A case study of ground control mechanisms of EPB shield tunnelling in soft clay

This paper presents the observed ground surface movement and the corresponding construction details during advance of an Earth Pressure Balanced (EPB) shield driven tunnel of the Shanghai Metro Tunnel-Line 2 in China. Based on the field results, the influences of tunnel construction control processes on the resulting ground movement are interpreted and discussed in this paper. Correlation between the ground surface settlement is developed taking into consideration of the control factors in the excavation process as well as the grouting process.