场地土最大动剪模量的室内外试验研究
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摘要
为了更可靠地获取场地土动剪模量,利用JB型波速仪,采用单孔法,现场对场地土分别沿1.80 m、2.80 m、3.65 m和6.65 m深度进行了波速测试,得到了场地各层土的剪切波速。此外,取出了场地各层土的原状土样,进行了室内循环单剪试验,获得了各层土的动剪模量,并与剪切波速的计算结果进行了比较分析。结果表明,由现场剪切波速试验和室内循环单剪试验得到的最大动剪模量比较接近,说明两种试验的结果都比较可信,两者可以相互验证,建议实际应用中将两者综合考虑。
To get reliable dynamic shear modulus of site soil,wave velocity of site soil is tested in situ along the depth of 1.80 m,2.80 m,3.65 m and 6.65 m by using single hole method with the JB type of wave velocity apparatus,and the shear wave velocity of each layer soil is obtained.Furthermore,undisturbed samples of each layer soil are taken out,and the maximum dynamic shear modulus is obtained by laboratory cyclic simple shear tests.The results between cyclic simple shear test and shear wave velocity field test are analyzed comparatively.It is showed that the maximum dynamic shear modulus obtained from cyclic simple shear test is close to that of shear wave velocity field test,so the results of two types of tests are creditable,and can approve each other.It is suggested that,in practice,the adopted modulus must be determined by comprehensively considering the results obtained from experiment and field test.
To get reliable dynamic shear modulus of site soil,wave velocity of site soil is tested in situ along the depth of 1.80 m,2.80 m,3.65 m and 6.65 m by using single hole method with the JB type of wave velocity apparatus,and the shear wave velocity of each layer soil is obtained.Furthermore,undisturbed samples of each layer soil are taken out,and the maximum dynamic shear modulus is obtained by laboratory cyclic simple shear tests.The results between cyclic simple shear test and shear wave velocity field test are analyzed comparatively.It is showed that the maximum dynamic shear modulus obtained from cyclic simple shear test is close to that of shear wave velocity field test,so the results of two types of tests are creditable,and can approve each other.It is suggested that,in practice,the adopted modulus must be determined by comprehensively considering the results obtained from experiment and field test.
引文
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[2]Nazarian S,Stokoe K H.In situ shear wave velocitiesfrom spectral analysis of surface waves[A].Proceeding of the 8th World Conference onEarthquake Engineering[C].San Francisco,California,U.S.A.,1984.
[3]Pitilakis K D,Anstassiadis A,Roptakis D.Field andlaboratory determination of dynamic properties ofnature soil deposits[A].Tenth World Conference onEarthquake Engineering[C].Balke ma Rotteram,1992.
[4]顾尧章.海底粘土的剪切模量[J].岩土工程学报,1995,17(2).
[5]何昌荣.动模量和阻尼的动三轴试验研究[J].岩土工程学报,1997,19(2).
[6]袁晓铭,孙锐,孙静,等.常规土类动剪切模量比和阻尼比试验研究[J].地震工程与工程振动,2000,20(4).
[7]陈国兴,谢君斐,张克绪.土的动模量和阻尼比的经验估计[J].地震工程与工程振动,1995,15(1).
[8]南京水利科学研究院土工研究所.土工试验技术手册[M].北京:人民交通出版社,2003.
[9]孙静,袁晓铭.土的动模量和阻尼比研究评述[J].世界地震工程,2003,19(1).
[10]任慧.场地动力反应的理论分析与场地土动力特性试验研究[D].湖南长沙:湖南大学,2004.
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