Evaluation of a tunnel in Yunnan using CRD construction method

Abstract

According to the surrounding rock conditions of Re Shuitang Tunnel NO.2, it is analyzed whether the CRD method is suitable for such surrounding rock conditions. By comparing and analyzing the distribution of plastic zone of surrounding rock during construction and the displacement deformation of tunnel monitoring point, the tunnel is constructed. The plastic zone of the middle arch and the arch is obviously changed, and should be reinforced. The settlement of the right vault and the side wall is larger than the left side, which is about 19.8% and 21.9%. According to the analysis results, the vault should be reinforced in advance during tunnel construction to prevent collapse and ensure construction safety, and provide reference for future construction.

The effect of CRD method and auxiliary construction on surface settlement in shallow-buried tunnels

“…Similarly, the change laws of the surrounding rock stress, strain, and displacement fields are analyzed, and the characteristics of the support force state of different excavation methods and step-arch tunnels are investigated (Li et al, 2014). The applicability of the cross diaphragm (CRD) method to the type of surrounding rock is analyzed, and the reinforcement measures for the tunnel vault based on the analysis results are proposed (Duan et al, 2019). Controlling the critical construction steps of the CRD method plays a critical role in ensuring efficient construction and safety (Wang et al, 2020).…”