Abstract:

The analysis of influencing factors of ground surface settlement induced by shield tunneling in soft ground and the accurate prediction of settlement can provide theory basis for shield tunneling parameter optimization and settlement control. The theoretical analysis method and threedimensional numerical simulation method are adopted for studying shield boring with a low speed (or shield stop). The ground settlement induced by shield tunneling is calculated by the abovementioned two methods, and is compared with the measured settlement data of shield stop section of Xingengjie StationTianbaolu Station section of Ninghe Intercity Railway in Nanjing. The influencing factors of ground settlement induced by shield tunneling are analyzed in terms of settlement value differences. The analytical results show that the shield tunneling parameters, excess pore water pressure dissipation and ground loss are the main influencing factors of ground surface settlement. The ground settlement induced by shield tunneling can be minimized by means of construction parameters optimization and economical and reliable advanced foundation treatment.

Key words: shield, slow advancing, shield stop, theoretical analytical solution, numerical simulation, settlement control technology