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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >On the influence of a non-cohesive fines content on small strain stiffness, modulus degradation and damping of quartz sand
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On the influence of a non-cohesive fines content on small strain stiffness, modulus degradation and damping of quartz sand

机译：非粘性细粉含量对石英砂小的应变刚度，模量降低和阻尼的影响

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The influence of a non-cohesive fines content on small-strain shear modulus G., small-strain constrained elastic modulus M-max, shear modulus degradation G(gamma)/G(max), damping ratio D(gamma) and threshold shear strain amplitudes gamma(tl) and gamma(tv), has been studied in approx. 130 resonant column (RC) tests with additional P-wave measurements by means of piezoelectric elements. Specially mixed continuous grain size distribution curves of a quartz sand with varying fines contents (0 <= FC <= 20%, defined as the mass percentage of grains with size d < 0.063 mm according to DIN standard code) and uniformity coefficients (1.5 <= C-u <= 50) have been tested at different relative densities and pressures. A significant decrease of G(max) and M-max with increasing fines content was observed, while the modulus degradation curves G(7)/Gmax were found rather independent of FC. A pressure-dependent decrease of the damping ratio and a slight increase of the threshold shear strain amplitudes gamma(tl) and gamma(tv) with fines content were measured. Extensions of several empirical equations for G(max), M-max, G(gamma)/G(max) and D(gamma) considering the influence of the fines content are proposed in the paper. (C) 2014 Elsevier Ltd. All rights reserved.
机译：非粘性细粉含量对小应变剪切模量G.，小应变约束弹性模量M-max，剪切模量降解Gγ/ G（max），阻尼比D（γ）和阈值剪切的影响应变幅值γ（t1）和γ（tv）已在大约10 130次共振柱（RC）测试，通过压电元件进行额外的P波测量。细度含量不同（0 <= FC <= 20％，根据DIN标准规范定义为d <0.063 mm的晶粒的质量百分比）的石英砂的特殊混合连续粒度分布曲线和均匀系数（1.5 < = Cu <= 50）已在不同的相对密度和压力下进行了测试。随着细粉含量的增加，G（max）和M-max显着下降，而模量降解曲线G（7）/ Gmax则与FC无关。测得了阻尼比的压力依赖性降低以及阈值剪切应变振幅gamma（tl）和gamma（tv）随细粉含量的增加而略有增加。提出了考虑细粉含量影响的G（max），M-max，G（γ）/ G（max）和D（γ）几个经验方程的扩展。 （C）2014 Elsevier Ltd.保留所有权利。

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