Research on the Countermeasures for High Speed Railway Subgrade Small Angle Crossing Shallow Buried Tunnel of Existing Railway
Research purposes:High speed railways cross shallow buried sections of existing railway tunnels at small angles in the form of subgrade.In order to avoid adverse effects on existing railway tunnels caused by new railway subgrade loads,mechanical vibrations during construction,and later operation,relevant research is conducted to evaluate the degree of impact,optimize the subgrade structure,propose operation monitoring plans,and provide guidance for design and construction,which is of great significance for ensuring the safety of high-speed railway and existing railway operations.Research conclusions:(1)The research proposes the impact assessment method,control indicators,and evaluation parameters for high-speed railway crossing existing railway tunnels.(2)Conducting an impact assessment of conventional subgrade design schemes,it was found that the existing railway tunnel structure is approaching the limit level of stress and has insufficient safety reserves.(3)The research proposes the design scheme and static compaction measures for pouring lightweight concrete into U-shaped grooves for lightweight structures.Compared with conventional subgrade design schemes,the optimization amplitude of the stress impact on the lining of existing railway tunnels can reach 30％ to 50％ .(4)A total station automation monitoring scheme is proposed,including monitoring scope,monitoring content,monitoring layout requirements,monitoring frequency,monitoring warning threshold,etc.(5)The research results can provide reference for other newly-built railway projects crossing existing railways.
high-speed railway subgradecrossing existing railways at a small angleshallow buried tunnelsengineering countermeasures
万方数据
维普
