...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Cold regions science and technology >Shear strength of frozen sand with dissociating pore methane hydrate: An experimental study
【24h】

Shear strength of frozen sand with dissociating pore methane hydrate: An experimental study

机译：解离孔隙甲烷水合物的冻砂剪切强度：实验研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This paper presents experimental results for peak shear strength of frozen sand containing methane hydrates within the pore space under dissociation at atmospheric pressure. During the experiments, the samples retained metastable pore methane hydrate due to the self-preservation effect. The tested samples were subjected to short-term uniaxial compression at temperatures from -1.8 to -6.5 degrees C. The gas hydrate component turned out to considerably affect the strength of the host frozen soil: the shear strength of frozen sediments decreased as saturation with metastable gas hydrate became lower. There is some critical hydrate saturation value (similar to 30%) below, which no further strength reduction occurs. Cyclic thawing-freezing increases considerably the strength of frozen samples that contain relict hydrates, primarily because denser ice, with fewer structural defects, forms by freeze back instead of molten porous hydrate-bearing ice. The obtained results indicate that geomechanical properties of frozen sediments correlate with the contents of relict gas hydrate and can be used for detection of hydrate-bearing permafrost layers.
机译：本文介绍了在常压下解离孔腔内含甲烷水合物的冷冻砂的峰值剪切强度的实验结果。在实验过程中，由于自保存效应，样品保留了亚稳态的孔甲烷水合物。被测样品在-1.8至-6.5摄氏度的温度下进行了短期单轴压缩。气体水合物组分的确对宿主冷冻土壤的强度产生了重大影响：冷冻沉积物的剪切强度随着亚稳的饱和而降低天然气水合物含量降低。下面有一些临界水合物饱和度值（大约30％），不会进一步降低强度。循环融化冻结大大提高了含有残留水合物的冷冻样品的强度，这主要是因为通过回冻而不是熔融的含多孔水合物的冰形成了具有较少结构缺陷的致密冰。所得结果表明，冻结沉积物的地质力学性质与残留天然气水合物的含量有关，可用于含水合物的多年冻土层的检测。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号