我国标贯液化判别方法对黄土适用性研究
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摘要
鉴于我国20世纪50年代以来,地震液化现场很少有黄土液化的实例,而饱和黄土甚至高含水率的黄土也具有很高的液化势和流态破坏势。为工程设计准确预测饱和黄土在设计地震动的作用下是否会液化,本文用Seed-Idriss简化判别法对兰州某民用机场的饱和黄土和砂土进行液化判别,并以此结果为依据检验规范判别式对黄土液化判别的适用性。结论证实用Seed-Idriss简化判别法结果检验规范方法对黄土的适用性是可行的,规范方法对于黄土液化判别过于保守。
There is few seismic liquefied loess site in China since 1950s.However,saturated loess,including loess with high moisture content,has a high liquefaction potential and flow pattern damage potential.In order to predict the saturated loess site under design ground motion to be liquefied accurately for engineering design,Seed's simplified procedure is used to estimate the liquefaction potential of saturated loess and sand of a civilian airport in Lanzhou,and the applicability of the method for estimating liquefaction potential of sandy soils in Chinese seismic design code for loess will be tested.The results show that the method of applicability test in this paper is reasonable and practical and the method for estimating liquefaction in Chinese seismic design code is too conservative for loess.
There is few seismic liquefied loess site in China since 1950s.However,saturated loess,including loess with high moisture content,has a high liquefaction potential and flow pattern damage potential.In order to predict the saturated loess site under design ground motion to be liquefied accurately for engineering design,Seed's simplified procedure is used to estimate the liquefaction potential of saturated loess and sand of a civilian airport in Lanzhou,and the applicability of the method for estimating liquefaction potential of sandy soils in Chinese seismic design code for loess will be tested.The results show that the method of applicability test in this paper is reasonable and practical and the method for estimating liquefaction in Chinese seismic design code is too conservative for loess.
引文
[1]石兆吉,王兰民.土壤动力特性.液化势及危害性评价[M].北京:地震出版社,1999.SHI Zhaoji,WANG Lanmin.Dynamic characteristics of soil,liquefaction potential and hazard evaluation[M].Beijing:Seismic Press,1999.(inChinese)
[2]王峻,王兰民,李兰.黄土场地地震液化研究[J].地震研究,2006,29(4):392-395.WANG Jun,WANG Lanmin,LI Lan.Earthquake liquefaction of loess site[J].Journal of Seismological Research,2006,29(4):392-395.(inChinese)
[3]GB50011-2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.GB50011-2010 Code for Seismic Design of Buildings[S].Beijing:China Architecture and Building Press,2010.(in Chinese)
[4]陈国兴,胡庆兴,刘雪珠.关于砂土液化判别的若干意见[J].地震工程与工程振动,2002,22(1):141-151.CHEN Guoxing,HU Qingxing,LIU Xuezhu.Some comments on methodologies for estimating liquefaction of sandy soils[J].Journal of EarthquakeEngineering and Engineering Vibration,2002,22(1):141-151.(in Chinese)
[5]石兆吉,张荣祥,顾宝和.砂土液化判别和评价综合方法研究[J].地震工程与工程振动,1997,17(1):82-88.SHI Zhaoji,ZHANG Rongxiang,GU Baohe.Study on synthetic methods for criteria and appraisal of sand liquefaction[J].Journal of EarthquekeEngineering AND Engineering Vibration,1997,17(1):82-88.(in Chinese)
[6]曹振中.基于可靠性理论的砂土液化判别方法研究[D].哈尔滨:中国地震局工程力学研究所,2006.CAO Zhenzhong.Study on reliability-based procedure for evaluating liquefaction potential[D].Harbin:Institute of Engineering Mechanics,ChinaEarthquake Administration,2006.(in Chinese)
[7]Seed H B.Soil liquefaction and cyclic mobility evaluation for level ground during earthquakes[J].Journal of Geotechnical Engineering Division,ASCE,1979,105(GT2):201-255.
[8]Youd T L,Idriss I M.Liquefaction resistance of soils:Summary report from the 1996 NCEER and 1998 NCEER/NSF workshops on evaluation ofliquefaction resistance of soils[J].Journal of Geotechnical and Geoenvironment Engineering,2001,127(4):297-313.
[9]Seed R B,Cetin K O,Moss RES,et al.Recent advances in soil Liquefaction engineering,a unified and consistent framework[R].EERC,USA:Earthquake Engineering Research Center,2003.
[2]王峻,王兰民,李兰.黄土场地地震液化研究[J].地震研究,2006,29(4):392-395.WANG Jun,WANG Lanmin,LI Lan.Earthquake liquefaction of loess site[J].Journal of Seismological Research,2006,29(4):392-395.(inChinese)
[3]GB50011-2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.GB50011-2010 Code for Seismic Design of Buildings[S].Beijing:China Architecture and Building Press,2010.(in Chinese)
[4]陈国兴,胡庆兴,刘雪珠.关于砂土液化判别的若干意见[J].地震工程与工程振动,2002,22(1):141-151.CHEN Guoxing,HU Qingxing,LIU Xuezhu.Some comments on methodologies for estimating liquefaction of sandy soils[J].Journal of EarthquakeEngineering and Engineering Vibration,2002,22(1):141-151.(in Chinese)
[5]石兆吉,张荣祥,顾宝和.砂土液化判别和评价综合方法研究[J].地震工程与工程振动,1997,17(1):82-88.SHI Zhaoji,ZHANG Rongxiang,GU Baohe.Study on synthetic methods for criteria and appraisal of sand liquefaction[J].Journal of EarthquekeEngineering AND Engineering Vibration,1997,17(1):82-88.(in Chinese)
[6]曹振中.基于可靠性理论的砂土液化判别方法研究[D].哈尔滨:中国地震局工程力学研究所,2006.CAO Zhenzhong.Study on reliability-based procedure for evaluating liquefaction potential[D].Harbin:Institute of Engineering Mechanics,ChinaEarthquake Administration,2006.(in Chinese)
[7]Seed H B.Soil liquefaction and cyclic mobility evaluation for level ground during earthquakes[J].Journal of Geotechnical Engineering Division,ASCE,1979,105(GT2):201-255.
[8]Youd T L,Idriss I M.Liquefaction resistance of soils:Summary report from the 1996 NCEER and 1998 NCEER/NSF workshops on evaluation ofliquefaction resistance of soils[J].Journal of Geotechnical and Geoenvironment Engineering,2001,127(4):297-313.
[9]Seed R B,Cetin K O,Moss RES,et al.Recent advances in soil Liquefaction engineering,a unified and consistent framework[R].EERC,USA:Earthquake Engineering Research Center,2003.
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