Influence of Non/Low-Plastic Fines and Associated Aging Effects on Liquefaction Resistance
Influence of Non/Low-Plastic Fines and Associated Aging Effects on Liquefaction Resistance
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DOI：
10.1061/(asce)gt.1943-5606.0000632
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发表时间：
2012-06
影响因子：
3.9
通讯作者：
T. Kokusho;Fumiki Ito;Y. Nagao;A. Green
中科院分区：
文献类型：
--
作者：
T. Kokusho;Fumiki Ito;Y. Nagao;A. Green
本文提出的研究目的是发展对非/低塑性细粒和相关老化效应对沙土渗透阻力（qt）和液化阻力（RL）的影响的理解。为此，作者对具有不同相对密度（Dr）和细粒含量（Fc）的样品进行了一系列循环三轴试验，其中一个微型锥体被纳入三轴装置。这样就可以直接测定样品的渗透阻力和液化阻力。为了模拟地质老化效应，在样品制备过程中向土壤中掺入少量水泥。从没有水泥的“未老化样品”中，我们发现尽管RL和qt都随着Fc的增加而降低，但RL和qt之间存在一种独立于Fc的独特关系。然而，对于具有相同Cc / Fc（即模拟相同地质年龄）的样品，发现相同qt的RL随Fc的增加而增加，这一趋势与自然土壤沉积物的现场RL-qt相关性一致，其中老化效应是内在的。因此，已经澄清的是，对于给定的qt，不是Fc值本身，而是与较高Fc相关的胶结效应导致较高的液化阻力。DOI: 10.1061/(ASCE)GT.1943-5606.0000632。©2012美国土木工程师学会。欧洲经委会数据库主题标题：土壤液化；锥体穿透试验；老化(材料);三轴测试;水泥。关键词：抗液化；锥抵抗;罚款内容;老化效应;三轴试验;胶结;水泥的内容。
The objective of the study presented herein is the development of an understanding of the influence of non/low-plastic fines and associated aging effects on the penetration resistance (qt) and liquefaction resistance (RL) of sandy soils. Towards this end, the authors performed a series of cyclic triaxial tests on samples having varying relative densities (Dr) and fines contents (Fc), wherein a miniature cone was incorporated into the triaxial apparatus. This allowed the penetration resistance and the liquefaction resistance to be determined directly for the samples. To simulate geologic aging effects, a small amount of cement was mixed in with the soil during sample preparation. From "unaged samples" without cement, it was found that although both RL and qt decrease as Fc increases, a unique relationship exists between RL and qt that is independent of Fc. However, from samples having the same Cc∕Fc (i.e., simulating the same geologic age), it was found that RL increases as Fc increases for the same qt. This trend is consistent with field-based RL-qt correlations for natural soil deposits to which aging effects are intrinsic. Thus, it has been clarified that it is not the Fc-value by itself but rather the cementation effect associated with higher Fc that results in a higher liquefaction resistance for a given qt. DOI: 10.1061/(ASCE)GT.1943-5606.0000632. © 2012 American Society of Civil Engineers. CE Database subject headings: Soil liquefaction; Cone penetration tests; Aging (material); Triaxial tests; Cement. Author keywords: Liquefaction resistance; Cone resistance; Fines content; Aging effect; Triaxial test; Cementation; Cement content.