Consolidation Deformation Characteristics of Hachirogata Clay Ground
Consolidation Deformation Characteristics of Hachirogata Clay Ground
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八方粘土地基固结变形特征
DOI：
10.11362/jcssjnendokagaku.59.1_10
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
倉島 栄一
中科院分区：
文献类型：
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作者：
金山 素平;高橋 長仁;山本 清仁;武藤 由子;倉島 栄一
为了评价八方粘土的变形特性，进行了一维固结试验等土工试验。虽然从粒度测试结果来看，该八代方粘土样品含有较多的砂和较少的粘土，但发现该样品具有较高的液限、塑性指数和天然含水量。关于固结试验得出的参数，体积压缩系数、固结系数和渗透系数的范围分别为10− 4-10− 2 m2/kN、5-100 cm 2/d和10− 9-10− 7 cm/s。与其他粘土样品相比，八方粘土具有较低的固结速率和渗透性，较高的体积压缩性。此外，作为分析次固结行为的结果，其中应变在恒定载荷下进行，它被发现，八郎方粘土具有较高的次固结速率。此外，假设由八方粘土构成的虚拟地基，在该虚拟地基上施加与土压力对应的路堤荷载时，计算了理论曲线和考虑次固结变形量的沉降曲线。计算所需的土壤常数是从该固结试验中获得的常数。有人澄清说，它需要很长的时间来完成主固结，和沉降增加时，次固结开始早。
In this work, to evaluate the deformation characteristics of Hachirogata clay, soil tests such as one dimensional consolidation test and so on were conducted. Although this Hachirogata clay sample contained much sand and less clay from the grain size test result, it was found that the sample has high liquid limit, plasticity index, and natural water content. About the derived parameters from the consolidation test, the coefficient of volume compressibility, the coefficient of consolidation, and the coefficient of permeability were in the range of 10− 4–10− 2 m 2/kN, 5–100 cm 2/d and 10− 9–10− 7 cm/s, respectively. Compared with other clay samples, Hachirogata clay had low consolidation rate and permeability and high volume compressibility. Furthermore, as a result of analyzing the secondary consolidation behavior in which the strain progresses under a constant load, it was found that Hachirogata clay has high secondary consolidation rate. In addition, assuming the virtual ground composed of Hachirogata clay, the theoretical curve, and the settlement curve considering the secondary consolidation deformation amount were evaluated when the embankment load corresponding to the earth pressure was loaded on this virtual ground. The soil constant required for the calculation was the constant obtained from this consolidation test. It was clarified that it takes a long time to complete primary consolidation, and that the settlement increases when secondary consolidation starts early.