| 摘要: |
| 通航区内水下油气生产系统需安装在海床下的钢圆筒防护装置内,以避免往来船舶抛锚、渔业活动等对油气开发设备造成破坏。为揭示海床下钢圆筒防护装置局部冲淤特性,同时验证工程设计方案可靠性,本文基于通航区海床下水下生产系统钢圆筒防护装置,对周围土体冲淤特性开展了试验研究。根据工程区域现场土样的级配资料配制了现场土样,并对不同回填土质的水动力特性进行敏感性分析,得到不同回填土质临界起动流速,为工程回填材料选择提供参考。同时针对平整海床、凸出式和齐平式防护装置类型,开展了模型试验研究。结果表明,基于工程场址土壤条件,在安装钢圆筒防护装置、设置回填材料各种情况下冲淤量很小,均不会发生明显的冲刷和淤积现象。现场实测验证了设计方案冲淤试验结果的可靠性,研究成果对海床下防护结构的设计提供参考。 |
| 关键词: 钢圆筒防护装置 模型试验 水流 海床冲淤 |
| DOI： |
| 分类号:TE54??? ????? |
| 基金项目:国家重点研发计划( 2021YFB2601100);中国海洋石油有限公司科研课题“海洋工程关键技术与装备研究”(KJGG-2022-1404) |
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| Experimental study on erosion and deposition of the seabed around the steel cylinder protective device under the seabed |
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liwei1, shenxiaopeng1, lishuzhao1, hezhenlin1, zhangjinfeng2
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1.CNOOC Research Institute Ltd;2.State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation
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| Abstract: |
| The underwater oil and gas production system in the navigation area needs to be installed in a steel cylinder protective device under the seabed to avoid damage to oil and gas development equipment caused by anchoring of passing ships and fishing activities. In order to reveal the local erosion and deposition characteristics of the steel cylinder protective device under the seabed in the navigation area and verify the reliability of the engineering design scheme, this article conducted experimental research on the erosion and deposition characteristics of the surrounding soil based on the steel cylinder protective device of the underwater production system under the seabed in the navigation area. According to the grading data of the soil samples on site in the engineering area, the soil samples were prepared, and a sensitivity analysis was conducted on the hydrodynamic characteristics of different backfill soil types to obtain the critical starting flow velocity of different backfill soil types, providing a reference for the selection of engineering backfill materials. At the same time, model tests were conducted for different types of protective devices such as flat seabed, protruding and flushing types. The results showed that based on the soil conditions of the engineering site, under various conditions of installing steel cylinder protective devices and setting backfill materials, the erosion and deposition volume was very small, and no significant scouring or deposition occurred. The field measurements verified the reliability of the erosion and deposition test results of the design scheme, and the research results provided a reference for the design of protective structures under the seabed. |
| Key words: Steel cylinder protective device Model testing Current Erosion and deposition of seabed |
