圆筒式沉箱设施作为水下生产系统的新型防护结构，其在落锚撞击作用下的损伤问题，是工程领域和学术领域长期关注的焦点与难点。本文通过模型实验方法，对特殊的非对称开孔沉箱式防护设施撞击损伤特性进行研究，选用渤海通航区某水下生产系统沉箱式防护设施和该设施所在海域落锚作为原型，通过量纲分析，以撞击速度为主要相似性参数，确定了1：11的模型实验相似比，对沉箱式结构和落锚进行缩比尺模型实验。重点关注落锚速度、落锚质量和撞击位置对非对称开孔沉箱式防护结构的损伤影响规律。研究结果表明：开孔附近区域，撞击能量主要以挠曲变形形式耗散，也通过振动形式耗散，撞击产生的损伤以挠曲变形为主，损伤程度较为严重；距开孔区域较远位置，撞击能量主要以振动形式耗散，撞击产生损伤以凹陷变形为主，损伤程度较小。
Abstract
Caisson protection facilities is a new type of protective structure for underwater production system. Its damage under the impact of anchor dropping is the center of attention in engineering and academic fields. This paper analyzed the impact damage characteristics of the special unsymmetrical perforated caisson type protection facilities through model tests. The test prototypes are the caisson type protection facilities of an underwater production system in the navigation area of Bohai Sea and the anchor drop in the sea area of the facilities. By dimensional analysis, taking the impact speed as the main similarity parameter, the model test similarity ratio of 1:11 is determined, and the caisson type structure and anchor drop are simulated by scaled experiments. This paper focuses on the structural damage characteristics of the caisson type protective structure with asymmetric openings under different anchor dropping speeds, different anchor dropping masses and different impact positions. The results show that in the area near the opening hole, the impact energy is partially dissipated in the form of flexural deformation and partially dissipated in the form of vibration. The damage caused by impact is mainly flexural deformation, and the impact damage is large; Far away from the hole area, the impact energy is mainly dissipated in the form of vibration. The damage caused by impact is mainly concave deformation, and the impact damage is small.
关键词
沉箱防护设施 /
撞击损伤 /
非对称开孔 /
模型实验
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Key words
Model test /
Asymmetric openings /
Impact damage /
Caisson protection facilities;
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