ANALYSIS OF ROCK LOAD HEIGHT FACTORS USING TWO DIMENSIONAL FINITE ELEMENT METHODS

• Main Author: Putri Winupratiwi, Darin
• Format: Final Project
• Language: Indonesia
• Subjects: Pertambangan dan operasi berkaitan
• Online Access: https://digilib.itb.ac.id/gdl/view/51504
• Institution: Institut Teknologi Bandung

Mining is one of the activities known to humans since time immemorial. In general, the stress conditions on the soil mass and rock are in equilibrium conditions. When soil and rock are disturbed by excavation activities, an imbalance will occur so that the soil and rock will try to reach a new equilibrium and result in collapse. This study aims to determine the factors that determine the height of the resulting collapse using the finite element numerical approach, as well as to perform a comparative analysis of the theoretical calculations and the numerical modelling of the height of collapse. The modelling of the height of rock load is modelled the software Rocscience 2. The tunnel was modelled in a horseshoe shape and with a width of 5 m and a height of 5 m with a weighting unit of 0.027 MN / m3. Modelling is carried out on each rock class based on the rock mass rating classification. Rock material parameters are calculated using the theoretical formula and also seen from the RMR table. After modelling the rock load height for each class was 0.3 m for class 1, 1.08 m for class 2, 3.91 m for class 3, 13.1 m for class 4 and more than 50 m for class. rock class 5. When compared with the theoretical calculation results the modelling results are directly proportional. There are two classes of rocks which have large errors compared to the theoretical calculations based on the theoretical calculation of many factors which are not included in the report. Factors that affect the height of the collapse include the condition of the rock, the depth of the tunnel, the stress that acts around the tunnel, and also the dimensions of the tunnel.