Dynamic response analysis of a roadway surrounding rock interacted with a single-column energy-absorbing support

TANG Zhi; CHENG Shiyang

doi:10.19956/j.cnki.ncist.2026.01.019

Abstract：To investigate the synergistic response mechanism between single - column energy - absorbing supports and the surrounding rock of tunnels under dynamic impact loads,ABAQUS numerical simulation was employed.By analyzing mechanical parameters such as surrounding rock stress,deformation,plastic strain,and support deformation,this study examines the dynamic response characteristics of energy-absorbing tunnel sup-ports under both vertical and lateral impacts.The results indicate that under vertical impact,as impact energy increases,indicators such as tunnel rock stress,roof settlement,floor heave,and lateral contraction all exhibit an upward trend.This increase readily triggers destructive phenomena including floor heave,sidewall deforma-tion,and pillar drilling through the base.Compared to single-pillar support,energy-absorbing roadway supports exhibit similar peak rock mass stresses but reduced stress concentration zones.Roof settlement,floor heave,and lateral contraction all decrease to varying degrees.Additionally,the supports and roadway demon-strate synergistic effects in both lateral and vertical displacement.The plastic deformation of the tunnel rock mass follows an"A"distribution,primarily concentrated at the junction between the tunnel sidewall and roof,as well as within the sidewall itself.Under lateral impact,individual pillars shift leftward,undergoing lateral ben-ding deformation that significantly reduces their load-bearing capacity.The energy-absorbing support effec-tively restricts lateral tunnel displacement,significantly constraining roof-floor displacement and sidewall com-pression.The synergistic interaction between the lateral support of the energy-absorbing tunnel support and the energy-absorbing impact absorber markedly improves the uneven loading issue of individual pillars.These findings provide a reference for controlling the tunnel rock mass under dynamic loading conditions.