EFFECTS OF DIFFERENT CONSOLIDATION CONDITIONS ON LIQUEFACTION RESISTANCE AND SMALL STRAIN QUASI-ELASTIC DEFORMATION PROPERTIES OF SANDS CONTAINING FINES
EFFECTS OF DIFFERENT CONSOLIDATION CONDITIONS ON LIQUEFACTION RESISTANCE AND SMALL STRAIN QUASI-ELASTIC DEFORMATION PROPERTIES OF SANDS CONTAINING FINES
复制标题
不同固结条件对含细砂抗液化及小应变准弹性变形性能的影响
DOI：
10.3208/sandf.41.6_53
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发表时间：
2001
影响因子：
3.7
通讯作者：
A. Ohta
中科院分区：
文献类型：
--
作者：
J. Koseki;A. Ohta
为了研究不同固结条件对粉细砂液化特性的影响，采用土与丰浦砂按95%：5%（干重）混合的方法，进行了一系列不排水循环三轴液化试验。一些试样在常温下各向同性固结1天、20天或100天，而另一些试样在将细胞水加热至60 ℃的同时固结2天或5天。还在常规温度下制备了OCR为2和4的过固结试样。在固结和循环三轴剪切过程中，对几个试件施加很小幅值的循环轴向荷载，测定了它们的准弹性变形特性。随着固结时间的延长、固结温度的升高以及超固结比的增大，抗液化强度均有所提高，但固结100 d的抗液化强度并不大于固结20 d的抗液化强度。另一方面，这种不同的固结条件影响的准弹性变形特性的变化以不同的方式。胶结作用的发展是在高温固结过程中发生的。各向异性程度的减少被认为是发生在超固结，这是伴随着在剪切的初始部分的负粘性的减少。
In order to investigate the effects of different consolidation conditions on liquefaction characteristics of sands containing fines, a series of undrained cyclic triaxial liquefaction tests was performed on artificial samples prepared by mixing Toyoura sand and bentonite at a ratio of 95% to 5% by dry weight. Some specimens were isotropically consolidated for 1, 20 or 100 days at a regular temperature, while the others were consolidated for 2 or 5 days while heating the cell water up to 60 degrees centigrade. Over-consolidated specimens with OCR of 2 and 4 were also prepared at a regular temperature. During consolidation and cyclic triaxial shearing of several specimens, their quasi-elastic deformation properties were measured while applying very small amplitude cyclic axial loads. Longer consolidation time, higher temperature during consolidation or higher ratio of over-consolidation resulted in an increase in the liquefaction resistance, with the exception that the liquefaction resistance of specimens consolidated for 100 days was not larger than that of specimens consolidated for 20 days. On the other hand, such different consolidation conditions affected the change in the quasi-elastic deformation properties in different manners. Development of cementation was suggested to have occurred during consolidation under high temperature. Reduction in the extent of anisotropy was suggested to have occurred during over-consolidation, which was accompanied by a decrease in the negative dilatancy at the initial part of shearing.