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Simplified method for evaluating mechanical interactions between tunnel and soil due to adjacent excavation
Highlights Tunnel and excavation model is proposed, considering spatial effects. Influence of bottom and surrounding walls of excavation is estimated. Effects of tunnel-excavation relative position are considered. Interaction between lateral soil and tunnel is calculated.
Abstract Excavations disrupt the original stress field and may have harmful effects on in-service shield tunnels. Therefore, a rational assessment of the responses of existing shield tunnels to construction of excavation is a significant challenge. Current analytical methods for evaluating the mechanical interactions between the excavation and the tunnel generally utilize Winkler’s model, which considers only the plane strain and ignores the spatial effect between the tunnel and the excavation. In this analysis, a new elastic analytical method that uses the Pasternak elastic model is presented to simulate mechanical interactions between the lateral soil and the tunnel when subjected to the unloading pressure of the bottom and surrounding walls of the excavation. The space-effect of excavation and spatial effects of tunnel-soil interaction are both under consideration. The responses of the tunnel to the construction of excavation were assessed by a two-stage analysis method. First, the imposed unloading load at the tunnel location was calculated based on elastic solutions. Second, vertical displacement of the tunnel caused by the corresponding load was evaluated using the finite difference method. In addition to the proposed analytical approach, six analytical approaches were developed for the elastic model. The applicability of the proposed method was validated by comparisons with numerical simulations and field monitoring data. Furthermore, the predictions of the six analytical approaches for the elastic model were compared with those of the proposed method.
Simplified method for evaluating mechanical interactions between tunnel and soil due to adjacent excavation
Highlights Tunnel and excavation model is proposed, considering spatial effects. Influence of bottom and surrounding walls of excavation is estimated. Effects of tunnel-excavation relative position are considered. Interaction between lateral soil and tunnel is calculated.
Abstract Excavations disrupt the original stress field and may have harmful effects on in-service shield tunnels. Therefore, a rational assessment of the responses of existing shield tunnels to construction of excavation is a significant challenge. Current analytical methods for evaluating the mechanical interactions between the excavation and the tunnel generally utilize Winkler’s model, which considers only the plane strain and ignores the spatial effect between the tunnel and the excavation. In this analysis, a new elastic analytical method that uses the Pasternak elastic model is presented to simulate mechanical interactions between the lateral soil and the tunnel when subjected to the unloading pressure of the bottom and surrounding walls of the excavation. The space-effect of excavation and spatial effects of tunnel-soil interaction are both under consideration. The responses of the tunnel to the construction of excavation were assessed by a two-stage analysis method. First, the imposed unloading load at the tunnel location was calculated based on elastic solutions. Second, vertical displacement of the tunnel caused by the corresponding load was evaluated using the finite difference method. In addition to the proposed analytical approach, six analytical approaches were developed for the elastic model. The applicability of the proposed method was validated by comparisons with numerical simulations and field monitoring data. Furthermore, the predictions of the six analytical approaches for the elastic model were compared with those of the proposed method.
Simplified method for evaluating mechanical interactions between tunnel and soil due to adjacent excavation
Wei, Zheng (author)
2023-05-01
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2017
| British Library Online Contents | 2017