| 基于扰动状态概念的含水合物土弹塑性模型 |
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| 引用本文： | 邹远晶,韦昌富,陈合龙,周家作,万义钊.基于扰动状态概念的含水合物土弹塑性模型[J].岩土力学,2019,40(7):2653-2662. |
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| 作者姓名： | 邹远晶 韦昌富 陈合龙 周家作 万义钊 |
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| 作者单位： | 1. 中国科学院武汉岩土力学研究所 岩土工程国家重点实验室，湖北 武汉 430071；2. 中国科学院大学，北京 100049；
3. 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 |
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| 基金项目： | 国家自然科学基金项目(No. 41572293，No. 11502276，No. 41602312)。 |
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| 摘 要： | 含水合物土是由水合物赋存在土体中形成的特殊土,其力学特性不仅与饱和度有关,和赋存模式也有很大的关系。不同赋存模式的水合物胶结结构不同,其力学特点也不尽相同。考虑含水合物土在荷载作用下胶结结构会发生破坏,采用扰动状态概念,建立含水合物土的应力-应变模型来描述胶结结构受载破坏的全过程。同时,采用水合物的有效饱和度表示的伤变量来描述含水合物土的内部结构的在受载条件下的发展规律。根据含水合物土的力学行为,采用理想弹塑性模型和摩尔-库仑模型来描述两个参考状态,形式相对简单,参数易于确定。最后通过三轴剪切试验对模型进行了检验,结果表明该模型能较为合理的模拟含水合物土在扰动过程中的变形特点。
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| 关 键 词： | 含水合物土 胶结结构 扰动状态概念 有效饱和度 |
| 收稿时间： | 2018-03-26 |
Elastic-plastic model for gas-hydrate-bearing soils using disturbed state concept |
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| ZOU Yuan-jing,WEI Chang-fu,CHENG He-long,ZHOU Jia-zuo,WAN Yi-zhao.Elastic-plastic model for gas-hydrate-bearing soils using disturbed state concept[J].Rock and Soil Mechanics,2019,40(7):2653-2662. |
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| Authors: | ZOU Yuan-jing WEI Chang-fu CHENG He-long ZHOU Jia-zuo WAN Yi-zhao |
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| Institution: | 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. Key Laboratory of Natural Gas Hydrate, Ministry of Land and Resources, Qingdao Institute of Marine Geology, Qingdao, Shandong 266071, China |
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| Abstract: | Gas-hydrate-bearing soil is a special soil with hydrates filling in the pores of the soil. Its mechanical properties are not only related to hydrate saturation but also to the occurrence habits of hydrate. The mechanical characteristics of hydrate hosting structures with different habits are different. Considering the failure of structure in gas-hydrate soil under loading, the stress and strain model of hydrate bearing soil is established based on the disturbed state concept to describe the whole process of loading failure of cemented structures. At the same time, the disturbed function expressed by the effective saturation of hydrates is used to describe the development of the internal structure of the hydrated soil under the loading condition. According to the mechanical behavior of hydrate bearing soil, two reference states are described by the ideal elastoplastic model and the Mohr-Coulomb model. The form of this model is relatively simple, and the parameters are easy to be determined. Finally, the three triaxial compression tests are used to verify the model. The results show that the model can reasonably simulate the deformation characteristics of hydrate bearing soil in the process of disturbance. |
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| Keywords: | gas-hydrate-bearing soil cemented structures disturbed state concept effective saturation |
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