摘要
由于海床的不稳定性,海底管道易出现不同程度的悬空现象,国内外的治理措施大多采用整体抛石法,治理费用高昂。在参考国内外石堆设计经验和抛石工程案例的基础上,结合抛石方法本身的独特性,提出了采用局部抛石治理海底管道悬空的方法:选取管道悬空中间某位置进行抛石,通过石堆对管道形成单点支撑,缩短悬空距离,从而达到治理管道悬空的目的。以某在役海底管道为研究对象,依据弗劳德数相等原理,采用缩尺方法设计室内试验方案,得出了流体对石堆的破坏机理、各石堆的薄弱位置以及石堆极限抗流速度,分析了管道与海流夹度、悬空高度、外层石子粒径、内层石子粒径、迎流面坡比及侧流面坡比对石堆稳定性影响的规律,为局部抛石治理海底管道悬空提供了试验依据。
Unsupported phenomena occurs on submarine pipelines at different degrees due to the instability of seabed. In order to solve this problem, an integral rock dumpling method is mostly used all over the world, but its expense is quite high. In reference to domestic and foreign rock stack design experience and rock dumping engineering cases, a local rock dumping concept was newly proposed to solve the problem of submarine pipeline spans by combining with the uniqueness of rock dumping methods. Based on this new concept, it is usually to dump rocks in the middle of unsupported parts of submarine pipelines, and a single-point support is formed between the pipeline and the rock stack. In this way, the span is shortened, so the unsupported phenomena of pipelines are handled. In this paper, a case study was conducted on an in- service submarine pipeline. Based on Froude number equality principle, the break mechanism of fluids on rock stacks, the weak positions of each rock stack and ultimate anti-flow velocity of rock stacks were obtained by means of indoor tests which were designed by a scale method. And analysis was performed on the included angle between pipelines and currents, the span height, the particle sizes of external and internal rocks, and the influencing laws of the stoss side slope ratio and side-flow slope ratio on rock stack stability. It provides experimental basis for solving the unsupported issues of submarine pipelines using the local rock dumping method. （2 Figures, 8 Tables, 10 References）
出处
《油气储运》
CAS
北大核心
2016年第7期784-787,共4页
Oil & Gas Storage and Transportation
关键词
海底管道
悬空
局部抛石
抛石试验
弗劳德数
submarine pipeline, unsupported, local rock dumping, rock dumping test, Froude number
作者简介
王怡，女，工程师，1982年生，2004年毕业于西南石油大学油气储运工程专业，现主要从事海底管道工程建设、维修检测及项目管理工作。地址：广东省深圳市南山区蛇口工业二路海洋石油大厦B座12楼，518067。电话：075526022575，Emaihwangyi7@cnooc．com．cn
