ANALYSING THE LIMITATIONS OF THE KIRSCH EQUATION IN CALCULATION OF STRESS DISTRIBUTION AROUND THE SHALLOW TUNNEL

• Main Author: Bonaventura, Adrian
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/43487
• Institution: Institut Teknologi Bandung

Underground construction can be conducted in the form of civil and mining tunnels. Before the construction of tunnel, induced stresses distribution analysis surrounding the tunnel must be calculated. The aim is to find out the stresses distribution condition of rock mass if it’s disturbed and the tunnel has formed so that the excavation is safe and controlled. The calculation of induced stresses distribution can be carried out by using analytical and numerical methods. In this research, induced stresses calculations were conducted for shallow tunnel. The shallow tunnel was located in the depth of less than twenty times the radius of the tunnel. The induced stresses analysed were tangential and radial stresses in the sidewall and roof of the tunnel. The results of calculations using analytical methods are compared with numerical methods and then the results are analysed to produce the most suitable method used in shallow tunnels. Analytical methods and numerical methods have different calculation principles, with these differences there will be the possibility of differences in the results of calculations. It was revealed that the average differences between analytical and numerical methods are significantly high in the tunnel roof and very small in the tunnel sidewall. In the roof the differences are 57.41% for radial stress and 45.12% for tangential stress. In the sidewall the differences are 2.75% for radial stress and 1.41% for tangential stress.