不同粘粒含量粉质土的动力强度特性研究
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摘要
通过室内实验研究了黄河三角洲地区粘粒质量分数为3%~15%的饱和粉土动力强度特性。使用动三轴施加轴向动力,测得试样在动荷载作用下达到破坏时所需的振动次数及破坏过程中孔隙水压力的变化情况。试验结果显示每一组试样在不同循环应力作用下饱和粉土的破坏振次随剪应力比的增加而减小。通过对比分析不同粘粒含量粉土动强度特征曲线,得出粉土动强度对粘粒含量有很大的依赖性,在一定粘粒含量范围内,粉土动强度随粘粒含量增加先减小后增大。
The silt within which there is clay in a mass percentage between 3% and 15% are sampled from the Yellow River Delta Area.The dynamical intensity features of the saturated samples are studied in the laboratory,as the axial force is excerted on the sample triaxises to detect the viberating frequency when it is broken,and the pressure variation in the pore water during the breaking process.It is shown from the experimental results that the viberating frequency at the instant of the saturated sample breaking is decreased with the shear-stress-ratio increase when a group of the samples are effected by various cyclic stress.After the curves of the dynamical intensity features for the silt with various clay-particle contents has been analyzed and compared,it is learnt that the dynamical intensity greatly depends on the clay-particle contents.Within the studied range of the clay-particle,the silt dynamical intensity is decreased with the clay-particle content increasing,and becomes increased with its further increasing.
The silt within which there is clay in a mass percentage between 3% and 15% are sampled from the Yellow River Delta Area.The dynamical intensity features of the saturated samples are studied in the laboratory,as the axial force is excerted on the sample triaxises to detect the viberating frequency when it is broken,and the pressure variation in the pore water during the breaking process.It is shown from the experimental results that the viberating frequency at the instant of the saturated sample breaking is decreased with the shear-stress-ratio increase when a group of the samples are effected by various cyclic stress.After the curves of the dynamical intensity features for the silt with various clay-particle contents has been analyzed and compared,it is learnt that the dynamical intensity greatly depends on the clay-particle contents.Within the studied range of the clay-particle,the silt dynamical intensity is decreased with the clay-particle content increasing,and becomes increased with its further increasing.
引文
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[2]YOUD T L,IDRISS I M.Liquefaction resistance of soils:summary report from the 1996 NCEERand 1988 NCEER/NSF workshops on eraluation of liquefaction resistance of soils[J].Journal ofgeotechnical and geoenvironmental engineering,2001,127(4):297-313.
[3]PURI V K.Liquefaction behavior and dynamic properties loessial(silty)soils[D].Missouri:Uni-versity of Missouri-Rolla,1984.
[4]PURI V K.Liquefaction aspects of loessial soils[C]//Proc.U.S.Nat.Conf.On Earthquake Engi-neering Research Inst.,EI Cerito,Calid.,1990:755-762.
[5]SANDOVAL J.Liquefaction and settlement characteristics of silty soils[D].Missouri:Universityof Missouri-Rolla,1989.
[6]PRAKASH S,SANDOVAL J A.Liquefaction of low plastic silts[J].Soil Dynamic and Earth-quake Engrg.,1992,71(7):373-397.
[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):5-8.
[8]胡华.粘粒含量对淤泥质软土流变参数的影响及其机理分析[J].探讨与分析,2005,11(8):34-36.
[9]国家质量技术监督局.GB/T 50269-1997地基土动力特性测试规范[S].北京:中国标准出版社,1997.
[10]曾长女,刘汉龙,周云东.粉土动力特性研究综述[J].防灾减灾工程学报,2005,25(1):99-104.
[11]卢成原,汤丽君,孟凡丽.海底粉土动力特性的试验研究[J].工程勘察,2006,12:15-17.
[12]牛琪瑛,张素娇.地基土液化机理的研究[J].太原理工大学学报,2002,33(3):246-256.
[13]刘雪珠,陈国兴.粘粒含量对南京粉细砂液化影响的试验研究[J].地震工程与工程振动,2003,23(3):150-155.
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