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Investigation of the Physical, Chemical and Mechanical Properties of Ariake Clay under the Reclamation Dick and Analysis of the Behavior of the Reclamation Dike by Finite Element Method

围垦堤下有明粘土的物理、化学和力学性能研究及围垦堤行为的有限元分析

基本信息

批准号：
13660245
负责人：
HIGASHI Takahiro
金额：
$ 2.3万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

The physical, chemical and mechanical properties of Ariake clays under/around the reclamation dikes were examined based on core boring data and soil test results. The following main results were obtained : (1) Ariake clay layers under the reclamation dike are normally consolidated and the consolidation settlement of the alluvial Ariake clay layer is considerably larger than that of the deeper layers. (2) There is the unique relation between fall cone penetration depth and vane shear strength for undisturbed Ariake clays. Liquid limit (W_<Lf>) obtained by fall cone method is well coincident with that (W_L) obtained by JIS method in W_L≦100% and the difference between rLf and W_L increases with the increase of W_L in W_L>100%. (3) The rates of strength increase and the internal friction angles of remolded Ariake clays were 15〜20, 5〜20% greater than those of undisturbed ones respectively. The grain size distribution of Ariake clay has an effect on Hvorslev's strength parameters. Irreversibility ratio (Λ) of Ariake clay is in the range of 0.6〜0.8 and is not affected with grain size distribution and plasticity index (I_p). (4) The results of the consolidation test using constant rate of strain loading for remolded Ariake clays are independent on strain rate. To the contrary, the consolidation yield stress of undisturbed Ariake clays is dependent on strain rate.Moreover, the behavior analyses of the reclamation dike in the field and of the footing in the centrifuge model test using the elasto-plastic finite element method were carried out. It was found from the comparisons of the results of these analyses with those of the field observation and with those of the centrifuge model test that this analysis method was sufficiently applicable to the behavior analysis of the reclamation dike on the soft ground.

根据岩心钻探资料和土工试验结果，对填海堤防下和围堤周围的阿里亚克粘土的物理、化学和力学性质进行了研究。主要研究成果如下：(1)围海堤下的阿里亚克粘土层一般处于固结状态，冲积的阿里亚克粘土层的固结沉降量明显大于深层。(2)原状Ariake粘土的落锥贯入深度与叶片抗剪强度之间存在着独特的关系。落锥法得到的液限(W&lt；Lf&gt；)与JIS法得到的液限(W_L)在W_≦为100%时有很好的一致性，且在W_L&gt；100%时，随着W_L的增加，两者的差值增大。(3)重塑后的有明粘土的强度增长速率比原状粘土提高了15~20%，内摩擦角提高了5~20%。阿里亚克粘土的粒度分布对Hvorslev强度参数有影响。阿里亚克粘土的不可逆比(Λ)在0.6~0.8之间，不受粒度分布和塑性指数(Ip)的影响。(4)等应变加载固结试验结果与应变率无关。与之相反，原状阿里亚克粘土的固结屈服应力依赖于应变率，并采用弹塑性有限元方法对现场填海堤防和离心机模型试验中的地基性状进行了分析。将这些分析结果与现场观测结果和离心机模型试验结果进行了比较，结果表明，该分析方法完全适用于软土地基上填海堤防的性态分析。