南海软土微观结构与力学特性试验研究

蒋明镜; 李志远; 黄贺鹏; 刘俊

doi:10.11779/CJGE2017S2005

南海软土微观结构与力学特性试验研究 English Version

蒋明镜^{1, 2, 3},
李志远^{2, 3},
黄贺鹏^{2, 3},
刘俊^{2, 3}

1. 土木工程防灾减灾国家重点实验室,上海 200092;
2. 同济大学岩土及地下工程教育部重点实验室,上海 200092;
3. 同济大学土木工程学院地下建筑与工程系,上海 200092

基金项目: 国家自然科学基金重点项目（51639008）; 山东省重点实验室开放基金项目（MEGE-1602）

详细信息

作者简介:
蒋明镜(1965- ),男,教授,同济大学特聘教授、博士生导师,主要从事天然结构性黏土、砂土、太空土、非饱和土和深海能源土的宏微观试验、本构模型和数值分析等方面的研究工作。E-mail: mingjing.jiang@tongji.edu.cn。

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出版历程
- 收稿日期: 2017-08-01
- 发布日期: 2017-12-19

Experimental study on microstructure and mechanical properties of seabed soft soil from South China Sea

JIANG Ming-jing^{1, 2, 3},
LI Zhi-yuan^{2, 3},
HUANG He-peng^{2, 3},
LIU Jun^{2, 3}

1. State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai, 200092, China;
2. Key Laboratory of Geotechnical and Underground Enigineering of Ministry of Education, Tongji University, Shanghai, 200092, China;
3. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China

摘要

摘要: 针对南海原状土力学性质的研究对于南海油气资源开发具有重要意义。对南海陆坡区所取的软土试样,通过物理试验和X-射线衍射试验,分析了该土样的物化特性;通过一维固结试验和常规三轴压缩试验,探究了该原状土的压缩及剪切特性;借助扫描电子显微镜,分析了土体的微观结构特征。试验结果显示：该土体为高液限粉土,具有高含水率、高孔隙比和高饱和度的特点;土体的黏土矿物中伊利石含量最高,其胶体活动指数高;土体为欠固结土,在固结试验中表现出一定的结构性,在剪切试验中呈现应变硬化特征;土体微观上呈开放式的絮凝结构,骨架松散,颗粒定向度较低。
- 南海 /
- 软土 /
- 微观结构 /
- 压缩 /
- 剪切
Abstract: Experimental researches on undisturbed soil samples are of great significance for the oil and gas exploitation in South China Sea. The physical and chemical properties of seabed soil in the slope area of South China Sea are studied by using the physical and X-ray diffraction tests. The consolidation and shearing properties are studied by means of the one-dimensional oedometer and conventional triaxial compressive tests. The microstructure is observed by the scanning electron microscope. The results show that the silts are the main compositions, and the soil is of high liquid limit, high void ratio and high saturation. Besides, the soil has large activities, with illite as the primary clay mineral. The soil is under-consolidated and shows traces of structural performance in consolidation tests and strain-hardening behavior in direct shear and conventional compressive triaxial tests. The soil is of flocculated microstructure which has a loose skeleton and weakly ordered grains.
- South China Sea /
- soft soil /
- microstructure /
- compression /
- shearing

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参考文献(8)

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