波浪导致的海床边坡稳定性分析

利用Biot二维固结理论，计算出波浪引起的海床应力场；在假设海床土体的粘聚力不受波浪作用影响的条件下，推导出了波浪导致弱粘性土或粉土海床失稳的破坏准则，丰富了波浪导致海床失稳的判别方法。并把这一破坏准则用于黄河三角洲埕岛油田海域的海床底坡稳定性分析，讨论了50年一遇和5年一遇两种海况条件下，土体粘聚力对该地区波浪导致海床破坏深度的影响，计算结果表明，土体粘聚力对海床稳定性影响明显。

Analysis of seabed stability under wave loading

The stress field induced by waves in seabed is calculated on the basis of Biot’s two-dimensional consolidation theory. On the assumption that cohesive force of seabed soil isn’t associated with wave action, a criterion is proposed for discriminating wave-induced failure in seabed of feebly cohesive soil or silt; and it enriches traditional discriminant methods. Moreover, with a detailed discussion about influence of cohesive force on failure depth of seabed, the criterion is applied with ideal results to analyze the stability of seabed in the sea area of Chengdao Oilfield, the yellow River Delta. In the analysis, influence of cohesive force of soil on failure depth of seabed induced by waves is discussed under two oceanic conditions (with occurrence periods of 50 and 5 years). Calculation results show that the cohesive force of soil has a prominent influence on seabed stability.