Vibration Monitoring and Protection for Ancient Buildings under a Metro Shield
To ensure the safety of ancient buildings during subway shield tunneling,a general technical approach involving initial assessment,reinforcement,construction monitoring,subsequent evaluation,and additional reinforcement has been established.This study built a 1∶3.52 physical model of ancient buildings and conducted shaking table tests to obtain the damping ratio of structures Ansys was used to build a three-dimensional model.Using structural and modal analysis for vulnerable structures for strengthening and prevention,this study provides a reference for the follow-up vibration monitoring and shield construction.The construction parameters were adjusted according to the construction monitoring data in the test area.The results showed that the maximum displacement of the structure was approximately 14.01 mm under static analysis,which verified the validity of the three-dimensional model.The basic frequency of the structural model was 0.590 46 Hz and the most vulnerable position was sandalwood.During shield tunneling,the acceleration of ancient buildings was less than 0.003 m/s2,the vibration frequency was primarily concentrated at 0.6-20.5 Hz,and the vibration frequency was in the normal range.The paper proposes that the overall solution of subway shield tunneling through the ancient buildings involves a uniform driving speed,avoiding the operation peak period,using the grouting reinforcement between the strata in the affected area,supporting the vulnerable structure of the ancient buildings,and adopting a vibration isolation and vibration reduction scheme during the construction.This provides a reference for similar subsequent projects.
urban rail transitmetro shieldpreservation of ancient buildingsvibration monitoringprotection measures
NETL
NSTL
万方数据
