TUNNEL STABILITY ANALYSIS USING 2D AND 3D FINITE ELEMENT METHOD IN THE NOTOG RAILWAY TUNNEL

• Main Author: Hulwani, Zati
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/46297
• Institution: Institut Teknologi Bandung

Recently, the use of tunnels both for mining and civil purposes such as transportation facilities (railways) and waterways for hydroelectric power plants are growing up. This is caused that tunnels have several advantages when compared to transportation facilities and infrastructure constructed of the surface. Because of that reason, tunnel stability becomes necessary and need more attention during design and construction stage. This research is located in double track railway tunnel project of Notog BH 1440 between Cirebon – Kroya (Cikro), Central Java, Indonesia. Deformation analysis based on the results of monitoring rock mass by measuring the rock mass deformation around the tunnel is one way to find out the stability of the tunnel. Total Station is used to measure the deformation of tunnel performed at point STA 395 which has three points measurements, A = the left side wall (Eastern side), B = roof, and C = the right side wall (Western side). The tunnel deformation obtained at each point as follows, point A = 2.4 mm, point B = 1.5 mm, and point C = 2.2 mm, and the tunnel is still categorized as stable. Back analysis by trial and error in numerical modeling using 2D and 3D Finite Element Method that refers to the displacement of the monitoring results, and used the Mohr-Coloumb failure criterion, obtained that the Modulus Young (E) value for volcanic breccia material of 20056 MPa, sandstone is 1667 MPa, and claystone is 2139 MPa. FoS of the tunnel at point A, B, and C are 1.65, 2.46, and 2.05 respectively.