现有剪切波速判别方法对巴楚地震液化预测成功率分析
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摘要
以2003年新疆巴楚6.8级地震砂土液化场地调查和现场波速测试为基础,研究目前国内外5种典型的以剪切波速为指标的液化判别式的可行性和适用性问题。分析表明,目前的5种剪切波速液化判别式对于新疆巴楚地区均没有给出满意的结果,成功率只在36%~64%之间。烈度法对巴楚地震液化和非液化场地判别成功率均只有40%左右,且Ⅶ度区偏于危险,Ⅸ度区又偏于保守;5种方法基准值临界线与巴楚地震实际曲线均相差很大,Ⅶ度区均完全错判;需要深入研究巴楚地区的土性特征,建立新疆地区区域性液化判别方法。
Based on liquefaction survey of 2003 Xinjiang Bachu earthquake of Ms6.8 and in-situ shear wave velocity testing data,the feasibility and applicability of five typical liquefaction evaluation methods which use shear wave velocities as criteria are presented herein.Analysis results show that none of the five liquefaction evaluation methods can provide satisfactory result in Bachu area.The successful judging rates of site soil liquefaction are only 36% to 64%.The intensity method which is employed to evaluate liquefied and non-liquefied sites in Bachu area provides only 40% successful judging rates,and the method is risky in intensity VII area and conservative in intensity IX area.The critical lines of the five methods deviate greatly from the actual lines.In intensity VII area all the five methods incorrectly misjudge the site soil liquefaction.Further work has to be conducted to research the soil properties in Bachu area and to establish the regional liquefaction evaluation method in Xinjiang.
Based on liquefaction survey of 2003 Xinjiang Bachu earthquake of Ms6.8 and in-situ shear wave velocity testing data,the feasibility and applicability of five typical liquefaction evaluation methods which use shear wave velocities as criteria are presented herein.Analysis results show that none of the five liquefaction evaluation methods can provide satisfactory result in Bachu area.The successful judging rates of site soil liquefaction are only 36% to 64%.The intensity method which is employed to evaluate liquefied and non-liquefied sites in Bachu area provides only 40% successful judging rates,and the method is risky in intensity VII area and conservative in intensity IX area.The critical lines of the five methods deviate greatly from the actual lines.In intensity VII area all the five methods incorrectly misjudge the site soil liquefaction.Further work has to be conducted to research the soil properties in Bachu area and to establish the regional liquefaction evaluation method in Xinjiang.
引文
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[2]Youd TL,Idriss I M.Proceedings of the NCEER Workshop on Evaluation of liquefaction resistance of soils[R].NCEER Technical Report,1997,NCEER-97-0022,Buffalo,NY.
[3]Seed HB,Cetin KO,et al.Recent advances in soil liquefaction engineering,a unified and consistent framework[R].EERC,USA:EarthquakeEngineering Research Center,2003.
[4]石兆吉,郁寿松.砂性土剪切波速与液化强度的关系[J].世界地震工程,1991,7(3):16-23.
[5]郑志华,王德润,张志毅.土样剪切波速测试装置与方法研究[J].世界地震工程,2002,18(3):42-47.
[6]Cox B R.Development of a direct test method for dynamically assessing the liquefaction resistance of soils in situ[D].The University of Texas atAustin,PhD dissertation 2006.
[7]汪闻韶.土工地震减灾工程中的一个重要参量———剪切波速[J].水利学报,1994,(3):80-84.
[8]Andrus R D,Stokoe KHII.Liquefaction resistance of soils fromshear-wave velocity[J].Journal of Geotechnical and Geoenviromental Engineer-ing,ASCE,2000,126(11):1015-1025.
[9]TBJ1-88建筑地基基础设计规范[S].天津市规划设计管理局主编.北京:中国建筑工业出版社,1993.
[10]石兆吉,郁寿松,丰万玲.土壤液化式的剪切波速判别方法[J].岩土工程学报,1993,15(1):74-80.
[11]丁伯阳,张树清,李藩文.适合西北地区的Vs波预测砂土液化势公式[C]∥第三届全国土动力学学术会议论文集.上海:同济大学出版社,1990.
[12]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.
[13]姬美秀,陈云敏,黄博.弯曲元试验高精度确定土样剪切波速的方法[J].岩土工程学报,2003,25(6):732-73.
[14]王建华,程国勇,等.土层剪切波速的原位与与室内对比试验研究[C]∥第九届土力学及岩土工程学术会议论文集.北京:清华大学出版社,2003:1156-1159.
[15]Youd TL,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.
[16]GB50011-2001建筑抗震设计规范[S].
[2]Youd TL,Idriss I M.Proceedings of the NCEER Workshop on Evaluation of liquefaction resistance of soils[R].NCEER Technical Report,1997,NCEER-97-0022,Buffalo,NY.
[3]Seed HB,Cetin KO,et al.Recent advances in soil liquefaction engineering,a unified and consistent framework[R].EERC,USA:EarthquakeEngineering Research Center,2003.
[4]石兆吉,郁寿松.砂性土剪切波速与液化强度的关系[J].世界地震工程,1991,7(3):16-23.
[5]郑志华,王德润,张志毅.土样剪切波速测试装置与方法研究[J].世界地震工程,2002,18(3):42-47.
[6]Cox B R.Development of a direct test method for dynamically assessing the liquefaction resistance of soils in situ[D].The University of Texas atAustin,PhD dissertation 2006.
[7]汪闻韶.土工地震减灾工程中的一个重要参量———剪切波速[J].水利学报,1994,(3):80-84.
[8]Andrus R D,Stokoe KHII.Liquefaction resistance of soils fromshear-wave velocity[J].Journal of Geotechnical and Geoenviromental Engineer-ing,ASCE,2000,126(11):1015-1025.
[9]TBJ1-88建筑地基基础设计规范[S].天津市规划设计管理局主编.北京:中国建筑工业出版社,1993.
[10]石兆吉,郁寿松,丰万玲.土壤液化式的剪切波速判别方法[J].岩土工程学报,1993,15(1):74-80.
[11]丁伯阳,张树清,李藩文.适合西北地区的Vs波预测砂土液化势公式[C]∥第三届全国土动力学学术会议论文集.上海:同济大学出版社,1990.
[12]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.
[13]姬美秀,陈云敏,黄博.弯曲元试验高精度确定土样剪切波速的方法[J].岩土工程学报,2003,25(6):732-73.
[14]王建华,程国勇,等.土层剪切波速的原位与与室内对比试验研究[C]∥第九届土力学及岩土工程学术会议论文集.北京:清华大学出版社,2003:1156-1159.
[15]Youd TL,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.
[16]GB50011-2001建筑抗震设计规范[S].
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