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
Experimental study on influences of fines content and consolidation stress on shear modulus and damping ratio of saturated sand
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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。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%
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