STUDY OF LOW WALL SLOPE STABILITY AT WEST TAMBANG AIR LAYA PIT BY USING BACK ANALYSIS METHOD FROM DISPLACEMENT DATA OF SLOPE STABILITY RADAR AND ROBOTIC TOTAL STATION

• Main Author: SYAFIQ YUDIANSYAH (NIM : 22115017), AHMAD
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/25204
• Institution: Institut Teknologi Bandung

Factor of safety can not always depict the real condition of the field. This happening because of the presences of uncertainty factors that affect the slope stability. In order to bridge stability analysis and field real condition, direct back analyisis is applicated. The purposes of this study is to applicate back analysis method, by using slope displacement data from slope stability radarand robotic totat station, also to identify the main factor that cause the failure. <br /> <br /> Comparison of displacement data from slope stability radar and robotic total station is carried out too. There are signifcant diffrences of displacement value from both equipments, but they give same tendencies that progressive movements of slope occurs during monitoring. Back analysis is carried on because the failure of slope happened, in order to determine the real shear strength parameter (cohesion and internal friction angle) of rock mass. Limit equibrium and finite element method are applied by using Slide 6.0 and Phase2 8.0 to compute the strength parameters and displacement. After that, Sakurai’s back analysis method also carried out to verify the result of direct back analysis before. Finally from phase2, the slope crtical SRF = 0,91 and 0,94 for cross section P3 and P7 models before undercutting happening. From that result, we can say that the reduction of rock mass strength due to heavy rain, plays important role to cause the failure