摘要
海底管线抛石保护层的抗锚害能力涉及离散和连续两种不同尺度介质的相互作用。针对单独使用连续体法或离散元法分析的不足,以室内落锚实验为背景,采用有限差分法(FDM)模拟船锚和管线,采用离散单元法(Discrete Element Method,DEM)模拟抛石保护层,建立三者相互作用的耦合分析模型,并对该模型的船锚侵入位移和管线的侧壁承压进行了计算,证明该耦合方法合理可行。以500kV海南联网工程后续抛石保护工程为工程实例,通过DEM-FDM耦合计算定量得到了抛石保护层的抗锚害能力。结果表明,抛石保护层对管线抵抗船锚冲击有较好的保护作用,并且该作用是通过堆石体内部力链的形成、重组和稳定过程实现的。
The capacity of submarine pipeline protection by riprap against anchor involves the interaction of discrete and continuous media of different scales. For the shortcomings of analysis only using continuum method or discrete element method,the anchor and pipeline were simulated by finite difference method( FDM) while riprap protection layer by discrete element method( DEM),and a coupling analysis model for the interaction of the three parties was established to simulate indoor anchorage experiment. The intrusion displacement of the anchor and the lateral wall pressure of the cable were analyzed and calculated,which proves that the coupling method is reasonable and feasible. It took follow-up engineering of riprap protection for 500 kV Hainan network project as a engineering example,the capacity of submarine cable protection by riprap protection layer against anchor have been obtained quantificationally,the calculation results show that the riprap protection layer has a good protective effect on the resistance of submarine cable to the impact of anchor,which is achieved through the formation,reorganization and stabilization process of the force chain in the rockfill.
作者
程志远
李黎
肖鹏
亓丽芳
CHENG Zhiyuan;LI Li;XIAO Peng;QI Lifang(School of Architecture and Materials Engineering,Hubei University of Education,Wuhan 430205,China;Hubei Key Laboratory of Control Structure,Huazhong University of Science&Technology,Wuhan 430074,China)
出处
《实验室研究与探索》
CAS
北大核心
2020年第8期13-17,共5页
Research and Exploration In Laboratory
基金
国家自然科学基金资助项目(51808201)
湖北第二师范学院科研启动经费资助项目(No.8)。
关键词
海底管线
抛石保护层
离散单元法
有限差分法
力链
submarine pipeline
riprap protection layer
discrete element method
finite difference method
force chain
