极端波浪条件下深水导管架基础结构波浪总力试验研究

Experimental Study on Wave Total Force Subjected by Deepwater Jacket Foundation Structure Under the Extreme Wave Condition

波浪力对海上风电深水导管架基础结构的稳定性和安全性至关重要。通过波浪物理模型试验对极端波浪条件下深水导管架基础结构的波浪总力进行了试验研究,试验水深包括50m和70m两种,在1000a一遇波浪条件下,分别分析了深水导管架结构所受的波浪总水平力和垂直力。研究结果表明:相同重现期极端波浪作用下,70m水深情况下的导管架结构波浪总水平力小于50m水深的结果,但是70m水深的导管架结构波浪总水平力弯矩大于50m水深的结果;相同水深、水位和波浪条件下,导管架结构受到的波浪总垂直力明显小于波浪总水平力;在相同重现期极端波浪作用下,低水位情况时70m水深的导管架结构波浪总垂直力与50m水深的结果差别不大,但是在高水位时,由于在70m水深的极端波浪条件下波峰可冲击作用到上部平台底面,70m水深的导管架结构波浪总垂直力明显大于50m水深的结果。

Wave force is crucial to the stability and safety of deep-water jacket foundation structure of the offshore wind power.By wave physical model tests,the wave total force subjected by the deep-water jacket foundation structure under the extreme wave condition is experimentally studied,including the total horizontal force and vertical force.The water depth for the experiment is 50m and 70m respectively and the wave return period is once in 1000 years.The results show that under the action of the extreme waves with the same return period,the wave total horizontal force subjected by the jacket structure at a water depth of 70m is less than that at a water depth of 50m,but the bending moment of the total horizontal force at the water depth of 70m is greater than that at the water depth of 50m.Under the case of the same water depth,water level and wave conditions,the wave total vertical force subjected by the jacket structure is significantly less than the wave total horizontal force.Under the action of the extreme waves with the same return period,the wave total vertical force subjected by the jacket structure at the water depth of 70m has no big difference from that at the water depth of 50m at low water level.At high water level,however,the wave total vertical force at the water depth of 70m is significantly greater than that at the water depth of 50m because at the water depth of 70m the wave crests can impact to and act on the bottom surface of the upper platform under the extreme wave condition.