饱和粉土液化后变形特性试验研究
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摘要
利用多功能静动液压剪切三轴仪,进行了一系列饱和粉土液化后变形特性试验,研究了干密度和液化程度对粉土液化后变形特性的影响,并考虑试验动加载前小幅预振和不规则动加载对粉土液化后变形特性的影响。试验结果表明,液化后变形可由两段应变ε0和εd组成。干密度越小,ε0越大,εd段剪切模量越低;液化越严重ε0越大,不同液化程度对εd段剪切模量影响很小;动加载前小幅预振和不规则动加载对液化后变形影响较小。提出了饱和粉土液化后变形模型,给出了模型参数的推导。验证结果表明,该模型的计算值与试验值吻合较好,说明该模型能很好地描述这种变形行为。
A series of tests have been conducted to simulate post-liquefaction behavior of silt in a new universal triaxial torsional shear apparatus of Hohai University.Such effects on post-liquefaction of silt as soil dry density,severity of liquefaction,pre-vibration,non-regular vibration are discussed.It is found that post-liquefaction strain is composed of ε0 and εd.The bigger dry density is the larger ε0 and the larger shear modulus are during the stage of εd The more serious of liquefaction is,the larger ε0 is.But there is no difference of shear modulus during the stage of εd,when severity of liquefaction change.The pre-vibration and non-regular vibration affects slightly on post-liquefaction stress-strain relationship.A new post-liquefaction model of liquefied silt is proposed based on test results.And how to obtain parameters of the model is also introduced.The results predicted by the proposed method are consistent well with the experiment observation.
A series of tests have been conducted to simulate post-liquefaction behavior of silt in a new universal triaxial torsional shear apparatus of Hohai University.Such effects on post-liquefaction of silt as soil dry density,severity of liquefaction,pre-vibration,non-regular vibration are discussed.It is found that post-liquefaction strain is composed of ε0 and εd.The bigger dry density is the larger ε0 and the larger shear modulus are during the stage of εd The more serious of liquefaction is,the larger ε0 is.But there is no difference of shear modulus during the stage of εd,when severity of liquefaction change.The pre-vibration and non-regular vibration affects slightly on post-liquefaction stress-strain relationship.A new post-liquefaction model of liquefied silt is proposed based on test results.And how to obtain parameters of the model is also introduced.The results predicted by the proposed method are consistent well with the experiment observation.
引文
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[2]林本海,李业茂.粉土工程性质的探讨[A].中国土木工程学会第八届土力学及岩土工程学术会议论文集[C].北京:万国学术出版社,1999.181-184.
[3]石兆吉,郁寿松,王余庆,等.饱和轻亚黏土地基液化可能性判别[J].地震工程与工程振动,1984,4(3):71-81.SHI Zhao-ji,YU Shou-song,WANG Yu-qing,et al.Prediction of liquefaction potential of saturated clayed silt[J].Earthquake Engineering and Engineering Vibration,1984,4(3):71-81.
[4]Seed H B,Tokimatsu K,Harder L F,et al.Influence of SPT procedures in soil liquefaction resistance evaluations[J].Journal of Geotechnical Engineering,ASCE,1985,111(12):1 425-1 445.
[5]Youd T L,Idriss I M,Andrus R D,et al.Liquefaction resistance of soils[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2001,127(10):817-833.
[6]衡朝阳,何满潮,裘以惠.含黏粒砂土抗液化性能的试验研究[J].工程地质学报,2001,9(4):339-344.HENG Chao-yang,HE Man-chao,QIU Yi-hui.Experimental study of liquefaction-resistant characteristics of clayed sand[J].Journal of Engineering Geology,2001,9(4):339-334.
[7]牛琪瑛,裘以惠,史美筠.粉土抗液化特性的试验研究[J].太原工业大学学报,1996,27(3):5-9.NIU Qi-ying,QIU Yi-hui,SHI Mei-yun.The study and test of liquefaction resistant characteristics of silt[J].Journal of Taiyuan University of Technology,1996,27(3):5-9.
[8]阮永芬,巫志辉.饱和粉土的若干动力特性研究[J].岩土工程学报,1995,17(4):100-106.RUAN Yong-fen,WU Zhi-hui.Some dynamic properties of saturated sandy loam[J].Chinese Journal of Geotechnical Engineering,1995,17(4):100-106.
[9]黄博.粉土和粉砂的动力特性及地震液化研究[D].杭州:浙江大学,2000.
[10]刘汉龙,周云东,余湘娟,等.多功能静动三轴仪研制及在液化后大变形中的应用[J].大坝观测与土工测试,2001,25(5):48-51.LIU Han-long,ZHOU Yun-dong,YU Xiang-juan,et al.Design of static-dynamic dual purpose triaxial compression test apparatus and application in the study of earthquake-induced large deformation[J].Dam Observation and Geotechnical Tests,2001,25(5):48-51.
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