Development of a simulation method for the ground deformation during the dissociation and formation of gas hydrate

为了研究南海海槽深海海底沉积物的分解行为，采用减压法对含CO2水合物的砂进行了分解试验。此外，我们还发展了一种化学-热-力耦合分析的数值方法，并模拟了解离实验。从目前的研究中，我们已经证实，所提出的数值方法很好地再现了温度的变化，并解决在解离试验。

We have conducted dissociation tests by depressurizing method for sand containing CO2 hydrates, in order to investigate the dissociation behavior of sediments in deep sea bottom at Nankai Trough. Also, we have developed a numerical method of chemo-thermo-mechanically coupled analysis, and simulated the dissociation tests. From the present study, we have confirmed that the proposed numerical method well reproduce the change in temperature, and settlement during the dissociation tests.