新建下穿道路对高铁桥梁形位的时变影响

宋旭明; 包世鹏

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铁道工程学报 ›› 2023, Vol. 40 ›› Issue (9) : 38-43.

长大干线：桥梁工程

新建下穿道路对高铁桥梁形位的时变影响

宋旭明, 包世鹏^**

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Time-varying Influence of Newly-built Underpass Road on the Shape and Position of High-speed Railway Bridge

SONG Xuming, BAO Shipeng

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摘要

研究目的：为评估新建工程对高铁桥梁轨道形位的时变影响,以某新建道路下穿高速铁路连续梁桥为背景,建立软土地基-桥梁-轨道一体化时变有限元模型,分析轨道形位、桩基内力和桩侧摩阻力的时变规律,并研究各土体参数对轨道形位的影响程度。
研究结论：(1)高铁桥梁轨道形位变化在8年左右趋于收敛,软土地基的竖向变形受路基堆载影响很大,固结过程中桥墩墩顶的竖向位移增量相对值可达159%,应加强对施工后桥墩位移的监测;(2)路基填筑后桥梁桩基上部出现了负摩阻力,附加轴力在埋深30~40 m位置(中性点)达到最大值;(3)修正剑桥本构中对轨道竖向位移敏感性最大的三个参数为正常固结曲线斜率、临界状态线斜率和屈服面帽子曲度常量,数值计算时应根据土工试验结果对上述参数合理取值;(4)本文研究可为施工完成后高铁轨道形位的后续变化预测提供依据。

Abstract

Research purposes: A time-varying finite element model of soft soil foundation-bridge-track integration was established based on a continuous beam bridge under high-speed railway. The time-varying laws of track shape, pile internal force and pile side friction were analyzed, and the influence degree of soil parameters on track shape and position was studied.
Research conclusions: (1) The change of track shape and position of high-speed railway bridge tends to converge in about 8 years, the vertical deformation of soft soil foundation is greatly affected by subgrade surcharge, and the relative value of vertical displacement increment of pier top during consolidation can reach 159%, so the monitoring of pier displacement after construction should be strengthened. (2) After the subgrade filling, the negative friction appeared on the upper part of the bridge pile foundation, and the additional axial force reached the maximum at the buried depth of 30~40 m (neutral point). (3) The three parameters that are most sensitive to the vertical displacement of the track in the modified Cambridge constitutive model are the slope of the normal consolidation curve, the slope of the critical state line and the curvature constant of the yield surface cap. The above parameters should be reasonably selected according to the results of the geotechnical test. (4) The results of the research could provide construction references for the change of high-speed railway track deformation.

导出引用

宋旭明, 包世鹏. 新建下穿道路对高铁桥梁形位的时变影响[J]. 铁道工程学报, 2023, 40(9): 38-43

SONG Xuming, BAO Shipeng. Time-varying Influence of Newly-built Underpass Road on the Shape and Position of High-speed Railway Bridge[J]. Journal of Railway Engineering Society, 2023, 40(9): 38-43

中图分类号： U24

参考文献

[1] 王景春, 刘旭菲, 侯卫红. 新建桥梁对运营高铁基础变位的影响研究[J]. 铁道工程学报, 2017(7):60-65.Wang Jingchun, Liu Xufei, Hou Weihong. Research on the Influence of Construction of New Bridge on Foundation Displacement of High-speed Railway in Service[J]. Journal of Railway Engineering Society, 2017(7):60-65.
[2] 孙慧君. 软土地区新建公路下穿高铁桥梁安全评估及位移控制研究[D]. 长沙:中南大学, 2020.
Sun Huijun. Research on Safety Assessment and Displacement Control of High-speed Railway Bridges under New Highways in Soft Soil Areas[D]. Changsha:Central South University, 2020.
[3] 唐炫, 魏丽敏, 胡海军. 不同固结度下软土的力学特性[J]. 铁道勘察,2009(4):16-17.
Tang Xuan,Wei Limin,Hu Haijun.Mechanical Properties of Soft Soil with Different Consolidation Degrees[J]. Railway Investigation and Surveying, 2009(4):16-17.
[4] 李佐良, 杨爱武,许再良,等. 不同固结度对软土强度及变形的影响[J]. 中国港湾建设, 2012(2):47-50.
Li Zuoliang, Yang Aiwu, Xu Zailiang,etc. Impact of Different Consolidation Degrees on Strength and Deformation of Soft Soil[J]. China Harbour Engineering, 2012(2):47-50.
[5] 张文俊. 基于修正剑桥模型的刚性桩复合地基固结分析研究[D]. 广州:华南理工大学, 2013.
Zhang Wenjun. Cosolidated Analysis of Rigid Pile Composite Foundation Based on Modified Cam-Clay Model[D]. Guangzhou: South China University of Technology, 2013.
[6] 陈欢. 软土地基上堆载工程对既有高速铁路桥梁桩基影响及其控制技术研究[D]. 南京:东南大学, 2017.
Chen Huan. The Influence of Preloading on Piles of Existing High Speed Railway Bridge in Soft Soil and Control Technologies[D]. Nanjing:Southeast University, 2017.
[7] 翟婉明, 赵春发, 蔡成标. 磁浮列车与轮轨高速列车对线桥动力作用的比较研究[J]. 交通运输工程学报, 2001(1): 7-12.
Zhai Wanming, Zhao Chunfa, Cai Chengbiao. On the Comparison of Dynamic Effects on Bridges of Maglev Trains with High-speed Wheel/Rail Trains[J]. Journal of Traffic and Transportation Engineering, 2001(1):7-12.
[8] 刘文硕, 戴公连. 大跨径无砟连续梁上小阻力扣件的适应性研究[J]. 华中科技大学学报:自然科学版,2013(7): 36-41.
Liu Wenshuo, Dai Gonglian. Adaptability Study on Small Resistance Fasteners on Long-span Continuous Ballastless Bridges[J]. Journal of Huazhong University of Science and Technology:Natural Science Edition, 2013(7): 36-41.