液化型路堤边坡地震安全性分析
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摘要
地震液化型路堤边坡安全性问题涉及岩土工程与工程地震两个学科领域,是边坡工程与砂土液化的交叉课题。路堤边坡在地震时,因基础之下的砂土发生液化现象,会急剧发生地基承载力丧失、液化沉陷、侧向流动、液化喷砂、整体滑动等问题。应用NCEER液化评估方法(SPT)、Mononobe-Ok-abe方法、Koerner方法和Fellen ius方法,以抗液化安全系数、液化侧向流动安全系数、液化喷砂安全系数和抗滑安全系数为评价指标,系统对地震液化型路堤边坡安全性进行了分析、计算和评价。结果显示,文中方法对地震液化型路堤边坡安全性分析具有适用性。
Seismic liquefaction problems of embankment slope related to two different subject fields(geotechnical engineering and engineering seismology),is a cross topic of slope engineering and sand liquefaction.Sand soil under embankment slope can be liquefied by earthquake,and can lead to liquefaction problems such as bearing capacity,settlement,lateral spreading,sand boils and global sliding.Using NCCER method(SPT),Mononobe-Okabe method,Koerner method and Fellenius method,the assessment index system including liquefaction safety factor,liquefaction lateral spreading safety factor,liquefaction sand boils safety factor and sliding safety factor,is put forward to evaluate the security of embankment slope with liquefaction problems.As a case study,the result shows the methods have wide applicability for embankment slope with liquefaction problems.
Seismic liquefaction problems of embankment slope related to two different subject fields(geotechnical engineering and engineering seismology),is a cross topic of slope engineering and sand liquefaction.Sand soil under embankment slope can be liquefied by earthquake,and can lead to liquefaction problems such as bearing capacity,settlement,lateral spreading,sand boils and global sliding.Using NCCER method(SPT),Mononobe-Okabe method,Koerner method and Fellenius method,the assessment index system including liquefaction safety factor,liquefaction lateral spreading safety factor,liquefaction sand boils safety factor and sliding safety factor,is put forward to evaluate the security of embankment slope with liquefaction problems.As a case study,the result shows the methods have wide applicability for embankment slope with liquefaction problems.
引文
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[18]Cornforth,Derek H.Landslides in practice:investigation,analysis and remedial/preventative options in soils[M].Hoboken,N.J.:J.Wiley,2005.
[2]Zhou Yanguo,Chen Yunmin,Ling Daosheng.Shear wave velocity-based liquefaction evaluation in the great Wenchuan earthquake:a preliminarycase study[J].Earthquake Engineering and Engineering Vibration,2009,8(2):231-239.
[3]陈文化,门福录.倾斜地层地震液化和滑移的有限元分析[J].地震工程与工程振动,2002,22(1):132-140.
[4]任红梅,吕西林,李培振.饱和砂土液化研究进展[J].地震工程与工程振动,2007,27(6):166-175.
[5]Fu Lei,Zeng Xiangwu.Seismic rehabilitation and analysis of Chaohe earthdam[J].Earthquake Engineering and Engineering Vibration,2005,4(2):265-273.
[6]Adalier K,Elgamal A,Martin G R.Foundation liquefaction countermeasures for earth embankments[J].Journal of Geotechnical and Geoenvir-onmental Engineering,ASCE,1998,124(6):500-517.
[7]Makdisi F,Seed H B.Simplified procedure for estimating dam and embankment earthquake-induced deformations[J].J.Geotech.Engrg.Div.,ASCE,1978,104(GT7):849-867.
[8]Balakrishnan A,Kutter B L.Settlement,sliding,and liquefaction remediation of layered soil[J].Journal of Geotechnical and GeoenvironmentalEngineering,ASCE,1999,125(11):968-978.
[9]Seed H B,Idriss I M.Simplified procedure for evaluating soil liquefaction potential[J].Journal of Soil Mechanics&Foundations Division,ASCE,1971,97(SM9):1249-1273.
[10]Youd TL,Idriss I M.Proceedings of the NCEER workshop on evaluation of liquefaction resistance of soils[R].Buffalo,NY:National Center forEarthquake Engineering Research,1997.
[11]Mononobe N,Matsuo H.On the determination of earth pressures during earthquakes[C]//Proceedings of the World Engineering Conference.To-kyo:1929,9:177-185.
[12]Okabe S.General theory on earth pressure and seismic stability of retaining wall and dam[J].Journal of Japan Society of Civil Engineers,1924,10(6):1277-1323.
[13]Koerner R M.Designing with geosynthetic[M].4th ed.Prentice Hall:Upper Saddle River,N J,1998.
[14]Fellenius.Earth stability calculations assuming friction and cohesion on circular slip surfaces[M].Berlin:W.Ernst,1927.
[15]Bishop A W.The use of the slip circle in the stability analysis of slopes[J].Geotechnique,1955,5(1):7-17.
[16]Janbu N.Slope stability computations embankment dam engineering[M].New York:John Wiley and Sons,1973.
[17]Kramer S L.Geotechnical earthquake engineering[M].Prentice Hall:Englewood Cliffs,N J,1996.
[18]Cornforth,Derek H.Landslides in practice:investigation,analysis and remedial/preventative options in soils[M].Hoboken,N.J.:J.Wiley,2005.
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