Analysis of Factors Influencing the Load-structural Response of Tunnel in Rock Environment
To investigate the impact of different factors on the structural response of segment loads in rock tunnel structures,this study employs a load structure theory model to obtain analytical solutions for the external load,internal force distribution,and displacement response of rock tunnel structures.Taking into account the structural characteristics of rock tunnel segment loads,this study investigates the impact of seven key influencing factors:overlying strata load,water head height,rock lateral pressure coefficient,equivalent bending stiffness coefficient,tunnel diameter,segment thickness,and concrete grade on the structural response of segment loads.The findings are validated through on-site monitoring tests conducted at the Jinxiu Tunnel in Chengdu.The research reveals that reducing overlying strata load and the coefficient of lateral pressure increases internal forces and displacements of tunnel segments.Increasing hydraulic head height has minimal effect on internal forces but significantly raises axial force levels.Increasing the equivalent flexural stiffness coefficient does not affect internal forces but slightly reduces radial displacement.A slight increase in segment bending moment,axial force,and radial displacement is observed with an increase in tunnel diameter.Segment thickness has a minor impact on internal forces,with thicker segments causing a slight increase in radial displacement.Changes in concrete grade have minimal effect on the tunnel's structural response to load.Comparison between field monitoring results and calculated model results exhibits similar patterns in the structural response under load,indicating a highly accurate analysis method proposed in the study.
tunnel engineeringrock environmenton site monitoringload-structural response of tunnelfactor analysis
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维普
