细粒含量及固结应力对饱和砂土动剪切模量和阻尼比影响试验研究

doi:10.11779/CJGE2017S1010

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摘要土的动剪切模量和阻尼比是描述土体动力特性的两个主要参数。利用美国GCTS公司研制的TSH-100型共振柱试验仪对等压固结条件下饱和砂土的动剪切模量和阻尼比进行测试,研究细粒含量（FC）和固结应力对动剪切模量和阻尼比的影响。试验结果表明：各固结应力水平下,细粒含量对砂土动剪切模量和阻尼比的影响规律趋于一致。当0≤FC≤10%时,随着细粒含量的增加,砂土的动剪切模量逐渐减小,阻尼比则逐渐增大;当10% < FC≤40%时,随着细粒含量的增加,砂土的动剪切模量逐渐增大,阻尼比则逐渐减小。细粒含量相同的砂土,随着固结应力的增大,动剪切模量呈增大趋势,阻尼比呈减小趋势。

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	毕昇
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关键词 ： GCTS共振柱, 饱和砂土, 细粒含量, 固结应力, 动剪切模量, 阻尼比

Abstract：The dynamic shear modulus and damping ratio are the two main parameters for describing the dynamic characteristics of soil. The tests on the saturated sand under isotropically consolidation by TSH-100 resonant column apparatus made by GCTS Instruments Ltd. from the USA are performed, and the effects of fines contents (FC) and consolidation stress on the dynamic shear modulus and damping ratio are analyzed. The results show that under different consolidation stress levels, the effects of fines contents on the dynamic shear modulus and damping ratio of sand are the same. When 0≤FC≤10%, the dynamic shear modulus of sand decreases and the damping ratio increases with the increase of fines content. When 10%<FC≤40%, the dynamic shear modulus of sand increases and the damping ratio decreases with the increase of fines content. Under the same fines content, the dynamic shear modulus of sand increases and the damping ratio decreases with the increase of consolidation stress.

Key words： GCTS resonant column saturated sand fines content consolidation stress dynamic shear modulus damping ratio

收稿日期: 2016-11-28

基金资助:国家自然科学基金项目（41172258,51438004）; 国家科技; 重大专项（2013Zx06002001-09）

作者简介: 毕昇(1991-),男,江苏淮安人,硕士研究生,主要从事土动力学方面研究。E-mail:617855804@qq.com。

引用本文:

毕昇,陈国兴,周正龙,吴琪. 细粒含量及固结应力对饱和砂土动剪切模量和阻尼比影响试验研究[J]. 岩土工程学报, 2017, 39(s1): 48-52. BI Sheng, CHEN Guo-xing, ZHOU Zheng-long, WU Qi. Experimental study on influences of fines content and consolidation stress on shear modulus and damping ratio of saturated sand. Chinese J. Geot. Eng., 2017, 39(s1): 48-52.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/10.11779/CJGE2017S1010 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2017/V39/Is1/48

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