地震作用下海缆路由的稳定性分析

通过野外勘察和室内试验分析,了解琼州海峡北海-临高段海缆路由区浅层沉积物分布和物理力学特征.同时,对调查区及其附近地区的地震资料进行分析.将地震作用与路由区海底土的特性结合起来,计算分析了地震作用下路由区3 m以浅海底土液化或滑移的可能性,从而,评价了路由区海底的稳定性.结果发现,在烈度为Ⅶ度的地震作用下,路由区海底稳定性良好;在烈度为Ⅷ度的地震作用下,路由区海底会发生失稳破坏.该结论可以用于指导海缆工程建设.

Stability Analysis of Submarine Cable Route Under Earthquake Actions

Based on the near-surface sediment distributions and physicomechanical characteristics in the Qiongzhou Strait Beihai to Lingao submarine cable route area and the earthquake data observed in the cable route neighbouring area, the possibilities of liquefaction or slide of seabed soil at depths less than 3 m in the route area under the earthquake actions are computed and analyzed. It is shown from the computed results that the seabed stability in the route area under the magnitude 7 earthquake actions will be good, and the seabed instability failure in the route area under the magnitude 8 earthquake actions will take place. This conclusion can be used for guiding the submarine cable engineering construction.