Deformation and failure behavior of carbon dioxide hydrate-bearing sands with different hydrate contents under triaxial shear tests

WEI Hou-zhen; YAN Rong-tao; CHEN Pan; TIAN Hui-hui; WU Er-lin; WEI Chang-fu

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Deformation and failure behavior of carbon dioxide hydrate-bearing sands with different hydrate contents under triaxial shear tests

更新时间：2026-06-25

- Deformation and failure behavior of carbon dioxide hydrate-bearing sands with different hydrate contents under triaxial shear tests
- Vol. 32, Issue S2, (2011)
- 作者机构：
  
  中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉,430071
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU443
- Online First：26 August 2011，
  
  Published：2011
- 稿件说明：
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WEI Hou-zhen, YAN Rong-tao, CHEN Pan, et al. Deformation and failure behavior of carbon dioxide hydrate-bearing sands with different hydrate contents under triaxial shear tests[J]. 2011, 32(S2).
DOI：

WEI Hou-zhen, YAN Rong-tao, CHEN Pan, et al. Deformation and failure behavior of carbon dioxide hydrate-bearing sands with different hydrate contents under triaxial shear tests[J]. 2011, 32(S2). DOI：

摘要

天然气水合物是一种战略性替代能源，又是全球气候环境问题和地质灾害的诱发因素之一。研究含天然气水合物沉积物的变形和强度等力学特性成为保障天然气水合物开发利用中工程与环境安全的重要一项研究内容。通过不同初始含水率控制试样的水合物含量的方法，开展不同水合物含量的粉质砂的三轴剪切试验，研究水合物含量对赋存介质的强度与变形特性的影响。试验结果表明，水合物在砂样中的填充与胶结作用，使得含水合物试样的剪切模量明显增加，进一步采用双曲线模型对各试样初始模量的计算与分析后发现，相同净围压下，随着水合物含量增加，试样的初始剪切模量具有上升趋势，但上升趋势变缓；试样强度随水合物含量增加而增大，但水合物含量高的试样破坏峰值强度与净围压并不是线性关系，净围压越大其峰值强度相应偏小；通过摩尔-库仑定律得出的试样强度指标可知，试样内摩擦角随水合物含量增加而增大，但增加幅度不大，但水合物含量31.0%和51.0%试样的与含水合物0%和19.7%试样相比，前2组试样具有较大黏聚力c值。因此，水合物对试样强度增长的贡献主要是其在试样中的胶结作用产生，且其对强度影响还受含量和赋存形态的控制

Abstract

Natural gas hydrate is one of the most important potential energy sources

which is a triggering factor of global climate change and geologic hazards. It is necessary to research engineering characteristic of hydrate-bearing sediment to insure the exploiture of hydrate successfully.A triaxial shear apparatus devoloped by ourselves was used to test the deformation and failure behaviors of sand with different hydrate content controled by different original water content. As a result

it is found that the shear modulus of hydrate-bearing sand increased sharply because of samples filled and cemented by hydrate in pore

and original shear modulus of samples increased with increment of hydrate content at the same confining pressure in hyperbolic model. Friction angle increases with increment of hydrate contents slightly; however compared with the samples contained 31.0% and 51.0% hydrate

cohesion of the former two groups are much more than the latter two.Thus the constribution of strength increment is the cementation of hydrate on grains

and the effect is controlled by content and distribution of hydrate in samples.

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