天津地区饱和粉土地震液化的试验研究
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摘要
地震液化是导致地基失稳和上部结构受损的直接原因之一。通过对天津地区粉土进行原位取土以及现场原位测试分析,研究了粉土土质特点对液化判别的影响,并在动三轴试验基础上阐述了该区域粉土的动力特性和液化机制。结合原位测试方法比较了现有的地震液化判别方法,指出该区域粉土液化判别应考虑粉土成分特征的影响,并提出孔压达到围压的60%～90%,双幅应变达到4%可作为液化的判别标准。
The soil liquefaction caused by earthquake is one of the direct reasons for the foundation invalidation and the structure collapse.Based on in-situ tests,liquefaction estimation of silt with different origins in Tianjin area is studied.Then the dynamic properties and liquefaction mechanism of the silt were illuminated based on dynamic triaxial test.And a comparison between the existed earthquake liquefaction assessment methods was made.combined with the in-situ tests.It is suggested that the influence of silt content should be taken into account in the liquefaction assessment;and the value of pore water pressure is 60%-90% of confining pressure,the value of double amplitude strain is 4%,these values can be used as the indexes of liquefaction evalution.
The soil liquefaction caused by earthquake is one of the direct reasons for the foundation invalidation and the structure collapse.Based on in-situ tests,liquefaction estimation of silt with different origins in Tianjin area is studied.Then the dynamic properties and liquefaction mechanism of the silt were illuminated based on dynamic triaxial test.And a comparison between the existed earthquake liquefaction assessment methods was made.combined with the in-situ tests.It is suggested that the influence of silt content should be taken into account in the liquefaction assessment;and the value of pore water pressure is 60%-90% of confining pressure,the value of double amplitude strain is 4%,these values can be used as the indexes of liquefaction evalution.
引文
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[2]柯瀚,陈云敏,周燕国,等.动态三轴试验确定砂土抗液化强度[J].土木工程学报,2004,37(9):48-54.KE Han,CHEN Yun-min,ZHOU Yan-guo,et al.Evaluation of liquefaction resistance by means of triaxial tests with shear wave velocity measurement[J].China Civil Engineering Journal,2004,37(9):48-54.
[3]STARK T D,OLSON S M.Liquefactioon resistance using CPT and field case histories[J].Journal of Geo-technical Engineering,1995,121(12):856-869.
[4]ANDRUS R D,STOKOE K H.Liquefaction resistance of soils from shear-wave velocity[J].Journal of Geo-technical and Geoenvironmental Engineering,ASCE,2000,126(11):1015-1025.
[5]GUO T Q,PRAKASH S.Liquefaction of silts and silt-clay mixtures[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,1999,125(8):706-710.
[6]谢定义.土动力学[M].西安:西安交通大学出版社,1988.
[7]黄博,陈云敏,殷建华,等.粉土和粉砂的动力特性试验研究[J].浙江大学学报(工学版),2002,36(2):143-147.HUANG Bo,CHEN Yun-min,YIN Jian-hua,et al.Laboratory study on dynamic properties of silt and silty sand[J].Journal of Zhejiang University(Engineering Science),2002,36(2):143-147.
[8]李飒,孙兴松,要明伦.混黏土的粉土、粉砂室内试验液化判别标准的研究[J].岩土力学,2006,27(3):360-364.LI Sa,SUN Xing-song,YAO Ming-lun,Study of liquefaction evaluation used in indoor test of silt,silty sand mixed clay[J].Rock and Soil Mechanics,2006,27(3):360-364.
[9]王峻,王兰民,李兰.饱和砂土液化的动三轴试验判断与评价[J].西北地震学报,2004,26(3):285-288.WANG Jun,WANG Lan-min,LI Lan.The dynamic triaxial test discrimination and evaluation for liquefaction of saturated sand[J].Northwestern Seismological Journal,2004,26(3):285-288.
[10]袁聚云,徐超,赵春风.土工试验与原位测试[M].上海:同济大学出版社,2004.
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