土工基础

土工基础 ›› 2020, Vol. 34 ›› Issue (5): 621-624.

• 测试技术 • 上一篇    下一篇

含四氢呋喃水合物沉积物无侧限压缩试验研究

汤 沁1，李 杨2，颜荣涛1   

  1. （ 1.桂林理工大学 广西建筑新能源与节能重点实验室，广西桂林 541004;2.四川志德岩土工程有限责任公司，成都 610000）
  • 收稿日期:2019-11-15 修回日期:2020-11-30 出版日期:2020-10-20 发布日期:2020-11-02
  • 通讯作者: 颜荣涛（1984-），男，博士，教授，研究方向为天然气水合物关键岩土工程的研究。
  • 作者简介:汤 沁（1994-），女，硕士研究生，研究方向为含天然气水合物沉积物力学。
  • 基金资助:
    广西自然科学基金(No.2017GXNSFAA198215)；国家自然科学基金（No.11962004，No.11562007)

Unconfined Compression Test of THF Hydrate Bearing Sediments

TANG Qin1, LI Yang2, YAN Rongtao1   

  1. (1.Guangxi Key Laboratory of New Energy and Building Energy Conservation, Guilin University of Technology, Guilin 541004;
    2.Sichuan Zhide Geotechnical Engineering Co. Ltd., Chengdu 610000)
  • Received:2019-11-15 Revised:2020-11-30 Online:2020-10-20 Published:2020-11-02

摘要： 参考南海神狐海域SH2站点含水合物地层沉积物颗粒级配分析结果，人工配置试验土骨架，制备不同水合物饱和度（0%，40%，50%，60%）的含四氢呋喃水合物沉积物试样，并在低温环境下进行无侧限压缩试验，获得了不同水合物饱和度试样的应力应变曲线、刚度和强度。结果表明，试样的应力应变曲线呈现应变软化现象，随着水合物饱和度的增加，软化现象更为明显；水合物能够显著增加试样的弹性模量，并随着水合物饱和度的增大而增大；随着水合物饱和度的增加，试样的无侧限抗压强度呈指数增加，与三轴和直剪试验所测得强度的趋势一致。

关键词: 南海, 水合物沉积物, 应力应变曲线, 弹性模量, 无侧限抗压强度

Abstract: In this study, the unconfined compressive tests at low temperature conditions were conducted on the artificial THF hydratebearing sediment samples under four different hydrate saturations (0%, 40%, 50%, 60%). The sediment skeleton was prepared according to the drilling results of SH2 station in South China Sea. The results show that, the stressstrain curve of samples have a large strain soften in shape, which is more obvious with the increase of hydrate saturation. The intergranular hydrate significantly increases the elastic modulus which shifts to higher area with the increase of hydrate saturation. Besides, with the increase of hydrate saturation, the unconfined compressive strength of samples increases exponentially, which is consistent with the trend of strength measured by triaxial and direct shear tests.

Key words: South China Sea, HydrateBearing Sediments, Stress-Strain Curves, Elasticity Modulus, Unconfined Compressive Strength

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