Journal of Experiental Mechanicals

含水合物黏土的力学性质试验研究

Experimental study of mechanical properties of hydrate clay

Received:October 24, 2016 Revised:March 30, 2017

英文关键词:tetrahydrofuran hydrate clay hydrate clay stress-strain strength

基金项目:国家自然科学基金(No.11072245， 51239010， 41376078),中国地质调查局DD20160217-1和中石油-中科院高端战略联盟计划(2015A-4813)资助

Author Name	Affiliation
WANG Shu-yun*	Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
LUO Da-shuang	Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
ZHANG Xu-hui	Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
LU Xiao-bing	Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
SHI Yao-hong	Guangzhou Marine Geological Survey, Guangzhou 510075, China

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中文摘要:

基于含四氢呋喃水合物黏土样品在不同水合物饱和度、围压及水合物分解前后的高压三轴剪切试验和超声波测量数据，分析了含水合物黏土的应力-应变关系和强度特性。试验结果表明：(1)含水合物黏土的应力-应变曲线展现出弹性、塑性变形以及应变硬化三个阶段(在应变低于1.5%时近似为弹性，在应变2%~6%范围内表现为塑性，在大于6%后呈现明显的应变硬化特性)，与不含水合物黏土的应力-应变关系有明显不同；(2)含水合物黏土在水合物分解前后的应力-应变关系存在明显的不同,水合物分解后比水合物分解前的不排水强度值降低程度最大为50%； (3)含水合物黏土的不排水抗剪强度随水合物饱和度和围压的增加而增大，并比不含水合物黏土的强度提高1~6倍。上述结果表明水合物的存在增强了黏土颗粒之间的连结或胶结作用。

英文摘要:

Based on a series of high compression static tri-axial shear experiment and ultrasonic wave measurement data of tetrahydrofuran hydrate clay samples under the condition of different hydrate saturation, confining pressure and before and after hydrate decomposition, the stress-strain relation and strength characteristics of hydrate clay were analyzed. Experimental results show that (1) the stress-strain curve of hydrate clay presents three stages, i.e. approximately elastic stage (when strain is less than 1.5%), plastic deformation stage (when strain is in a range of 2% and 6%) and obvious strain hardening stage (when strain is greater than 6%), which indicate obvious difference of stress-strain relation compared with that of clay without hydrate; (2)there is a distinct difference in stress strain relationship of hydrate clay before and after hydrate decomposition, compared with the clay before hydrate decomposition, the maximum reduction of undrained strength of hydrate clay after hydrate decomposition is 50%; (3)the undrained shear strength of hydrate clay increases with the increase of hydrate saturation and confining pressure, and the strength of hydrate clay is 1~6 times higher than that of clay without hydrate. Above results demonstrate that the presence of hydrate enhances the bonding or cementation among clay particles.

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