EVALUATION OF TIE POINTS SELECTION AND DEFORMATION MONITORING OF THE WEST LEVEE OF PT FREEPORT INDONESIA WITH GNSS MEASUREMENT

• Main Author: Risa Septaviari, Aufa
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/73474
• Institution: Institut Teknologi Bandung

<p align="justify">Tailings management as a form of rehabilitation for mining activities is carried out by constructing levee. In the construction of the levee, survey and mapping activities are needed to obtain information about the position of an object on the earth's surface. This activity is certainly inseparable from the use of tie points as a reference point in a measurements. One of the survey activities carried out is deformation monitoring which is useful to see the stability of the levee structure as a form of disaster mitigation. In positioning activities, GNSS (Global Navigation Satellite Systems) technology has been widely used because it can produce data with a high degree of accuracy. Through static GNSS measurement methods and secondary data in the form of Geotechnical Zone information, Fiber Optic analysis, and a previous static GNSS measurement data, a research was carried out which produced information regarding the comparison of the use of point N6005 (geodetic control point) and CORS CTIM as a tie point with a difference in coordinates between the two, namely ±0.095 m at the X coordinate, ±0.0172 m at the Y coordinate, and ±0.214 m at the Z coordinate. Furthermore, monitoring the deformation of the west levee area using the CORS CTIM point as a tie point resulted in a significant horizontal shift of 0.088 m at the 90B in period 1, 0.043 m at point 40B in period 2 and 0.028 m at point 40B in period 3. Meanwhile, a significant vertical shift occurred at 0.308 m at point 50B in period 1, 0.184 m at point 90B in period 2 and 0.091 m at point 40B in period 3.