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Research into Structure and Long-term Settlement of Osaka Bay Clay

大阪湾粘土的结构与长期沉降研究

基本信息

批准号：
14350248
负责人：
SHIBUYA Satoru
金额：
$ 8.9万
依托单位：
Kobe University (2004)Hokkaido University (2002-2003)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

Most, natural, sedimentary clay becomes stiffer and stronger as it ages. Similarly, a clay mixed with cement hardens with time due to the development of fabric bonding caused by chemical (i.e., pozzolan) reaction. Such fabric bonding may also occur to some degree in natural ground with a high CO_3 content.In this research, these naturally and artificially cemented clays are regarded as "structured" to the comparable behavior of a reconstituted sample, bearing in mind that the mechanical behavior of such clays is noticeably less compressible, stiffer and stronger. The mechanical behavior of natural sedimentary clay clay is different from the comparable behavior of the reconstituted sample as the consequence of structuration induced over the geological period due to natural conditions or rather quickly due to the addition of chemical bonding in fabrics. In this paper, the mechanical behavior of such "structured" clays as highlighted by reduced compressibility, higher stiffness and higher strength was carefully examined in the laboratory.In comparing the elastic shear modulus at very small strains, G between each structured clay and the reconstituted sample, the clay structure was evaluated quantitatively by metastability index MI(G) proposed by Shibuya (2000). The stress-strain and strength behavior when subjected to undrained shear in compression was also simulated by the so-called super/subloading yield surface (SYS) Cam clay model proposed by Asaoka et al. (2000, 2002).

大多数天然沉积粘土随着年龄的增长会变得更硬更强。类似地，与水泥混合的粘土由于由化学（即，火山灰）反应。在本研究中，这些天然和人工胶结的粘土被认为是“结构化的”，以一个重构的样品的类似行为，记住，这样的粘土的力学行为是明显较小的可压缩性，刚性和强度。天然沉积粘土的力学行为与重构样品的类似行为不同，这是由于自然条件导致的地质时期结构化的结果，或者由于织物中添加化学键而导致的结构化相当快。本文在实验室中仔细研究了这种“结构性”粘土的力学行为，即压缩性降低、刚度增加和强度增加，通过比较每种结构性粘土和重构样品在非常小的应变下的弹性剪切模量G，用涩谷（2000）提出的亚稳指数MI（G）定量评价了粘土的结构性。在压缩条件下，采用Asaoka等（2000，2002）提出的超/次加载屈服面Cam粘土模型模拟了不排水剪切时的应力-应变和强度特性。