Investigation of the effect of frequency on shear strength and damping of pure sand and sand stabilised with rice husk ash using cyclic triaxial tests

IF 0.8 Q4 ENGINEERING, CIVIL Advances in Civil and Architectural Engineering Pub Date : 2023-03-04 DOI:10.13167/2023.26.3
Maysam Salimzadehshooiili
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Abstract

Rice husk ash (RHA), owing to its pozzolanic properties and wide abundance, is an additive that can be used as an alternative to cement to improve a variety of soils. Damping and shear modulus are two important soil dynamic parameters used to predict soil behaviour under dynamic loading. Therefore, in this study, materials were prepared and their specifications were determined. A cyclic triaxial device was used to determine the dynamic parameters (stress control). Subsequently, the results related to shear modulus and damping calculated for pure sand before and after stabilisation were analysed according to different percentages of stabilisers for two frequencies of 0.5 and 1 Hz. The results revealed the effect of different frequencies on the damping of pure sand, which differed for stabilised sand. In all stabilised specimens, the shear modulus decreased with increasing frequency. Additionally, the damping decreased with increasing frequency in the stabilised samples. The shear modulus increases with the increase in the amount of stabilisers. The results also showed the positive effect of partially replacing cement with RHA.
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用循环三轴试验研究频率对纯砂和稻壳灰稳定砂抗剪强度和阻尼的影响
稻壳灰(RHA),由于其火山灰性质和广泛丰度,是一种添加剂,可以作为水泥的替代品,以改善各种土壤。阻尼和剪切模量是两个重要的土动力参数,用于预测土在动力荷载作用下的性能。因此,本研究准备了材料并确定了材料的规格。采用循环三轴装置确定动态参数(应力控制)。随后,在0.5 Hz和1 Hz两个频率下,根据稳定剂的不同比例,分析了稳定前后纯砂的剪切模量和阻尼计算结果。结果表明,不同频率对纯砂阻尼的影响,对稳定砂的影响有所不同。在所有稳定试样中,剪切模量随频率的增加而减小。此外,在稳定的样品中,阻尼随频率的增加而降低。剪切模量随稳定剂用量的增加而增大。结果还显示了RHA部分替代水泥的积极效果。
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