| 不同制样方式下含水合物粉细砂静力学特性研究 |
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| 引用本文： | 王兆祥,赵志超,王栋,孔壮壮,吴杨.不同制样方式下含水合物粉细砂静力学特性研究[J].海洋工程,2020,38(6):117-123. |
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| 作者姓名： | 王兆祥 赵志超 王栋 孔壮壮 吴杨 |
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| 作者单位： | 中国海洋大学 环境科学与工程学院, 山东 青岛 266100;山东省海洋环境地质工程重点实验室, 山东 青岛 266100;广州大学 土木工程学院, 广东 广州 510000 |
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| 基金项目： | 中央高校基本业务经费项目（201962013）；国家自然科学基金项目（41772294） |
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| 摘 要： | 利用高压低温三轴仪对含水合物粉细砂进行剪切试验。分别用气饱和法与水饱和法制样，实现不同水合物饱和度和围压条件的三轴剪切，并分析含水合物砂的胶结作用对剪切特性的影响。试验结果表明：低饱和度时，气饱和与水饱和试样的偏应力差别不大；高饱和度时，制样方式对偏应力的影响较显著；水饱和试样的剪胀性大于气饱和试样，剪胀性随饱和度的升高和围压的降低而增大。峰值偏应力和稳态偏应力由黏聚力和摩擦力两部分组成，水合物的存在对稳态内摩擦角影响不大。
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| 关 键 词： | 甲烷水合物 粉细砂 三轴试验 制样方法 力学性质 |
| 收稿时间： | 2019/11/4 0:00:00 |
Static characteristics of hydrate-bearing fine sands with different sampling methods |
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| WANG Zhaoxiang,ZHAO Zhichao,WANG Dong,KONG Zhuangzhuang,WU Yang.Static characteristics of hydrate-bearing fine sands with different sampling methods[J].Ocean Engineering,2020,38(6):117-123. |
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| Authors: | WANG Zhaoxiang ZHAO Zhichao WANG Dong KONG Zhuangzhuang WU Yang |
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| Institution: | College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China;Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Qingdao 266100, China; College of Civil Engineering, Guangzhou University, Guangzhou 510000, China |
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| Abstract: | The behaviors of methane hydrate-bearing fine sand were studied using high-pressure low-temperature triaxial compression tests. The soil samples under a variety of saturations and confining pressures were prepared by gas saturation and water saturation, respectively, and the effect of cementation on shear characteristics of samples was analyzed. It was observed that at low saturation of methane hydrate, the deviator stresses of samples prepared by gas saturation and water saturation were close to each other, however, the dilatancy of the former was lower than the latter. The dilatancy became more significant with the increase of saturation and decrease of confining pressure. The deviatoric stress at high saturation of methane hydrate depends seriously on the sampling method. The peak deviatoric stress and residual deviatoric stress were both increased with saturation and confining pressure, which may be described through two properties, the cohesion and internal frictional angle. The internal friction angle at steady states were varied in a narrow range for all tests. |
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| Keywords: | methane hydrate fine sand triaxial test sampling approaches mechanical property |
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