5/2/2023 0 Comments Tunnel face support xlsThe results showed that such ratio should be set to 0.6–0.7, which implies that the change in the support pressure cannot be less than 0.6 times of the true strata stress before excavation. The values of the minimum limit support pressure ratio λ min of the tunnel face were suggested. The present method was compared with the classical limit-equilibrium calculation methods to predict the active limit support pressure in the tunnel face. A simplified limit-equilibrium method was developed in combination with the limit state in the PFC model. Both the stress distribution in the ground and the settlement under different support states were analyzed. In this study, five special geological sections were selected based on the shield tunnel project between Wangfujing and Qianmen Stations of Beijing Metro Line 8 to evaluate the different support pressure ratios λ by using the particle flow code (PFC). In tunneling, the tunnel support pressure is currently being determined by empirical methods. Although many calculation methods for tunnel face support pressure have been proposed, they are difficult to use in practical applications.
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