海底电缆抛石保护层抗锚害能力的数值仿真研究  

Numerical Simulation Study on the Degree of Submarine Cable Protection by Rockfill Against Anchor

作　　者：李黎[1,2] 程志远[1,2] 王腾飞[1,2] 胡海[1,2] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074 [2]华中科技大学控制结构湖北省重点实验室,湖北武汉430074

出　　处：《土木工程与管理学报》2013年第2期1-5,共5页Journal of Civil Engineering and Management

基　　金：国家电网公司科技项目(SGKJ[2007]413);国家自然科学基金(50878093)

摘　　要：对锚泊系统进行了静力平衡分析,编制了相应的迭代求解程序,得出了不同锚绳长时船锚受力的变化规律。基于离散元理论,以PFC3D为仿真平台,建立了堆石体-船锚-海缆的离散单元模型,对船锚作用附近堆石体采用多面体颗粒进行模拟,以真实地反应堆石的实际形态和实际强度,最后结合工程实例对船锚侵彻海缆抛石保护层的过程进行了数值仿真计算,得出了不同放锚阶段下堆石体和海缆的响应。计算结果表明:船锚所受竖向力仅在放锚初期存在,并且随着锚绳长度的增加迅速减小;堆石体对船锚的阻力在船锚侵入初期高幅震荡,增长迅速,后期增长缓慢,并最终趋于稳定,反应了堆石体力链的形成、发展、破裂和重组过程;抛石层对海缆有较明显的保护作用。With the static equilibrium analysis of the mooring system, and the corresponding iterative solver prepared, the changing law of the anchor force with different anchor rope length was obtained. Based on the discrete element theory, the rockfill-anchor-submarine cable discrete element model was built on the PFC3D simulation platform. The actual shape and strength of the rockfill interacted with anchor closely was appropriately achieved by simulation with polyhedral particles. Combined with the engineering practice, numerical simulation of the penetration process of anchor into the submarine cable riprap protection layer was conducted. Responses of the rockfill and submarine cable in different anchor putting stages were obtained. It is found that vertical force suffered by anchor exists only in the initial stage of anchor releasing, and decreases rapidly with the increase of the anchor rope length. Besides, the resistance of anchor by the rockfill increases rapidly with high amplitude vibration during the initial stage of penetration and tends to be stabilized eventually, which reflects the forming, developing, rupturing and restructuring process of the rockfill physical chain. Furthermore, the riprap layer has a significant protective effect on the submarine cable.

关 键 词：海底电缆 抛石保护层 离散单元法 数值仿真 力链 

分 类 号：TN818[电子电信—信息与通信工程]