基于滑坡破坏模式的桥台位移耦合计算
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摘要
地震作用下桥台永久变形大小是评价桥梁基础地震稳定性的一个重要指标。首先分析地震下桥台破坏特点,提出简化桥台滑坡破坏模式,在此基础上考虑土体强度衰减效应对桥台稳定性的影响,将桥台-土体地震动力响应分析与Newmark有限滑移计算方法相耦合,提出桥台滑移计算公式。然后将计算结果与R-E方法进行对比,结果表明:提出的计算模型能较好地反映桥台-土体的破坏特点,较充分地考虑地基土软化对桥台的稳定作用,以及在一定程度上考虑桥台-土体的地震动力响应特性;土体强度衰减对桥台-滑坡体的稳定性影响很大,在计算中不可忽视。
The earthquake-induced permanent displacement is an important index to evaluate the stability of bridge abutments.Firstly,the failure mechanism of abutment-soil during the quake was analyzed and its failure modes were presented.Considering the effects of soil's strength degradation on the stability of bridge abutments based on the failure modes proposed,a coupling analytical method was presented to calculate the seismic displacement combined seismic response analytical method of abutment-soil and Newmark's finite displacement theory.Then,comparisons were made between R-E method and that proposed in this paper.The results show that the calculation model proposed seems reasonable to reflect failure mechanisms of the abutment-soil system.It is capable of considering the significant effects of foundation softening on the stability of bridge abutments and of considering the dynamic response characteristics for abutment-soil system.The effects of soil's strength degradation on the stability of abutment-slope are so significant that they can't be negligible.
The earthquake-induced permanent displacement is an important index to evaluate the stability of bridge abutments.Firstly,the failure mechanism of abutment-soil during the quake was analyzed and its failure modes were presented.Considering the effects of soil's strength degradation on the stability of bridge abutments based on the failure modes proposed,a coupling analytical method was presented to calculate the seismic displacement combined seismic response analytical method of abutment-soil and Newmark's finite displacement theory.Then,comparisons were made between R-E method and that proposed in this paper.The results show that the calculation model proposed seems reasonable to reflect failure mechanisms of the abutment-soil system.It is capable of considering the significant effects of foundation softening on the stability of bridge abutments and of considering the dynamic response characteristics for abutment-soil system.The effects of soil's strength degradation on the stability of abutment-slope are so significant that they can't be negligible.
引文
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[3]Richards R,Elms D G.Seismic behavior of gravity retainingwalls[J].Journal of the Geotechnical Engineering Division,ASCE,1979,105(4):449-464
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[7]Zeng X,Steedman R S.Rotating block method for seismicdisplacement of gravity retaining walls[J].Journal ofGeotechnical and Geoenvironmental Engineering,ASCE,2000,126(8):709-717
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[11]Knappett J A,Haigh S K,Madabhushi S P G.Mechanismsof failure for shallow foundations under earthquake loading[J].Soil Dynamics and Earthquake Engineering,2006,26(2/3/4):91-102
[12]Richards R,Elms D G,Budhu M.Seismic bearing capacityand settlement of foundations[J].Journal of Geotechnicaland Geoonvironmental Engineering,ASCE,1993,119(4):662-674
[13]张其一.复合加载模式下地基失效机制研究[J].岩土力学,2009,30(10):2940-2944(Zhang Qiyi.Study offailure patterns of foundation under combined loading[J].Rock and Soil Mechanics,2009,30(10):2940-2944(inChinese))
[14]何度心.桥台抗震设计理论[J].世界地震工程,1991(3):1-15(He Duxin.Seismic design theory of bridgeabutment[J].World Earthquake Engineering,1991(3):1-15(in Chinese))
[15]钱家欢,殷宗泽.土工原理与计算[M].北京:中国水利水电出版社,2006
[16]Yulman M,Shamsher P,Thomas F.Geotechnical seismicevaluation of bridge abutments in South-east Missour[iC]//Pacific Conference on Earthquake Engineering.NewZealand,2003:1-11
[17]Yasuhara K.Postcyclic undrained strength for cohesive soils[J].Journal of Geotechnical Engineering,ASCE,1994,120(11):1961-1979
[18]杨庆,王猛,栾茂田,等.非饱和粉土静、动强度对比试验研究[J].岩土力学,2010,31(1):71-80(YangQing,Wang Meng,Luan Maotian,et al.Experimentalresearch of correlation on static and dynamic strength ofunsaturated silty clay[J].Rock and Soil Mechanics,2010,31(1):71-80(in Chinese))
[19]Seed H B,Silver M L.Settlement of dry sands duringearthquakes[J].Journal of Soil Mechanics and Foundations,ASCE,1972,98(4):381-397
[2]陈国兴.岩土地震工程学[M].北京:科学出版社,2007
[3]Richards R,Elms D G.Seismic behavior of gravity retainingwalls[J].Journal of the Geotechnical Engineering Division,ASCE,1979,105(4):449-464
[4]Wong C P.Seismic analysis and improved seismic designprocedure for gravity retaining walls[D].London:CambridgeUniversity,1982
[5]Siddharthan R,Gowda P K,Norris G M.Displacementbased design of retaining walls[C]//Proceeding of 2ndInternational Conference on Recent Advances inGeotechnical Earthquake Engineering and Soil Dynamics.St.Louis,1991:657-661
[6]Siddharthan R,Samia A,Gary M N.Simple rigid plasticmodel for seismic tilting of rigid walls[J].Journal ofStructural Engineering,ASCE,1992,118(2):469-487
[7]Zeng X,Steedman R S.Rotating block method for seismicdisplacement of gravity retaining walls[J].Journal ofGeotechnical and Geoenvironmental Engineering,ASCE,2000,126(8):709-717
[8]Newmark N M.Effects of earthquakes on dams andembankments[J].Geotechnique,1965,15(2):139-160
[9]汪闻韶.在某电厂地基饱和砂性土地震稳定性试验中提出的原理和方法[C]//水利水电科学研究院科学研究论文集(16)北京:水利电力出版社,1984
[10]Seed H B.Consideration in the earthquake resistant designof earth and rockfill dams[J].Geotechnique,1979,29(3):215-263
[11]Knappett J A,Haigh S K,Madabhushi S P G.Mechanismsof failure for shallow foundations under earthquake loading[J].Soil Dynamics and Earthquake Engineering,2006,26(2/3/4):91-102
[12]Richards R,Elms D G,Budhu M.Seismic bearing capacityand settlement of foundations[J].Journal of Geotechnicaland Geoonvironmental Engineering,ASCE,1993,119(4):662-674
[13]张其一.复合加载模式下地基失效机制研究[J].岩土力学,2009,30(10):2940-2944(Zhang Qiyi.Study offailure patterns of foundation under combined loading[J].Rock and Soil Mechanics,2009,30(10):2940-2944(inChinese))
[14]何度心.桥台抗震设计理论[J].世界地震工程,1991(3):1-15(He Duxin.Seismic design theory of bridgeabutment[J].World Earthquake Engineering,1991(3):1-15(in Chinese))
[15]钱家欢,殷宗泽.土工原理与计算[M].北京:中国水利水电出版社,2006
[16]Yulman M,Shamsher P,Thomas F.Geotechnical seismicevaluation of bridge abutments in South-east Missour[iC]//Pacific Conference on Earthquake Engineering.NewZealand,2003:1-11
[17]Yasuhara K.Postcyclic undrained strength for cohesive soils[J].Journal of Geotechnical Engineering,ASCE,1994,120(11):1961-1979
[18]杨庆,王猛,栾茂田,等.非饱和粉土静、动强度对比试验研究[J].岩土力学,2010,31(1):71-80(YangQing,Wang Meng,Luan Maotian,et al.Experimentalresearch of correlation on static and dynamic strength ofunsaturated silty clay[J].Rock and Soil Mechanics,2010,31(1):71-80(in Chinese))
[19]Seed H B,Silver M L.Settlement of dry sands duringearthquakes[J].Journal of Soil Mechanics and Foundations,ASCE,1972,98(4):381-397
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