Research on the Design of Urban Road Underpass Beneath the Beijing-Shanghai High-speed Railway
To investigate the impact of urban road underpasses on existing high-speed railway,this paper employed the finite element software simulation analysis.Through a comprehensive evaluation of road design schemes,pipeline layouts,and current geological conditions,specialized design proposals were formulated,encompassing aspects such as the installation of crash barriers,foundation reinforcement,pipeline laying,and monitoring measures.The calculation results indicate that,the maximum lateral displacement of bridge piers induced by road construction is 0.38 mm,the maximum longitudinal displacement is 0.167 mm,and the maximum vertical settlement is 0.77 mm.Furthermore,the maximum increase in axial force of bridge pile foundations is 28.4 kN.Both the displacement and axial force changes of pile foundations fall within safe limits.The analysis of pier collision resistance verifies the effectiveness of the crash barriers,and the impact of post-construction road settlement on high-speed railway bridge piles is significantly reduced.Consequently,it is demonstrated that the proposed railway-related specialized scheme can effectively mitigate the construction's influence on existing high-speed railway bridge piles,thereby ensuring railway safety.
high-speed railwayroad underpassmonitoring and measurementpost-construction settlementdisplacement contour mappile foundation axial force
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