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Evaluation of Mechanical behaviour for Resources Development of Methane Hydrate-Supported Sand in Deep Seabed

深海海底甲烷水合物支撑砂资源开发力学行为评价

基本信息

批准号：
17360226
负责人：
HYODO Masayuki
金额：
$ 9.47万
依托单位：
Yamaguchi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360226/
关键词：
Methane Hydrate Deep Seabed Sedimentary Deposits Resources Development Mechanical Behaviour Constitutive Model Ground Deformation Model Methane Gas 生産過程減圧法せん断変形体積変化構成モデル

项目摘要

The possible existence of a vast amount of methane hydrate around islands has attracted attention in Japan. At the same time, several production methods have then considered to extract the gas from the hydrate zone. Although it is known that the hydrates pose significant obstacles to drilling and production operations, them is at present only limited knowledge on the mechanical behavior of hydrate-rich zones, which is necessary to understand the stability around the site. For this purpose, a low-temperature high-pressure triaxial test equipment was developed to reproduce the temperature and pressure condition of the seabed where methane hydrate exists.The, methane hydrate was produced in the sand specimen set in the triaxial cell to measure its shear strength. Moreover, methane hydrate formation was replicated and methane hydrate was dissociated under different conditions of temperature and pressure in order to understand the resulting deformation behavior of the ground.On the basis of experimental results, an elastoplastic constitutive model for methane hydrate-bearing sand was developed based on subloading surface model. The bonding effect due to the cementation by methane hydrate was introduced into the model The bonding force was correlated with the pressure and temperature according to the experimental results. The simulation performed on the triaxial behaviour of methane hydrate-supported sand under various pressure and temperature condition showed good agreement with the experimental results.

岛屿周围可能存在大量的甲烷水合物，这引起了日本的关注。与此同时，几种生产方法也考虑从水合物带中提取天然气。虽然已知水合物对钻井和生产作业构成重大障碍，但目前对水合物富集区的机械行为的了解有限，而这对于了解现场周围的稳定性是必要的。为此，研制了一套低温高压三轴试验装置，以模拟甲烷水合物存在的海底环境的温度和压力条件，并在三轴室内制作了甲烷水合物砂样，测定了其抗剪强度。在此基础上，建立了基于次加载面模型的含甲烷水合物砂土弹塑性本构模型。模型中引入了甲烷水合物胶结作用的影响，并根据实验结果建立了胶结力与压力、温度的关联式。模拟结果表明，在不同压力和温度条件下，甲烷水合物支持的砂的三轴特性与实验结果吻合较好。