Physical and numerical model study on stability of concrete interlocking mattress for submarine cable protection

WANG Xiao-jian; HUANG Pan-yang; XU Jian-ping; LAI Xiang-hua; LI Han-ping; HU Lie-xiang

doi:10.3969/j.issn.1001-909X.2019.03.009

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Journal of Marine Sciences ›› 2019, Vol. 37 ›› Issue (3) : 73-78. DOI: 10.3969/j.issn.1001-909X.2019.03.009

Physical and numerical model study on stability of concrete interlocking mattress for submarine cable protection

WANG Xiao-jian¹, HUANG Pan-yang^*2, XU Jian-ping², LAI Xiang-hua², LI Han-ping³, HU Lie-xiang¹

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Abstract

When the submarine cable passes through the hard bottom seabed, covering the concrete interlocking mattress can effectively protect it. According to the measured hydrological data in the sea area of the state grid corporation of 500 kV submarine cable project, two methods were used to study the stability of the concrete interlocking mattress under the extreme flow. Based on function analysis of the mechanical balance, it is found that when the bottom length of the concrete block is fixed, there is an extreme height. At this time the concrete block laid on seabed is the most stable, and also the flow velocity that can be resisted is the largest. Through numerical simulation, the three-dimensional flow characteristics of concrete interlocking mattress in current were studied. After comparing the force situation of different shape concrete blocks, it is found that when the edge of the concrete block is rounded, the flow structure around the edge can be changed, and the stability of the concrete block can be strengthened in general. Although the current velocity in the sea area of the state grid corporation of 500 kV submarine cable project is large, the conventional size of 0.4 m×0.4 m×0.3 m blocks can resist the impact of the current and protect the submarine cable.

Key words

concrete interlocking mattress / submarine high voltage cable / protection / stability

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WANG Xiao-jian, HUANG Pan-yang, XU Jian-ping, LAI Xiang-hua, LI Han-ping, HU Lie-xiang. Physical and numerical model study on stability of concrete interlocking mattress for submarine cable protection[J]. Journal of Marine Sciences. 2019, 37(3): 73-78 https://doi.org/10.3969/j.issn.1001-909X.2019.03.009

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