抛锚对海底管道影响的离心模型试验研究  

Centrifugal model tests on influences of anchor dropping on offshore pipelines

作　　者：刘海成 安晓宇 王斐[1] 张宇亭[1] 李建东[1] 边天奇 元光宗 LIU Haicheng;AN Xiaoyu;WANG Fei;ZHANG Yuting;LI Jiandong;BIAN Tianqi;YUAN Guangzong(National Engineering Research Center of Port Hydraulic Construction Technology,Tianjin Research Institute for Water Transport Engineering,M.O.T.,Tianjin 300456,China;State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China)

机构地区：[1]交通运输部天津水运工程科学研究院港口水工建筑技术国家工程研究中心,天津300456 [2]天津大学水利工程仿真和安全国家重点实验室,天津300072

出　　处：《岩土工程学报》2024年第S01期217-221,共5页Chinese Journal of Geotechnical Engineering

基　　金：中央级公益性科研院所基本科研业务费专项资金项目(TKS20230107)。

摘　　要：锚击是影响海底管道安全运营的重要因素之一。采用天科院TK-C500土工离心机以及新开发的抛锚试验装置开展了抛锚离心模型试验,测量了海底管道的受力变化,分析了抛锚作业对浅埋海底管道的影响。试验结果表明,落距对管道弯矩的变化有着普遍性的影响,管道弯矩增量与落点的水平距离和管道埋深呈现明显的非线性特征。当12.3 t霍尔锚落在φ630管道正上方时,各种不同落距各种不同管道埋深工况,管道弯矩增量都远大于其塑性屈服弯矩,管道的安全运行已经受到了严重威胁。当落距小于3.5 m、水平距离大于1.4 m时和当落距增大到7 m、水平距离大于2.8 m时,管道弯矩增量不会超过塑性屈服弯矩;随着落距继续增大,锚落于管道一定范围内时,都将对管道安全运行产生严重威胁。Anchoring is one of the important factors affecting the safe operation of submarine pipelines.The centrifugal model tests are carried out by using the TK-C500 geotechnical centrifuge and the newly developed anchor dropping test devices.The force changes of the submarine pipelines are measured,and the influences of the anchor dropping operation on the shallowly buried submarine pipelines are analyzed.The test results show that the dropping distance has a universal influence on the change of the bending moment of the pipelines,and the increment of the bending moment of the pipelines has obvious nonlinear characteristics with the horizontal distance of the dropping point and the buried depth of the pipelines.When the Hall anchor of 12.3 t falls directly above the pipelines with φ630,the bending moment increment of the pipelines is much larger than its plastic yield bending moment regardless of the different dropping distance or the buried depth of the pipelines,and the safe operation of the pipelines is seriously threatened.When the dropping distance is less than 3.5 m and the horizontal distance is greater than 1.4 m,and the dropping distance increases to 7 m and the horizontal distance is greater than 2.8 m,the increment of bending moment of the pipelines will not exceed the plastic yield bending moment.As the dropping distance continues to increase,when the anchor falls within a certain range of the pipelines,it will pose a serious threat to the safe operation of the pipelines.

关 键 词：土工离心模型试验 霍尔锚 抛锚 海底管道 

分 类 号：TU411[建筑科学—岩土工程]