适用于新疆巴楚地区的CPT液化判别新方法
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摘要
以2003年新疆巴楚—伽师地区Ms6.8级地震大规模砂土液化为背景,通过对地震液化场地的详细勘察,获取了39个场地的静力触探勘察数据,根据现有国内外静力触探液化判别方法均不适合于新疆巴楚地区的情况,依据实测数据建立了含锥尖阻力基准值、地下水位、砂层埋深、地震烈度等常规参数的液化判别新公式。建立的液化判别方法分为初判和复判两部分,初判条件以特征深度表示;复判公式对液化场地和非液化场地的回判别成功率均在95%左右,可靠度较高。提出的公式形式与中国工程上最常用的液化判别公式一致,可为新疆地区液化判别及相关地区性规范制订提供技术支持。
In 2003,a large-scale liquefied phenomenon occurred in Bachu-Jiashi region of Xinjiang due to an earthquake of Ms6.8,39 in-situ CPT data are collected from the liquefied liquefied sites.Since the existing CPT-based prediction methods for soil liquefaction are not applicable to Bachu region of Xinjiang,a new evaluation formula is proposed based on the measured data of cone tip resistance value,ground water level,sand burial depth and intensity.The evaluation method is divided into the initial evaluation and the next evaluation.The evaluation success ratio is 95% in liquefied sites and is 94% in non-liquefied sites.The results show that the model has high reliability.The form of the proposed formula is in accordance with that of the most commonly-used liquefaction formula in China.The new formula may provide technical support for prediction of soil liquefaction in Xinjiang and relate areas.
In 2003,a large-scale liquefied phenomenon occurred in Bachu-Jiashi region of Xinjiang due to an earthquake of Ms6.8,39 in-situ CPT data are collected from the liquefied liquefied sites.Since the existing CPT-based prediction methods for soil liquefaction are not applicable to Bachu region of Xinjiang,a new evaluation formula is proposed based on the measured data of cone tip resistance value,ground water level,sand burial depth and intensity.The evaluation method is divided into the initial evaluation and the next evaluation.The evaluation success ratio is 95% in liquefied sites and is 94% in non-liquefied sites.The results show that the model has high reliability.The form of the proposed formula is in accordance with that of the most commonly-used liquefaction formula in China.The new formula may provide technical support for prediction of soil liquefaction in Xinjiang and relate areas.
引文
[1]SEED H B.Soil liquefaction and cyclic mobility evaluation forlevel ground during earthquake[J].Journal of theGeotechnical Engineering Division,ASCE,1979,105(GT2):201-255.
[2]SEED H B,IDRISS I M.Simplified procedure for evaluatingsoil liquefaction potential[J].Journal of the Soil Mechanicsand Foundations Division,ASCE,1971,107(SM9):1249-1274.
[3]YOUD T L,IDRISS I M.Proceedings of the NCEERWorkshop on evaluation of liquefaction resistance of soils[R].Buffalo:NCEER,1997.
[4]李兆焱.基于巴楚地震调查的液化判别方法研究[D].哈尔滨:中国地震局工程力学研究所,2012.(LI Zhao-yan.Astudy into liquefaction discrimination methods based onsurveys of the bachu earthquake[D].Harbin:Institute ofEngineering Mechanics,2012(in Chinese))
[5]李兆焱,孙锐,曹振中,等.静力触探法对巴楚地震液化判别的适用性[J].岩土力学,2010,31(12):3907-3912.(LIZhao-yan,SUN Rui,CAO Zhen-zhong,et al.Feasibility ofcone penetration test to evaluating Bachu earthquakeliquefaction[J].Rock and Soil Mechanics,2010,31(12):3907-3912.(in Chinese))
[6]HOLZER Thomas L,BENNETT Michael J,PONTI Daniel J,et al.Liquefaction and soil failure during 1994 northridgeearthquake[J].Journal of Geotechnical and GeoenvironmentalEngineering,1999,125:438-452.
[7]HWANG Jin-hung,YANG Chin-wen.Verification of criticalcyclic strength curve by Taiwan Chi-Chi earthquake data[J].Soil Dynamics and Earthquake Engineering,2001,21:237-257.
[8]GB50021—2001岩土工程勘察规范[S].北京:中国建筑工业出版社,2001.(GB50021—2001Code for seismic designof buildings[S].Beijing:China Architecture and BuildingPress,2001.(in Chinese))
[9]谢君斐.关于修改抗震规范砂土液化判别式的几点意见[J].地震工程与工程振动,1984,4(2):95-126.(XIE Jun-fei.Some comments on the formula for estimating theliquefaction of sand in revised a seismic design code[J].Journal of Earthquake Engineering and Engineering Vibration1984,4(2):95-126.(in Chinese))
[2]SEED H B,IDRISS I M.Simplified procedure for evaluatingsoil liquefaction potential[J].Journal of the Soil Mechanicsand Foundations Division,ASCE,1971,107(SM9):1249-1274.
[3]YOUD T L,IDRISS I M.Proceedings of the NCEERWorkshop on evaluation of liquefaction resistance of soils[R].Buffalo:NCEER,1997.
[4]李兆焱.基于巴楚地震调查的液化判别方法研究[D].哈尔滨:中国地震局工程力学研究所,2012.(LI Zhao-yan.Astudy into liquefaction discrimination methods based onsurveys of the bachu earthquake[D].Harbin:Institute ofEngineering Mechanics,2012(in Chinese))
[5]李兆焱,孙锐,曹振中,等.静力触探法对巴楚地震液化判别的适用性[J].岩土力学,2010,31(12):3907-3912.(LIZhao-yan,SUN Rui,CAO Zhen-zhong,et al.Feasibility ofcone penetration test to evaluating Bachu earthquakeliquefaction[J].Rock and Soil Mechanics,2010,31(12):3907-3912.(in Chinese))
[6]HOLZER Thomas L,BENNETT Michael J,PONTI Daniel J,et al.Liquefaction and soil failure during 1994 northridgeearthquake[J].Journal of Geotechnical and GeoenvironmentalEngineering,1999,125:438-452.
[7]HWANG Jin-hung,YANG Chin-wen.Verification of criticalcyclic strength curve by Taiwan Chi-Chi earthquake data[J].Soil Dynamics and Earthquake Engineering,2001,21:237-257.
[8]GB50021—2001岩土工程勘察规范[S].北京:中国建筑工业出版社,2001.(GB50021—2001Code for seismic designof buildings[S].Beijing:China Architecture and BuildingPress,2001.(in Chinese))
[9]谢君斐.关于修改抗震规范砂土液化判别式的几点意见[J].地震工程与工程振动,1984,4(2):95-126.(XIE Jun-fei.Some comments on the formula for estimating theliquefaction of sand in revised a seismic design code[J].Journal of Earthquake Engineering and Engineering Vibration1984,4(2):95-126.(in Chinese))
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