Effects of loess content on dynamic shear modulus and damping ratio of Taiyuan sand
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摘要: 太原地铁2号线沿线黄土与太原砂混合料广泛分布,迫切需要该粉质砂土的动剪切模量G与阻尼比R进行场地地震反应分析。利用英国GDS公司研制的共振柱对不同黄土含量LC的重塑粉质砂土样进行了测试。试验结果表明：随着LC的增大,混合料受力骨架由砂粒向土粒转变,这是导致不同LC混合料性质差异的主要原因。混合料G随LC的增大呈现先减小后增大的趋势,λ则相反,且存在明显阈值黄土含量LCth,饱和状态与干状态下试样的LCth不同。干状态下,混合料与太原砂的G和λ的大小关系与LC有关。饱和状态下,由于黄土塑性,混合料的G小于太原砂,其λ大于太原砂。Abstract: The mixtures of loess and Taiyuan sand are distributed widely along the No. 2 metro line of Taiyuan, which leads to an urgent need for the dynamic shear modulus G and damping ratio λ to analyze the seismic response. The resonant column tests on remodeling silty sand with various loess contents (LC) are conducted by the GDS-RCA apparatus made by GDS Instruments Ltd. from the UK. The results show that the load bearing frame of the mixtures is changed from sand to soil particle with the increase of LC, which leads to the property difference of the mixtures with various LCs. The G of the mixtures decreases firstly and then increases with the increase of LC. However, the change of λ is opposite. The threshold loess content LCth exists obviously. The LCth of the saturated and dried samples is different. The size relationship between the G and λ of mixtures and Taiyuan sand is dependent on the LC in the dried state. As for the loess plasticity, the G of the mixtures is smaller than that of Taiyuan sand, and the λ of the mixtures is larger than that of Taiyuan sand in the saturated state.
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Keywords:
- Taiyuan metro /
- silty sand /
- resonant column test /
- loess content /
- dynamic shear modulus /
- damping ratio
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