Centrifuge experimental study on instability of seabed stratum caused by gas hydrate dissociation

Centrifuge experimental study on instability of seabed stratum caused by gas hydrate dissociation
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天然气水合物解离引起海底地层失稳的离心机实验研究

DOI:
10.1016/j.oceaneng.2015.06.006
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发表时间:
2015-09
期刊:
影响因子:
5
通讯作者:
Shi YH
Shi YH
中科院分区:
工程技术2区
文献类型:
--
作者:
Zhang XH;Lu XB;Shi YH

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天然气水合物(GH)是一种储量巨大的固体能源。地层不稳定(例如海洋滑坡)可能是由于地层软化和超孔隙压力积聚导致水合物分解造成的。本文通过离心实验来研究水合物解离过程中地层不稳定性的演变。水合物解离区从含水合物沉积物(HBS)中的热源开始扩展。伴随缓慢渗流和土层软化变形,孔隙流体压力显着增大。可以观察到较大的水平位移和垂直位移,并且随着水合物解离带的扩大而增加。研究结果可用于数值模拟验证和工程设计参考。
Gas hydrate (GH) is a kind of solid energy resource with huge reserve. Stratum instability (such as marine landslide) may be caused by hydrate dissociation due to the softening of stratum and the build-up of excess pore pressure. In this paper, a centrifuge experiment was conducted to study the evolution of stratum instability during hydrate dissociation. The hydrate dissociation zone expands from the heating source in hydrate bearing sediment (HBS). The pore fluid pressure increases significantly accompanying the slow seepage and soil layer׳s softening and deformation. Large horizontal displacements and vertical displacements can be observed and increase with the expansion of hydrate dissociation zone. The results can be used for the verification of numerical simulations and a reference for engineering design.
DOI: 10.1201/9781482269321
发表时间: 2018-10
期刊: --
影响因子: --
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