sta. 4+700, Sta. 5+050, Sta. 5+150, and Sta. 5+450). All sections had a Factor of Safety greater than 1.0. This indicates that the slopes are sufficiently stable even if the water level is drawn down to the minimum retention level. The maximum observed slope deformation was 20.97 centimeters. When comparing the results from PLAXIS 2D with the measured actual data of soil behavior during water pumping at -5.00 meters AMSL, it was found that the results differed. The smallest difference was 0.00 meters, while the largest difference was 1.0 meter.