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| 含甲烷水合物松散沉积物的力学特性 |
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李彦龙1,2,刘昌岭1,2,刘乐乐1,2,陈强1,2,胡高伟1,2
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(1.青岛海洋地质研究所国土资源部天然气水合物重点实验室,山东青岛 266071;2.海洋国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛 266071)
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| 摘要: |
| 通过含甲烷水合物松散沉积物三轴测试,首次基于临界状态原理探讨水合物沉积物发生应变软化、硬化破坏形式的机制,重点分析各强度参数变化规律及其对破坏模式的敏感性。结果表明:三轴剪切试验过程中沉积物破坏模式受有效围压、水合物饱和度等因素共同控制;破坏模式对峰值强度、起始屈服强度、起始屈服模量、内聚力、内摩擦角等参数的影响较小;不同破坏模式条件下水合物沉积物切线模量、峰值剪切模量等参数变化规律完全不同,其计算模型须在不同破坏模式框架内分别分析,而不能忽略破坏模式的影响建立笼统的水合物沉积物强度参数计算模型。 |
| 关键词: 松散沉积物 甲烷水合物 三轴试验 应变软化 应变硬化 |
| DOI：10.3969/j.issn.1673-5005.2017.03.013 |
| 分类号::P 744 |
| 文献标识码:A |
| 基金项目:国家自然科学基金项目(41606078,8);中国科学院天然气水合物重点实验室开放基金项目(Y607ke1001) |
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| Mechanical properties of methane hydrate-bearing unconsolidated sediments |
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LI Yanlong1,2, LIU Changling1,2, LIU Lele1,2, CHEN Qiang1,2, HU Gaowei1,2
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(1.The Key Laboratory of Gas Hydrate, Ministry of Land and Resources, Qingdao Institute of Marine Geology, Qingdao 266071, China;2.Qingdao National Laboratory for Marine Science and Technology, State Key Laboratory for Marine Mineral Resources, Qingdao 266071, China)
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| Abstract: |
| In this study, triaxial shear tests were carried out for the deformation and failure behaviors of unconsolidated sediments bearing with methane hydrate at different saturations. The principle of critical state theory was applied to explore the mechanisms of strain softening and hardening failures. The effects of confining pressure and hydrate saturation on the strength of the hydrate bearing sediment and their sensitivity on the failure mode were investigated. The results show that the failure mode of the sediment is mainly dependent on the effective confining pressure and hydrate saturation, while the effect of the failure mode on the peak strength, initial yielding strength, initial yielding modulus, cohesive force and internal friction angle is not important. However, the tangent modulus and peak shear modulus can be significantly affected by the failure mode. Therefore, the strength parameters of methane hydrate-bearing unconsolidated sediment should be modeled and calculated under the same failure mode. |
| Key words: unconsolidated hydrate-bearing sediment methane hydrate triaxial shear test strain-softening strain-hardening |
