王腾,王晓彤,胡新辉.深水半潜式平台张拉锚泊系统失效分析[J].海洋工程,2018,36(5):128~133
深水半潜式平台张拉锚泊系统失效分析
Failure analysis of taut mooring systems for semi-submersible platform in deep water
  
DOI:10.16483/j.issn.1005-9865.2018.05.016
中文关键词:  半潜式平台  张拉锚泊系统  走锚  断锚  AQWA
英文关键词:semi-submersible platform  taut mooring systems  dragging anchor  broken line  AQWA
基金项目:
作者单位E-mail
王腾 中国石油大学(华东) 船舶与海洋工程系 山东 青岛 266580 wteng1973@126.com 
王晓彤 中国石油大学(华东) 船舶与海洋工程系 山东 青岛 266580  
胡新辉 中国石油大学(华东) 船舶与海洋工程系 山东 青岛 266580  
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中文摘要:
      针对深水半潜式平台在极端工况下张拉锚泊系统失效情况,基于板锚失效上拔过程中位移与承载力的关系曲线,提出在AQWA软件中用非线性锚缆模拟板锚走锚过程的方法,对深水半潜式平台张拉锚泊系统在百年一遇工况下断锚、走锚情况的平台响应、锚缆拉锚力及最大缆张力进行分析。研究表明:断锚时各锚链拉力瞬变,平台迅速发生大距离偏移;走锚时随着板锚的拔出各锚链上的拉力逐渐增大,平台位置逐渐偏移,最后达到平衡状态。单缆断锚时,迎浪向5号锚缆拉力最大;单缆断锚且单锚走锚时,3、6号锚缆拉锚力最大。失效缆超过一根时,平台偏移和单缆最大缆张力均超出规范要求,同时其它锚缆最大拉锚力极有可能出现超过板锚极限承载力的情况,最终造成整个锚泊系统破坏。
英文摘要:
      For the taut mooring systems of a semi-submersible platform in deep water, mooring lines or plate anchor may fail under extreme environmental conditions. Based on the relationship between uplift force and displacement during plate anchor′s pulling out, a non-linear polynomial mooring line model in AQWA is developed to simulate the plate anchor′s pulling out process in a specifically severe condition. The offsets of the platform and the tension of mooring lines are investigated for anchor dragging and mooring line broken cases under 100-year return period extreme environmental condition. The results show that the tension forces of the mooring lines and platform offsets change immediately when mooring line breaks; and when the plate anchor fails, those gradually change until they reach a new balance. When one line breaks, the tension of No. 5 line is the largest. When one line breaks as well as one anchor drags, the tensions of No. 5 and 3 lines are the largest. When two lines fail, the offset of platform and the tension of line may be beyond the ultimate bearing capacity of the plate anchor or the cable broken capacity, which will cause the whole taut mooring system failure.
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