首页|基于Kerr地基模型的覆土荷载引起既有装配式地铁车站沉降分析

基于Kerr地基模型的覆土荷载引起既有装配式地铁车站沉降分析

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分步覆土回填会引起装配式结构纵向不均匀沉降,但已有的纵向变形计算模型往往忽略由地基自身沉降引起的装配式衬砌变形.鉴于此,基于纵向等效连续梁理论对Kerr地基上Timoshenko梁模型进行优化,建立可考虑地基自身沉降和土体剪切作用的装配式地铁车站纵向变形计算模型,并与现场实测结果进行对比验证.研究结果表明:与Euler-Winkler模型、Timoshenko-Pasternak模型理论计算结果相比,所提的理论方法在保证计算精度的同时,能够揭示地基沉降引起的装配式结构纵向变形特征;所提方法能有效揭示监测环竖向沉降变化趋势,预测的纵向沉降值与实测数据吻合良好,误差仅为0.3％;在覆土荷载和地基沉降等综合因素影响下,装配式结构发生屈曲并形成新的稳定结构,该现象可解释装配式结构中环段与接头变形不连续现象.
Settlement Analysis of Existing Prefabricated Subway Stations Induced by Overburden Backfill Load Based on Kerr Foundation Model
The sequential soil backfilling process can lead to longitudinal uneven settlement in prefabricated struc-tures.However,existing longitudinal deformation models often neglect the deformation of prefabricated linings caused by foundation settlement.To address this,an optimized longitudinal deformation model for prefabricated sub-way stations is established based on an improved Timoshenko beam model on a Kerr foundation,considering founda-tion settlement and soil shear effects.The model is validated through comparisons with field measurements.The study shows that,compared to theoretical results from the Euler-Winkler model and the Timoshenko-Pasternak model,the proposed method not only ensures calculation accuracy but also reveals the characteristics of longitudinal deformation induced by foundation settlement.The method effectively captures the trend of vertical settlement at monitoring rings,with predicted longitudinal settlement values showing good agreement with measured data,having an error of only 0.3％.Under the combined effects of overburden load and foundation settlement,buckling occurs in the prefabricated structure,forming a new stable structure,which explains the discontinuous deformation between rings and joints in prefabricated structures.

Prefabricated subway stationLongitudinal equivalent continuous modelFoundation settlementShear effectLongitudinal deformation

刘朝阳、蒋凯、梁禹

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中铁十四局集团有限公司,济南 250000

中山大学·深圳航空航天学院,深圳 518107

中山大学土木工程学院,珠海 519082

南方海洋科学与工程广东省实验室(珠海),珠海 519082

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装配式地铁车站 纵向等效连续化模型 地基沉降 剪切效应 纵向变形

国家自然科学基金深圳市自然科学基金可持续发展科技专项广东省基础与应用基础研究基金广东省基础与应用基础研究基金

52378427KCXFZ202012211732070202023A15150302582024A1515012623

2024

10.13807/j.cnki.mtt.2024.05.008

现代隧道技术
中铁西南科学研究院有限公司 中国土木工程学会隧道及地下工程分会

现代隧道技术

CSTPCD北大核心
影响因子：1.493
ISSN：1009-6582
年,卷(期)：2024.61(5)