INFLUENCE OF HEIGHT TO THICKNESS RATIO VARIATIONS OF BLOCKS ON ROCK SLOPE TOWARDS TOPPLING FAILURE USING PHYSICAL MODELLING WITH CENTRIFUGE TEST

• Main Author: PARDOMUAN KARRE (NIM : 12113027), TIMOTHY
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/24533
• Institution: Institut Teknologi Bandung

Mining is the activity of extracting mineral and non-mineral deposits from the earth’s crust which are considered valuable and economic. Mining can be done using two methods, which are surface mining and underground mining. The surface mining method is the most commonly used method in the mining activities in Indonesia. One of the most important factors regarding the surface mining method is slope stability. Toppling failure is one of the failures that can happened due to slope instability. To analyze slope stability, physical modelling in a laboratorium can be used, one of which is using centrifuge test. Centrifuge test is done to represent the variables that occurred in nature on a laboratorium scale. The physical model of the rock slope is made by constructing 15 rock slabs with a certain dimension to a predesign structure that resembles a rock slope. The variation of the slope’s geometry used is the height (h) to thickness (t) ratio of the rock slabs constructing the whole rock slope, the values of the ratio are 30, 25, and 20 with a constant thickness of 1 cm. Centrifugal force then is given to the physical model, with the angle speed starting from 10 RPM increasing at 2,5 RPM intervals until failure occurred. The test results show that the h/t value affects the slope stability. The greater the value of the ratio, the smaller the value of the slope’s stable angle. The greater the value of the ratio, the greater the volume of the failure’s debris and the smaller the critical acceleration.