Influence of Construction Method on Interaction of Surrounding Rock Structure of Loess Tunnel

Research purposes: Because of the characteristics of loess itself, the phenomenon of large deformation of surrounding rock and complex stress of supporting structure often occurs in the construction of loess tunnel. Therefore, the partial excavation method is generally used in the construction of loess tunnels. In order to find out the influence of different partial excavation methods on the interaction of loess tunnel surrounding rock structure, a water-rich loess tunnel is taken as the engineering background. The finite element software Midas GTS is used to simulate the CRD method, CD method and three-stage seven-step excavation method respectively. The displacement, stress and elastic reaction coefficient k of surrounding rock of three construction methods are analyzed and compared, and the numerical calculation results are verified through measured data and existing theories. Research conclusions: (1) Different construction methods have certain influence on the displacement, stress and elastic reaction coefficient k of surrounding rock of water-rich loess tunnel. (2) The rationality of the numerical simulation results is verified by the measured data and the existing theory, Therefore, the value of elastic reaction coefficient k of surrounding rock in Table 2, it can provide reference for the design and construction of similar projects in the future. (3) The research results are helpful to understand the characteristics of the surrounding rock structural interaction of water-rich loess tunnel, and it can be applied to the related fields of calculation and analysis of water-rich loess tunnel. © 2023 Editorial Department of Journal of Railway Engineering Society. All rights reserved.