INTEGRATION OF GROUND BASED RADAR AND SATELLITE INTERFEROMETRY SYNTHETIC APERTURE RADAR (INSAR) IN BACK ANALYSIS OF ROCK STRENGTH USING NUMERICAL MODELING

• Main Author: Mawaddah Rafrin, Aida
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/80406
• Institution: Institut Teknologi Bandung

Slope monitoring stability is an important geotechnical aspect and primary geotechnical aspect to ensure mining can be operated safely and efficiently. Several monitoring instruments have recently been implemented in the mining industry. Currently, monitoring from both satellite InSAR platforms and ground-based has been widely used effectively to measure slope displacements. Displacement measurements are performed by assessing the phase change of the backscattered signal between adjacent acquisitions when there is movement on the ground surface. Interpretation of the slope monitoring results such as measured displacements data from both InSAR and Ground-based radar have been used in the back analysis method with the application of numerical methods to measure slope stability. To realize this, case study from Lowwall pit XYZ area of PT Bukit Asam tbk was used. Based on target area, the displacement monitoring data used from August 23th, 2022 – December 23th, 2022. In that period of occurrence failure on lowwall, the horizontal and vertical displacements occurred on the slopes are 321,75 mm velocity 26,81 mm/day and - 64,39 mm velocity -5,37 mm/day, respectively. Displacement/deformation measurement results from these two tools tend to provide the same movement trend values. The results of back analysis using 3D numerical modelling using the finite element method based on actual movement monitoring data which is correlated with numerical modeling shows that the Young's Modulus value resulting from laboratory analysis decreases when the slope movement becomes greater.