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Assessment of lumped particles effect on dynamic behaviour of fine and medium grained sands
Bulletin of Earthquake Engineering ( IF 4.6 ) Pub Date : 2021-01-03 , DOI: 10.1007/s10518-020-01012-w
Angshuman Das , Pradipta Chakrabortty , Radu Popescu

One novel aspect addressed here is the effect of the lumped particle on the dynamic behaviour of cohesionless soil. The effects of particle size and fines content on cyclic soil behaviour have been previously studied by mixing fine particles separately with cohesionless soil. The studied cohesionless soil in the quaternary alluvium deposit on Middle Ganga Plain in India contains a significant amount (10%–20%) of soil lumps. Therefore, the present study using strain-controlled cyclic triaxial tests addressed the effect of parameters mentioned above on the liquefaction resistance of sand where the fines were present in a lumped form. A series of undrained cyclic triaxial experiments have been performed on isotropically consolidated samples to quantify the effects of soil lumps present in various types of sand. Experimental results have shown less cyclic resistance for soil samples with lumps compared to clean sands of equivalent grain size. This is believed to be due to lumped particle crushing, and soil particle rearrangement during the sample saturation and loading. This affects dynamic properties such as shear modulus. From the results, it can be concluded that the presence of such soil lumps in cohesionless soil is reducing the initial shear modulus and the soil becomes more susceptible to liquefaction.



中文翻译:

集总颗粒对细粒和中粒砂动力学行为影响的评估

这里讨论的一个新颖方面是集总颗粒对无粘性土壤动力学行为的影响。先前已经通过将细颗粒与无粘性土壤分别混合来研究粒度和细粉含量对循环土壤行为的影响。在印度恒河平原中部第四纪冲积层中研究的无粘性土壤含有大量(10%–20%)的土壤团块。因此,本研究使用应变控制的循环三轴试验解决了上述参数对细粉以块状形式存在的砂的抗液化性的影响。对各向同性固结的样品进行了一系列不排水的循环三轴实验,以量化各种类型的砂土中土壤团块的影响。实验结果表明,与同等粒径的干净沙子相比,具有块状的土壤样品的循环阻力较小。据信这是由于集总颗粒破碎和样品饱和和加载过程中土壤颗粒重排所致。这会影响动态特性,例如剪切模量。从结果可以得出结论,在无粘性的土壤中这种土壤团块的存在降低了初始剪切模量,并且土壤变得更易于液化。

更新日期:2021-01-03
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