Abstract
Existing tunnels are typically distorted when excavating an adjacent tunnel pathway, affecting serviceability and safety. To explore the vertical displacement of adjacent tunnels, a simplified calculation method is proposed in this paper. Firstly, the typical displacement mode of a tunnel under excavation is analyzed. To find the principal factors, the importance of factors are ranked by the random forest algorithm based on collected history cases. By statistically analyzing the principle factors, a semi-empirical formula that is relatively simple and convenient for engineering practitioners is proposed. It can be directly used to predict the maximum vertical displacement of a tunnel due to adjacent excavation. The accuracy and applicability of the proposed empirical formula is verified by comparison to field monitoring data of several project cases previously published. Based on the proposed formula, the range of effect of excavation on the tunnel is analyzed, and the results can provide theoretical guidance for similar projects.
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