黄河三角洲饱和粉土层地震液化判别方法及液化特征研究
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摘要
黄河三角洲地区存在大量的粉土层,在地震作用下可能出现液化破坏。根据不同的沉积历史选取4个典型研究区,通过现场标准贯入试验、静力触探试验和剪切波速测试等原位技术对黄河三角洲地区饱和粉土层的地震液化判别方法及其液化特征进行分析。结果表明,综合采用静力触探和标准贯入试验进行液化判别的方法结果较好;在黄河三角洲地区,地震液化破坏主要发生在埋深1～5 m的黏粒含量为10%～15%的饱和粉土层中,建议该地区粉土层的地震液化初判条件中考虑土层埋深的影响,同时对是否发生液化的临界黏粒含量百分率做适当调整。
Earthquake-induced liquefaction may occur in the Yellow River Delta for the great deal of silty soil.Four typical areas formed in different sedimentary periods are investigated by methods of standard penetration test(SPT),cone penetration test(CPT) and shear wave velocity test(SWVT),to analyze the prediction methods and characteristics of liquefaction.It has been shown that synthetically using the methods of SPT and CPT is suitable for estimating the liquefaction.In the Yellow River Delta areas,liquefaction mainly occurred in the silty soil with depth of 1–5 m containing clayey particles of 10%–15%(in weigh).The initial criterion of predicting liquefaction is suggested,which should consider depth of the silty soil and in the same time,the critical percent content of clayey particles to liquefaction should be adjusted.
Earthquake-induced liquefaction may occur in the Yellow River Delta for the great deal of silty soil.Four typical areas formed in different sedimentary periods are investigated by methods of standard penetration test(SPT),cone penetration test(CPT) and shear wave velocity test(SWVT),to analyze the prediction methods and characteristics of liquefaction.It has been shown that synthetically using the methods of SPT and CPT is suitable for estimating the liquefaction.In the Yellow River Delta areas,liquefaction mainly occurred in the silty soil with depth of 1–5 m containing clayey particles of 10%–15%(in weigh).The initial criterion of predicting liquefaction is suggested,which should consider depth of the silty soil and in the same time,the critical percent content of clayey particles to liquefaction should be adjusted.
引文
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[5]陈国兴,张克绪,谢君斐.以剪切波速为指标的液化判别方法及其适用性[J].哈尔滨建筑大学学报,1996,29(1):97–103.(CHEN Guoxing,ZHANG Kexu,XIE Junfei.Methods of liquefaction potential prediction with shear wave velocity as a field index and the adaptability[J].Journal of Harbin University of Civil Engineering and Architecture Engineering,1996,29(1):97–103.(in Chinese))
[6]中国地震局地球物理研究所.胜利油田部分地区地震小区划报告[R].北京:中国地震局地球物理研究所,1991.(Institute of Geophysics,China Earthquake Administration.Seismic hazard analysis of partial area in Shengli oil field[R].Beijing:Institute of Geophysics,China Earthquake Administration,1991.(in Chinese))
[7]中华人民共和国国家标准编写组.GB50011–2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.(The National Standards Compilation Group of People′s Republic of China.GB50011–2001 Code for seismic design[M].Beijing:China Architecture and Building Press,2001.(in Chinese))
[8]中华人民共和国国家标准编写组.GB50021–2001岩土工程勘察规范[S].北京:中国建筑工业出版社,2002.(The National Standards Compilation Group of People′s Republic of China.GB50021–2001 Code for investigation of geotechnical engineering[S].Beijing:China Architecture and Building Press,2002.(in Chinese))
[9]张倬元,王士天,王兰生.工程地质分析原理[M].北京:地质出版社,1994.(ZHANG Zhuoyuan,WANG Shitian,WANG Lansheng.Theory of engineering geology analysis[M].Beijing:Geological Publishing House,1994.(in Chinese))
[10]石兆吉,郁寿松,丰万玲.土壤液化势的剪切波速判别法[J].岩土工程学报,1993,15(1):74–80.(SHI Zhaoji,YU Shousong,FENG Wanling.Method of shear wave velocity for evaluating liquefaction potential[J].Chinese Journal of Geotechnical Engineering,1993,15(1):74–80.(in Chinese))
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