中文摘要：

波浪引起的海床不稳定性是海洋工程中需要考虑的重要问题。在对现有波致海床滑动稳定性计算方法进行分析的基础上,提出了一种波致海床滑动稳定性计算的全应力状态法,将其与现有计算方法进行了对比分析,并进一步研究了波致砂土海床和软土海床的滑动失稳特征。结果分析表明,全应力状态法在波致海床滑动稳定性分析中具有较好的适用性。对于砂土海床,其滑动稳定性受饱和度的影响较大,且当海床计算厚度约为0.2倍波长时对应的滑动深度最大。波浪作用下坡度不超过2°的均质软土海床,其最危险滑动面的位置仅与波长有关,其滑动深度约为0.21倍波长,滑动面半弦长约为0.33倍波长;海床表面的波压力数值只影响其安全系数的大小,而不影响其滑动深度。

英文摘要：

Wave-induced seabed instability is an important problem considered by ocean engineers. On basis of ana- lyzing the present calculation methods for wave-induced seabed sliding instability, a new method , referred to the overall stress state method, is established to calculate the seabed sliding stability under wave loading. The new method has been compared with others, and the wave-induced sliding failure characteristics of sandy seabed and the soft clay one has been analyzed. The results have shown that the overall stress state method is applicable to com- pute the seabed sliding instability. For sandy seabed, saturation has great influence on its sliding instability, and the sliding depth will reach the maximum when the seabed thickness is 0.2 times of the wave length. For homoge- neous soft clay seabed with slope angle no larger than 2°under wave loading, location of the most dangerous sliding surface is only related with the wave length, that is, the sliding depth is 0.21 times of the wave length and the half chord length of sliding arc is 0.33 times of the wave length. The wave pressure has influences only on factor of safety of the most dangerous sliding surface of the soft clay seabed, not on the sliding depth.