不均匀沉降对大跨连续梁及轨道结构影响分析

Effects Analysis of Differential Settlementon on Long-span Continuous Bridge and Ballastless Track Structure

研究目的:本文结合某高速铁路大跨度无砟轨道桥梁不均匀沉降工程实例,分析墩台发生不均匀沉降工况下,桥梁结构及桥上无砟轨道受力情况,并对结构安全性和适应性进行综合分析,最后根据沉降值范围,提出相应的处理方案及建议。论文旨在通过针对性研究,对今后大跨连续梁不均匀沉降的整治处理提供参考。研究结论:通过计算分析得出:(1)大跨连续梁不均匀沉降值超过现行设计规范一定范围时,对墩台受力影响较小,对连续梁主梁及轨道受力影响可控;(2)现行规范应适当放宽对大跨连续梁不均匀沉降的限值,有利于在设计阶段从源头上既保证结构安全又节约建设成本;(3)对较大的不均匀沉降应及时采取措施进行综合整治;(4)该研究成果可应用于铁路大跨连续梁因软土地基、地下水位变化等因素引起的墩台不均匀沉降整治。

Research purposes： This paper, associated with a certain engineering project of differential settlement on ballastless track long- span bridge in high -speed railway, analyzes the bridge structure and ballastless track stress on bridge under operation condition with diverse differential settlement value. Through comprehensive analysis of structure safety and adaptability, the relevant solutions and suggestions are proposed. Through targeted research, this paper is aimed at providing the reference for remediation processing of large - span continuous beam differential settlement in the future. Research conclusions：When long- span continuous beam differential settlement value is more than a certain range of the current design code, the stress influence on the pier is less, the effect on continuous beam girder and rail is controllable. The current code limit value for long - span continuous beam differential settlement should be appropriate to relax, to guarantee the safety of the structure and save the construction cost. At the same time, the larger differential settlement should be taken timely measures to carry out comprehensive improvement. The research results can be applied to differential settlement remediation of the railway long - span continuous beam pier caused by soft soil, groundwater level changes and other factors.