【摘要】 通过野外勘察和室内试验分析结果,了解琼州海峡北海—临高段海缆路由区浅层海底土分布特征和路由区及其附近海区的潮流特征,利用计算的方法分析了10 a和50 a一遇的潮流对海缆路由区冲刷破坏的可能性。结果发现,在琼州海峡海缆路由区海底砂性土平均起动流速(23.2~58.9 cm/s)小于10 a一遇(75.2~93.8 cm/s)和50 a一遇(85.4~113.7 cm/s)的预测流速;海底粘性土的平均起动流速(64.8 cm/s)也小于10 a一遇(76.2 cm/s)和50 a一遇(87.4 cm/s)的预测流速。路由区海底土会因潮流冲刷作用而发生失稳破坏,影响埋设在海底土中海缆的安全。同时,结果还发现潮流对砂性海底土的影响大于对粘性海底土的影响。更多还原

【Abstract】 The distributions of seabed soil and the tidal current characteristics in the Beihai-Lingao section submarine cable route area in the Qiongzhou Channel are acquired by analyzing the field survey and indoor test results,and the possibilities of soil mass failure in the cable route area due to 10 year and 50 year return period tidal currents are calculated and analyzed.It is shown from the calculated results that the average thre-shold velocity for sandy soil(23.2 to 58.9 cm/s) is lower than the predicted 10 year(75.2 to 93.8 cm/s) and 50 year(85.4 to 113.7 cm/s) return period current velocities,and the average threshold velocity for cohesive soil(64.8 cm/s) is also lower than the predicted 10 year(76.2 cm/s) and 50 year(87.4 cm/s) return period current velocities.Therefore,the seabed soil failure due to the tidal current scour in the cable route area may occur to affect the safety of submarine cable buried in the seabed soil.In addition,it is shown from the calculated results that the effect of tidal current on sandy seabed soil is larger than that on cohesive seabed soil.更多还原