CRITICAL GRAVITATIONAL ACCELERATION ANALYSIS ON THE STABILITY OF A TUNNEL ROOF WITH A JOINT ORIENTATION OF 45°

• Main Author: FAKHTUR ARVAN (NIM : 12114086), ARI
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/25762
• Institution: Institut Teknologi Bandung

Mining activities have various methods in its excavation. In the underground mining method, various types of openings are used in tunneling as an access to the ore body. Various considerations need to be taken into account in the construction of mine tunnels, as it involves the safety of miners and the tools that operate as well. The stability aspect is the main thing to consider in constructing a mine tunnel. Various analysis need to be done to ensure the stability of a mine tunnel. <br /> <br /> One form of analysis that can be done is by using physical modeling. The physical model, which represents the tunnel in its original condition, is tested using the centifuge test. The tunnel physical model on the centrifuge test is made by arranging tunnel roof blocks of a certain dimension to form a tunnel. Tunnel roof block variations used are joint orientations of 90°, 60°, and 45° along with joint spacings of 5.14 cm, 4 cm, and 3 cm. <br /> <br /> The test results show that the joint orientation in the tunnel roof block affects the stability of the tunnel. The more erect the joint orientation is, the easier it is for roof of the tunnel to collapse. The tes results also show that the joint spacing is directly proportional to the volume of tunnel roof failure. The bigger the joint spacing is, the greater the volume of tunnel roof failure that occurs.