含水合物沉积物强度特性的三轴试验研究

刘芳; 寇晓勇; 蒋明镜; 熊巨华; 吴晓峰

含水合物沉积物强度特性的三轴试验研究 English Version

刘芳^{1, 2, 3},
寇晓勇^{1, 2, 4},
蒋明镜^{1, 2},
熊巨华^{1, 2},
吴晓峰^{1, 2}

1. 同济大学地下建筑与工程系，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. 广西岩土力学与工程重点实验室，广西桂林 541004; 4. 上海隧道工程股份有限公司，上海 200082

基金项目: 国家自然科学基金国家杰出青年科学基金项目（51025932）

详细信息

作者简介:
刘芳(1978- )，女，广东河源人，博士，讲师，主要从事砂土地震液化、天然气水合物力学性质测试及数值分析等方面的研究。E-mail: liufang@tongji.edu.cn。

中图分类号: TU411
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出版历程
- 收稿日期: 2012-12-19
- 发布日期: 2013-08-19

Triaxial shear strength of synthetic hydrate-bearing sediments

LIU Fang^{1, 2, 3},
KOU Xiao-yong^{1, 2, 4},
JIANG Ming-jing^{1, 2},
XIONG Ju-hua^{1, 2},
WU Xiao-feng^{1, 2}

1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin 541004, China; 4. Shanghai Tunnel Engineering Co., Ltd., Shanghai 200082, China

摘要

摘要: 针对含水合物沉积物基础力学试验数据相对缺乏的现状，分别采用通气法和预冻结法制备了含甲烷水合物和含四氢呋喃(THF)水合物的砂性沉积物试样，并通过低温高压三轴试验系统研究了含水合物沉积物的强度特性及其影响因素，重点分析了试样强度在不同水合物饱和度情况下的发展规律，并证实了试验反压的重要影响。结果表明：试样黏聚强度随水合物饱和度增加呈指数型增长。当水合物饱和度不高时(<50%)，试样内摩擦角变化不大；当饱和度较高时（>80%)，由于土颗粒咬合作用不能充分发挥，试样内摩擦角降低。另外，反压有助于提高水合物强度，从而提高含水合物沉积物的强度。
- 天然气水合物 /
- 海底沉积物 /
- 抗剪强度 /
- 三轴试验
Abstract: Due to the scarcity of basic data of hydrate-bearing sediments, a series of triaxial tests are made on synthetic samples of methane-hydrate-bearing and tetrahydrofuran-hydrate-bearing sandy sediments, which are generated using the gas-filtration method and the pre-freezing method, respectively. Attention is focused on the bulk strength of the specimens at different levels of hydrate saturation. The contribution attributed to the back pressure is confirmed by use of the experimental data. The results indicate that the cohesion exponentially increases with the increase of the hydrate saturation. No significant variation is found in the internal frictional angle of the specimens with low to medium hydrate saturation (<50%), while the angle decreases with the increase of the hydrate saturation due to less particle interlocking at high saturation (>80%). In addition, the back pressure helps to strengthen the hydrate in voids and thus causes an increase in the strength of the hydrate-bearing specimens.
- natural gas hydrate /
- marine sediment /
- shear strength /
- triaxial test

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参考文献(1)

[1]

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文章访问数: 547
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含水合物沉积物强度特性的三轴试验研究 English Version

作者简介: 刘 芳(1978- )，女，广东河源人，博士，讲师，主要从事砂土地震液化、天然气水合物力学性质测试及数值分析等方面的研究。E-mail: liufang@tongji.edu.cn。

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Triaxial shear strength of synthetic hydrate-bearing sediments

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目录

作者简介:
刘芳(1978- )，女，广东河源人，博士，讲师，主要从事砂土地震液化、天然气水合物力学性质测试及数值分析等方面的研究。E-mail: liufang@tongji.edu.cn。