Stability of Tunnel Anchorage of Long-span Suspension Bridge in Fractured Rock Interlayer
The stability of tunnel anchorage is a crucial factor in ensuring the safe operation of suspension bridges,as it forms an integral component of the structure.To investigate the load response behavior of tunnel anchorage in fractured rock interlayers of long-span suspension bridges,we have developed a three-dimensional numerical model.This model allows for a comprehensive evaluation of the stability of the tunnel anchorage,demonstrating its suitabil-ity and safety within fractured rock interlayers.Our findings highlight the significant impact of fractured rock inter-layers on the deformation of tunnel anchorage.Specifically,the displacement distribution curve of the rear anchor face and surrounding rock exhibits a distinct hump shape,with greater displacement on the left while smaller dis-placement on the right.Additionally,the interface friction resistance of the anchorage experiences abrupt changes within the fractured rock interlayer region.The failure of the anchorage-rock system commences from the vault area within the fractured rock interlayer,gradually propagating towards the arch waist and bottom until the plastic zone of the anchorage-rock interface is connected.Shear failure in the contact zone between anchorage and rock characteri-zes the failure mode.The bearing capacity of the tunnel anchorage is governed by the tensile failure of the steel bun-dles,with the comprehensive ultimate bearing capacity reaching 2.3 times the designed main cable force.Overall,the tunnel anchorage demonstrates favorable stability and applicability within fractured rock interlayers.
tunnel anchoragefractured rock masslarge-span suspension bridgestability analysisnumerical simulation
万方数据
维普
