On the influence of a non-cohesive fines content on small strain stiffness, modulus degradation and damping of quartz sand
On the influence of a non-cohesive fines content on small strain stiffness, modulus degradation and damping of quartz sand
复制标题
DOI：
10.1016/j.soildyn.2014.10.017
复制
发表时间：
2015-02
影响因子：
4
通讯作者：
T. Wichtmann;M. Hernández;T. Triantafyllidis
中科院分区：
文献类型：
--
作者：
T. Wichtmann;M. Hernández;T. Triantafyllidis
研究了非粘性细粒含量对小应变剪切模量G_（max）、小应变约束弹性模量M_（max）、剪切模量退化G（γ）/G_（max）、阻尼比D（γ）和门槛剪切应变幅γ_（tl）和γ_（tv）的影响。130共振柱（RC）测试，通过压电元件进行额外的P波测量。在不同相对密度和压力下，测定了不同细粒含量（0≤ FC≤ 20%，定义为粒度d< 0.063 mm的颗粒的质量百分比）和均匀系数（1.5≤ CU ≤ 50）的石英砂的特殊混合连续粒度分布曲线。随着细粉含量的增加，Gmax和Mmax显著降低，而模量下降曲线G（γ）/Gmax与FC无关。随着细粉含量的增加，阻尼比呈压力依赖性下降，临界剪切应变幅值γ tl和γ tv略有增加。本文提出了考虑细粒含量影响的Gmax、Mmax、G（γ）/Gmax和D（γ）经验公式的推广。
The influence of a non-cohesive fines content on small-strain shear modulus G max, small-strain constrained elastic modulus M max, shear modulus degradation G (γ)/G max, damping ratio D (γ) and threshold shear strain amplitudes γ tl and γ 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 (γ)/G max were found rather independent of FC. A pressure-dependent decrease of the damping ratio and a slight increase of the threshold shear strain amplitudes γ tl and γ tv with fines content were measured. Extensions of several empirical equations for G max, M max, G (γ)/G max and D (γ) considering the influence of the fines content are proposed in the paper.