黏土水合物沉积物力学特性及应力应变关系
Mechanical Properties of Hydrate-Bearing Silty-Clay and Stress-Strain Relation
查看参考文献14篇
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文摘
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以中国近海某天然气水合物(水合物)区的海底粉质黏土制备水合物沉积物样品,并在土工三轴仪上进行实验,分析其应力应变曲线和破坏应力特性。结果表明:力学常数如破坏应力(应变为15%对应的偏应力)随水合物饱和度的增加而增加,在饱和度约25%时破坏应力产生跳跃,即破坏应力随水合物饱和度的变化可分为两部分,饱和度小于25%时水合物的存在对沉积物破坏应力影响较小,大于25%时影响较大。在水合物饱和度小于45%的范围内,水合物沉积物的应力应变曲线可分为弹性段、屈服段和强化段。文中给出了描述其应力应变曲线的分段函数。 |
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其他语种文摘
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Triaxial tests were carried out to study the stress-strain characteristics of tetra-hydro-furan (THF)hydrate-bearing sediment by using the silty-clay sampled as skeleton from China's offshore area. It is shown that the failure stresses(the variational stress at strain 15%)increase with hydrate saturation and there a jump at strain 25%.In other words,the relation between failure stress and saturation can be divided into two stages:the effects of hydrate saturation are small when the strain is less than 25% while it is large at strain exceeding 25%.The strain-strain curve can be divided into three stages: elastic stage,failure stage and strengthening stage.A subsection function is used to describe the stressstrain curve.The stress-strain curve can be divided into three stages:linear stage,failure stage and strengthening stage at strain 0~45%.Piecewise function was used to describe the relation. |
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来源
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中国海洋大学学报. 自然科学版
,2017,47(10):9-13 【核心库】
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DOI
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10.16441/j.cnki.hdxb.20160474
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关键词
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黏土水合物沉积物
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应力应变曲线
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破坏应力
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地址
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1.
中国科学院力学研究所, 北京, 100190
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广州海洋地质调查局, 广州, 510075
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1672-5174 |
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学科
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建筑科学 |
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基金
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国土资源部中国地质调查局项目
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国家自然科学基金项目
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文献收藏号
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CSCD:6086678
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