关键词: 位移事故, 数值模拟, 病害成因, 纠偏治理

Abstract:

 For the complexity and uncertainty of analysis process of pier displacement accident, we simulate and analyze the cause of pier displacement accident and its internal mechanism with the impact of surcharges action of recent fill caused lateral displacement of soil pile of a prestressed concrete box girder bridge pier on the force of pile foundation as a subject and the combination of onsite inspection, comprehensive monitoring and theoretical analysis and numerical simulation. We employ pile top push, pier top traction, antislide pile, balance load to conduct rectification and accident management based on hierarchical processing principle and actual situation. Pier deviation therefore returns to the allowable range, and the accident is avoided. We also dynamically monitor the pier, antislide pile and anchor rod in the rectification process. Results show that all displacement indicators satisfy the requirements, so the accident analysis is accurate, and the scheme is reasonable and effective and has better disposition effect. The method provides reference for postsurvey of similar accidents, analysis of accident cause and rectification process.

Key words: displacement accident, causes of disease, numerical simulation, rectifying deviation treatment