海底管线自沉过程研究  

Study on submarine pipeline sinking

作　　者：唐丕鑫 杨树耕[1] 宋艾恒 王晗[1] 刘晓峰[1] 徐蒙[1] 

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072 [2]上海外高桥造船海洋工程有限公司,上海200306

出　　处：《天津理工大学学报》2014年第6期1-6,共6页Journal of Tianjin University of Technology

基　　金：国家重点基础研究发展计划(973计划)(2014CB046802)

摘　　要：海底管线的稳定性是海底管线研究的重要内容之一.通过有限元软件ABAQUS,应用Mohr-Coulomb塑性模型,模拟海底管线自沉过程.通过进行海床土体初始地应力平衡、设置管土接触的方法,建立海底管土相互作用模型,分别计算了管线在自重和波流载荷联合作用下的管线变形及土体沉降量.计算结果显示,管线自重和波流载荷对管线的弯曲变形影响较大,对土体沉降量影响较小.同时通过对比模拟研究,发现管线水下重量、外径,土体粘聚力、内摩擦角都对土体沉降量有不同程度的影响,影响的大小程度取决于土体是否进入塑性屈服状态,参数的改变使土体越容易发生塑性屈服,土体的沉降量越大.The stability of submarine pipeline is one of the important content in the research of the submarine pipeline. Through finite element software ABAQUS, the Mohr-Coulomb plastic model was established to simulate the pipeline sinking process. Through balancing the soil in-situ stress, setting the pipe-soil contact model, to build a submarine pipe-soil interaction model to calculate the deformation and force condition of embedded pipeline under the load of gravity and the combined load of weight and harmonic wave and current force respectively. The calculation results show, pipeline deadweight and wave and current force have great impact on the bending deformation of pipe and the soil settlement. At the same time, by compar- ing the simulation research, we found that underwater pipeline weight, diameter, soil cohesion, internal friction angle have different effects on the soil settlement, the size of the effect depends on the degree of soil into the plastic state, parameter changes to make the soil more prone to plastic yield, the soil settlement is more bigger.

关 键 词：海底管线 ABAQUS 有限元法 管土作用 沉降量 

分 类 号：TE88[石油与天然气工程—油气储运工程]