Abstract: To investigate the impact of the excavation uplift effect on the settlement prediction of shallowburied largediameter tunnels, finite element numerical simulation method is used to conduct calculations. The results show that the excavation uplift effect results in the ground settlement is significantly smaller. Based on the settlement monitoring data of the onsite ground surface, the Clough modified formula is introduced to calculate the width coefficient 〖WT５《TNR#I》〗i〖WT５《TNR》〗 of the settlement trough. The Loganathan & Puolos and Celestino formulas are modified and nonlinear fitting analysis is carried out. It is concluded that the formation loss rate 〖WT５《TNR#I》〗V〖WT《TNR》〗l is unknown, and the fitting degree of the modified Loganathan & Puolos formula is the highest, and the fitting degree of the Celestino formulas is the highest for land subsidence based on the formation loss rate 〖WT５《TNR#I》〗V〖WT《TNR》〗l. The correlation between the complete settlement prediction curve drawn by the combined formula and the onsite monitoring data curve reaches 85%, and the trend is basically the same, indicating that the prediction method has a good prediction accuracy.

Key words: shallowburied superlargediameter shield tunnel, Loganathan &, Puolos and Celestino formula modification, nonlinear fitting, settlement prediction