水合物分解气体泄漏引起的海床破坏实验研究

EXPERIMENTAL STUDY OF THE SEA FLOOR DAMAGE DUE TO GAS ESCAPE IN HYDRATE DISSOCIATION

海床下水合物分解可能造成大量的生成气体泄漏.气体渗漏一方面造成海床表层的破坏;另一方面使得海水密度减小造成海上一些结构的安全隐患.本文通过实验研究泄漏气体在水中上升过程中的扩散行为,以及渗漏对海底粉砂土海床的破坏规律.考虑压力,盖层厚度在渗漏气体对盖层土体形态破坏的影响,获得了气体在水中上升过程中的扩散角的特点,以及气体泄漏导致的海床冲刷坑范围随气体压力、土层厚度的变化规律,可以为进一步的研究和工程应用提供参考.

The dissociation of gas hydrate in seabed produces a lot of gas. If the seabed is permeable, the gas will escape, which will lead to the damage of the seabed, and to the decrease of the density of sea water and to threaten the safety of the structures above. In this paper, the movement and the expansion behavior of gas in the water are studied, then the damage of the seabed due to the gas escape is analyzed. The effects of gas pressure and thickness of soil layer are investigated. The expansion angle of gas in the water is obtained. The characteristics of the hole size induced by the gas escape under various gas pressure and soil thickness are also obtained. These results can be used in further research and practice.