高速铁路桥梁桩基础竖向动荷载测试
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摘要
高速列车在桥梁墩台基础上产生的动荷载是计算桩基础累积沉降的重要参数。系统地测试了不同车速和车型在桥墩不同部位引起的动位移、加速度及墩身动应变,得到了不同跨度桥梁基础的动荷载参数。结果表明:桥墩动力响应(动位移和加速度)从梁端、墩顶到承台顶衰减显著。动位移与轴重、基础与地基土的整体刚度密切相关。桥梁支座具有降低加速度的作用。桥跨长度越长,动荷载越大,动荷载幅值约为动荷载峰值的20%~30%。动荷载可以用正弦函数模拟,频率与列车行驶速度和车厢长度有关。上述结论可为高速铁路桥墩基础的设计和计算作为参考。
The high-speed train-induced dynamic loads on bridge pile foundations are very important parameters to compute the cumulative settlements of pile foundations.Dynamic displacements,accelerations and strains on piers induced by different speeds and typies trains were measured in field to obtain the dynamic loading parameters.The results indicate that:the dynamic response of piers(dynamic displacements and accelerations)decrease from beam ends,pier tops to pile caps.Vertical dynamic displacements are related to the axle loads and the whole stiffness of pile foundations and soils.Supports have important function in decreasing the accelerations.The longer the bridge spans are,the larger the dynamic loads are.The amplitudes of dynamic loads are about 20%-30% of the peaks of dynamic loads.The train-induced dynamic loads can be simulated by sine functions.Frequencies are related to the speed of train and the length of carriages.The results can provide reference for designing the pile foundations supporting high-speed railway.
The high-speed train-induced dynamic loads on bridge pile foundations are very important parameters to compute the cumulative settlements of pile foundations.Dynamic displacements,accelerations and strains on piers induced by different speeds and typies trains were measured in field to obtain the dynamic loading parameters.The results indicate that:the dynamic response of piers(dynamic displacements and accelerations)decrease from beam ends,pier tops to pile caps.Vertical dynamic displacements are related to the axle loads and the whole stiffness of pile foundations and soils.Supports have important function in decreasing the accelerations.The longer the bridge spans are,the larger the dynamic loads are.The amplitudes of dynamic loads are about 20%-30% of the peaks of dynamic loads.The train-induced dynamic loads can be simulated by sine functions.Frequencies are related to the speed of train and the length of carriages.The results can provide reference for designing the pile foundations supporting high-speed railway.
引文
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[15]FLEMING K,WENTMAN A,RANDOLPH M,et al.Piling Engineering[M].3rd ed.London and New York:Taylor&Francis,2009:181-195.
[16]国家铁路局.TB 10002—2017铁路桥涵设计规范[S].北京:中国铁道出版社,2017.
[17]王智猛,蒋关鲁,魏永幸,等.高速铁路基床循环加载试验研究[J].岩土力学,2010,31(3):760-764.WANG Zhimeng,JIANG Guanlu,WEI Yongxing,et al.Experimental Study of Cyclic Loading for Subgrade Bed of High Speed Railway[J].Rock and Soil Mechanics,2010,31(3):760-764.
[18]LIU Jiankun,XIAO Junhua.Experimental Study on the Stability of Railroad Silt Subgrade with Increasing Train Speed[J].Journal of Geotechnical and Geoenvironmental Engineering,2010,136(6):833-841.
[19]CALCADA R.Dynamic Effects Induced by High Speed Traffic on Rail Bridges[R].Florianópolis:2011.
[20]MICHELE A,DONATO C,MAURIZIO D,et al.Parametrical Analysis of the Railways Dynamic Response at High Speed Moving Loads[J].Journal of Modern Transportation,2013,21(3):169-181.
[21]JU S H.3D Analysis of High-speed Trains Moving on Bridges with Foundation Settlements[J].Archive of Applied Mechanics,2013,83(2):281-291.
[2]铁道科学研究院高速铁路技术研究总体组.高速铁路技术[M].北京:中国铁道出版社,2005.
[3]YANG Qi,LENG Wumin,ZHANG Sheng,et al.Longterm Settlement Prediction of High-speed Railway Bridge Pile Foundation[J].Journal of Central South University,2014,21(6):2415-2424.
[4]FENG Shengyang,WEI Limin,HE Chongyang,et al.A Computational Method for Post-construction Settlement of High-speed Railway Bridge Pile Foundation Considering Soil Creep Effect[J].Journal of Central South University,2014,21(7):2921-2927.
[5]ZHOU Shunhua,WANG Changdan,WANG Binglong.Analysis on Settlement Controlling Parameters in Rigid Pile Composite Foundation in High Speed Railway[C]//PENG Qiyuan,WANG K C P,QIU Yanjun,et al.International Conference on Transportation Engineering.New York:American Society of Civil Engineers(ASCE),2011:2008-2013.
[6]MA Jianlin,HUSSEIN Yousif Aziz,SU Chunhui,et al.Settlement Prediction and Behaviour of Pile Foundations in Deep Clayey Soil Deposits[J].Journal of Central South University,2014,21(4):1554-1564.
[7]魏丽敏,刘御刚,冯胜洋.抽降水引起的桥梁桩基础沉降计算[J].水文地质工程地质,2014,41(2):44-49.WEI Limin,LIU Yugang,FENG Shengyang.Settlement Calculation of Bridge Pile Foundation Caused by Dewatering[J].Hydrogeology and Engineering Geology,2014,41(2):44-49.
[8]冷伍明,何群,徐林荣,等.铁路桥梁群桩基础桥墩自振频率计算分析和应用研究[J].铁道学报,1999,21(4):72-76.LENG Wuming,HE Qun,XU Linrong,et al.Study on Natural Frequence of Bridge Pier Supported by Group Pile Foundation[J].Journal of the China Railway Society,1999,21(4):72-76.
[9]毛坚强,蒋媛.基于单桩静载试验结果的群桩基础沉降计算方法[J].铁道学报,2017,39(1):97-103.MAO Jianqiang,JIANG Yuan.Settlement Calculation of Pile Group Foundation Based on Results of Vertical Static Load Test on Single Pile[J].Journal of the China Railway Society,2017,39(1):97-103.
[10]国家铁路局.TB 10621—2014高速铁路设计规范[S].北京:中国铁道出版社,2014.
[11]DAS B M.Advanced Soil Mechanics[M].3rd ed.London and New York:Taylor&Francis,2007:477-525.
[12]HSEYIN Y,HAYREDDIN E.Settlements under Consecutive Series of Cyclic Loading[J].Soil Dynamics and Earthquake Engineering,2007,27(6):577-585.
[13]POULOS H G.Pile Group Settlement Estimation-Research to Practice[C]//GeoShanghai International Conference 2006.Foundation Analysis and Design:Innovative Methods.New York:Geotechnical Special Publication,2006:1-22.
[14]FELLENIUS B H.Unified Design of Piled Foundations with Emphasis on Settlement Analysis[C]//DIMAGGIO J A,HUSSEIN M H.Geo-Institute Geo-TRANS Conference.Los Angeles:Geotechnical Special Publication,2004:253-275.
[15]FLEMING K,WENTMAN A,RANDOLPH M,et al.Piling Engineering[M].3rd ed.London and New York:Taylor&Francis,2009:181-195.
[16]国家铁路局.TB 10002—2017铁路桥涵设计规范[S].北京:中国铁道出版社,2017.
[17]王智猛,蒋关鲁,魏永幸,等.高速铁路基床循环加载试验研究[J].岩土力学,2010,31(3):760-764.WANG Zhimeng,JIANG Guanlu,WEI Yongxing,et al.Experimental Study of Cyclic Loading for Subgrade Bed of High Speed Railway[J].Rock and Soil Mechanics,2010,31(3):760-764.
[18]LIU Jiankun,XIAO Junhua.Experimental Study on the Stability of Railroad Silt Subgrade with Increasing Train Speed[J].Journal of Geotechnical and Geoenvironmental Engineering,2010,136(6):833-841.
[19]CALCADA R.Dynamic Effects Induced by High Speed Traffic on Rail Bridges[R].Florianópolis:2011.
[20]MICHELE A,DONATO C,MAURIZIO D,et al.Parametrical Analysis of the Railways Dynamic Response at High Speed Moving Loads[J].Journal of Modern Transportation,2013,21(3):169-181.
[21]JU S H.3D Analysis of High-speed Trains Moving on Bridges with Foundation Settlements[J].Archive of Applied Mechanics,2013,83(2):281-291.