碎石保护结构防护海底管线的机理及模型试验研究

发布时间：2018-04-13 21:28

本文选题：拖锚 + 碎石防护结构　；参考：《岩土工程学报》2014年11期

【摘要】：近海海底管线会在港口锚地处因船舶走锚而受到损害,碎石结构能够防护管线免受走锚的危害,因此研究碎石结构的防护机理对保护管线有重要意义。采用极限平衡方法分析了走锚状态下土楔对形状复杂的商用霍尔锚的作用力,提出了锚冠和锚爪的受力计算模式,采用3种不同几何相似比的模型锚在模型槽中进行了拖锚试验。模型试验的结果与计算结果相互吻合。锚体整体受力分析的结果表明,霍尔锚在从砂土进入碎石保护层后因力矩不平衡引起锚体翻转,使锚爪尖位置上移而远离埋设的管线,从而使管线避免走锚的伤害。该机理也通过模型试验得到验证。此外,不同试验锚重的归一化结果还说明,霍尔锚锚爪在碎石中的稳定入土深度约为爪长的0.45,拖曳力为2.5倍锚重,可为碎石结构设计参考。
[Abstract]:Offshore submarine pipeline will be damaged by ship anchor at port anchor location, and gravel structure can protect pipeline from the harm of anchor, so it is important to study the protective mechanism of gravel structure to protect pipeline.The ultimate equilibrium method is used to analyze the force of the earth wedge on the commercial Hall anchor with complex shape under the condition of walking anchor, and the stress calculation model of the anchor crown and the anchor claw is put forward.Three kinds of model anchors with different geometric similarity ratios were used to test the drag anchors in the model slot.The results of the model test are in good agreement with the calculated results.The results of the whole stress analysis of the anchor body show that after entering the gravel cover from sand to sand, Hall anchor overturns the anchor body because of the unbalance of moment, which causes the tip of the anchor claw to move up and away from the buried pipeline, thus avoiding the damage caused by the walking anchor.The mechanism is also verified by model tests.In addition, the normalized results of different test anchor weights show that the stable depth of Hall anchor claw in gravel is about 0.45 of the length of claw, and the drag force is 2.5 times of anchor weight, which can be used as a reference for the design of crushed stone structure.
【作者单位】：天津大学建工学院;海洋工程股份有限公司;
【基金】：国家自然科学基金项目(51322904)
【分类号】：TU476;P756.2

【共引文献】