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When submarine cables are suspended in the air and dragged by ship anchors, they will be deformed or even fractured, which seriously threatens the power transmission and information communication. Therefore, it is of great application value to investigate the backfill protection scheme for the suspended section of submarine cables. Based on ABAQUS, we established a three-dimensional finite element model simulating the process of a ship anchor dragging a three-core composite submarine cable through soil. Using nonlinear dynamics, we obtained the stress changes in the cables armorlayer copper conductor, and fiber optic armoring when it was dragged through different soil materials by a ship anchor. We conducted comparative analysis of the protection effect of four kinds of soil properties on the marine cable. Then by applying different speed loads, we investigated the relationship between the longitudinal compression rate of the cable and the burial depth under different ratios, to propose a layered backfill protection scheme. The results show that the difference of the protection effect on the cable of different seabed soil material properties is significant, clay can effectively reduce the tensile stress on the cable, and gravel can effectively reduce the stress change amplitude and strain time of the plastic yielding stage of the cable, and it is proposed to backfill the submarine cable with layers of clay and gravel to protect the submarine cables; when the ratio of clay to gravel is 1∶2, the backfill protection can withstand the towing speed of 90 cm/s. The backfill protection can also be used to protect the submarine cable against the tugging of a ship with a speed of 90 cm/s. The backfill protection is also used for the protection of the submarine cable. When the ratio of clay to gravel is 1∶2, the backfill protection depth of 0.7 m can withstand the damage caused by the anchor drag with a speed of 90 cm/s, which provides theoretical references for the backfill protection engineering and operation and maintenance of submarine cable.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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