碎石保护结构防拖锚效果的DEM分析

发布时间：2018-03-25 18:48

本文选题：碎石保护结构　切入点：离散元　出处：《天津大学学报(自然科学与工程技术版)》2017年04期

【摘要】：在近海港口停泊地区,海底管线通常埋置在碎石保护结构中,以免遭受来自拖锚或抛锚的撞击而损伤.为评价走锚时碎石保护结构对海底管线的防护效果,基于碎石结构的离散特点,采用离散单元法(DEM)模拟了拖锚从细砂到碎石保护结构的运动过程,并与室内模型试验结果对比,验证了该方法的可行性.在此基础上,利用离散单元法研究了碎石保护结构的抗锚害机理,分析了不同碎石粒径、不同拖锚速度及不同初始拖锚位置时锚拖曳力、锚爪转角及锚爪爪尖轨迹等的变化规律.分析结果表明,碎石粒径和拖锚速度越大,锚爪爪尖在碎石层中抬升的高度越高,越有利于保护海底管线;从不同初始位置开始的拖锚运动,达到稳定运动状态时的拖曳力、锚爪爪尖轨迹及锚爪转角基本相同.该结果可以为海底管线碎石保护结构的设计提供依据.
[Abstract]:In offshore port berthing areas, submarine pipelines are usually buried in gravel protective structures to avoid being damaged by impact from towing anchors or dropping anchors. Based on the discrete characteristics of crushed stone structure, the discrete element method (DEM) is used to simulate the motion process of towed anchor from fine sand to gravel protection structure, and the results of indoor model test verify the feasibility of the method. In this paper, the anti-anchor mechanism of crushed stone protective structure is studied by discrete element method, and the anchor-towing force with different gravel particle size, different anchoring speed and different initial anchoring position is analyzed. The analysis results show that the higher the diameter of gravel and the velocity of anchor, the higher the height of lifting of anchor claw tip in the gravel layer, the better the protection of submarine pipeline. The drag force, the trajectory of the tip of the anchor claw and the angle of rotation of the anchor claw are basically the same when the motion of the towed anchor starts from different initial positions, which can provide the basis for the design of the protective structure of submarine pipeline gravel.
【作者单位】：天津大学建筑工程学院;
【基金】：国家优秀青年科学基金资助项目(51322904)~~
【分类号】：U653.2;P756.2

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