가스 하이드레이트의 해리로 인한 해저사면의 붕괴에 관한 연구 = A Study on Submarine Slope Failure due to Gas Hydrate Dissociation

다국어 초록 (Multilingual Abstract)

The influence of gas hydrate dissociation on submarine slope stability was studied in this paper. Gas hydrates are stable under high pressure and low temperature conditions. Once gas hydrate dissociates due to natural or human activities, it generates large amount of gas and water. During gas hydrate dissociation, a pore pressure between soil particles increases and results in the loss of an effective stress and degradation of soil stiffness and strength. An excess pore pressure generated by gas hydrate dissociation for the Storegga Slide was calculated from two existing pore pressure calculation methods and the proposed method. The proposed method gives at least two times more excess pore pressure than the existing methods. A slope stability analysis for the Storegga Slide using a two dimensional finite difference method was carried out by considering excess pore pressures due to gas hydrate dissociation. Since the excess pore pressure calculated by the proposed method resulted in the considerable loss of stiffness and strength in gas hydrate zone, a submarine slope failure occurred at the Storegga slide was successfully simulated.

참고문헌 (Reference)

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