黏土水合物沉积物力学特性及应力应变关系

发布时间：2018-04-23 16:45

  本文选题：黏土水合物沉积物 + 应力应变曲线　； 参考：《中国海洋大学学报(自然科学版)》2017年10期

【摘要】：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。
[Abstract]:The marine silty clay in a natural gas hydrate (hydrate) area off the coast of China was used to prepare the hydrate sediment samples. The stress-strain curves and failure stress characteristics of the samples were analyzed by means of a geotechnical triaxial apparatus. The results show that the mechanical constants such as the failure stress (the strain is 15%) increase with the increase of hydrate saturation, and jump when the saturation is about 25%. That is, the change of failure stress with hydrate saturation can be divided into two parts. When the saturation is less than 25, the existence of hydrate has little effect on the failure stress of sediment, and more than 25. In the range of hydrate saturation less than 45%, the stress-strain curves of hydrate sediments can be divided into elastic section, yield section and strengthening section. A piecewise function describing the stress-strain curve is given.
【作者单位】： 中国科学院力学研究所;中国科学院大学工程科学学院;广州海洋地质调查局;
【基金】：中国地质调查局项目(GZH2011003) 国家自然科学基金项目(11072245,41376078)资助~~
【分类号】：P741;TU41
，

本文编号：1792787