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海床中的天然气水合物分解后由固体变为气体,将直接提高孔隙水压力,减小边坡内有效应力,导致边坡稳定性下降。本文以能量上限定理为理论基础,采用二维极限分析方法分析海底缓倾角边坡的滑坡机理,研究由于水合物分解形成的软弱夹层对边坡稳定性的影响。分析表明,软弱夹层的埋深和海床土体内摩擦角会对边坡的稳定性产生直接影响。由于水合物分解而产生的膨胀压力也会降低海底缓倾角边坡的稳定性。
The gas hydrate in the seabed decomposes from solid to gas, which will directly increase the pore water pressure and reduce the effective stress in the slope, resulting in the decline of slope stability. Based on the theorem of upper bound of energy, this paper analyzes the landslide mechanism of the gentle dip slope at the seafloor using two-dimensional limit analysis method and studies the influence of soft interlayer formed by hydrate decomposition on slope stability. The analysis shows that the depth of the weak interlayer and the friction angle of the seabed soil will have a direct impact on the stability of the slope. Expansion pressures due to hydrate decomposition also reduce the stability of the gentle dip slope.