Numerical Simulation of Bearing Characteristics of Composite Lining in Hydraulic Tunnels
LING Xiaokang
YANG Xiurong
Abstract：To investigate the bearing characteristics of primary support and secondary lining within a tunnel composite lining system,a three-dimensional finite element numerical simulation was conducted on a Class IV surrounding rock section of a hydraulic tunnel.The mechanical characteristics of the secondary lining under different reserved deformation and initial support conditions were systematically studied.Results indicated that:After setting reserved deformation,more than 75%of the surrounding rock pressure was released,demonstrating that reserved deformation effectively alleviated surrounding rock pressure and significantly reduced the load on the secondary lining structure.Under the condition of considering reserved deformation and timely installation of initial support,the maximum horizontal and vertical displacements of the surrounding rock were 1.09 mm and 3.53 mm,respectively,indicating the tunnel had basically reached a stable state.Based on the tunnel′s stability and finite element analysis results,a reinforcement scheme for the secondary lining was determined.Compared with scenarios without reserved deformation,the reinforcement area at different control sections of the secondary lining could be reduced by 23.7%to 58.8%.These findings provide a reference for the optimal design of composite lining structures.
Keywords：tunnel engineeringcomposite liningsurrounding rock pressurenumerical simulationlining reinforcement
Publication Date：2026-02-20
Online Publishing Date：2026-03-27(First online date of this platform, not the publication date of the document)
Pages：6( 77-82 )