Proposing an Analytical Equation to Evaluate the Maximum Surface Settlement Due to TBM Construction Based on the Monitoring Data from Ho Chi Minh City Metro Construction

The most concerns during the underground metro construction by TBM method is the ground movement and surface settlement which may cause the damages to the surrounded buildings. The maximum surface settlement should then be monitored and controlled by setting the different alarming levels. The prediction of the maximum surface settlement is in the critical important. Analytical or numerical method could be used for the evaluation of the value. In this paper, throughout the acquired monitoring data of the maximum surface settlement during the construction of the Ben Thanh-Suoi Tien, underground metro section of Ho Chi Minh City, an analytical prediction equation was proposed. A very good correlation between the calculation results using this new equation and the site monitoring data proves the efficiency of the mathematical model for future prediction in very similar condition. The influences of different operation parameters are then discussed.