EVALUATION OF ENTRY TUNNEL GROUND SUPPORT ON LONGWALL COAL MINE DESIGN AT PT XYZ USING FINITE ELEMENT METHOD

• Main Author: Adhyza Farhan, Ramadhan
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/51437
• Institution: Institut Teknologi Bandung

Longwall mining is a form of underground coal mining where a long wall of coal is mined in a single wedge. One of the methods of underground mining that many mining companies choose to mine coal is longwall. In longwall mining, the coal seam to be mined is divided into mining columns called panels. To start mining, the longwall method begins by making an entry point called an entry. Entry is an opening in an underground mine that functions as an access in and out of material and workers. Entries are made with a high level of security, this is done to avoid the risk of collapse that can cause loss, both material and fatality. Therefore, an evaluation of the stability of the tunnel opening must be carried out. The evaluation is carried out by simulating the tunnel opening in two conditions. Both conditions are in the form of tunnel opening models before and after being given support. The method used to evaluate is the finite element method by reviewing the results of the strength factor, yield element, and the buffer system capacity diagram. Then, the results of the tunnel stability evaluation were compared in the two conditions. The results of the stability evaluation of the tunnels before being given support have the worst condition with a strength factor value of 1.00 and a yield element of 100%. This shows that the stability of the tunnel is not safe and needs to be given a buffer. While the results of the stability evaluation in the tunnel after being given the support have the smallest strength factor value of 1.58; The yield element is 0% and FK diagram Steel set buffer capacity is greater than 1. This shows that the stability of the tunnel is safe.