Safety Analysis of Wreck Salvage Process Based on Skempton Function

doi:10.16183/j.cnki.jsjtu.2023.S1.18

Abstract

Abstract:

In order to evaluate the safety of salvage operation, a numerical model of the coupling dynamic response characteristics of the “Yangtze River Estuary II” salvage system is established based on the three-dimensional potential flow theory and the Skempton formula. The model has been verified by actual measurement and is used in the safety analysis of the whole salvage process. The research results show that special attention needs to be paid to the motion response of the salvage system and the tension changes of the lifting and mooring lines in the two stages of bottom-off and partial water-out in the overall salvage process. With the increase of wave height and spectral peak period, the motion response of the salvage system and the extreme value of cable tension increase. The influence of wave direction on the six-degree-of-freedom movement of the system is more complicated, and the extreme value of the tension of the lifting cable increases significantly under the action of oblique waves. According to the calculation of the safety factor of the cable, when formulating a salvage plan, an appropriate lifting speed should be selected, and at the same time, salvage operations should be avoided in waves of 20°—70°.

Key words: wreck salvage, Skempton formula, coupling analysis, safety analysis

CLC Number:

U674.23

PAN Jie, WANG Lei, WANG Yiting, ZHOU Dongrong, ZHU Xiaodong. Safety Analysis of Wreck Salvage Process Based on Skempton Function[J]. Journal of Shanghai Jiao Tong University, 2023, 57(S1): 94-107.

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类型	参数	取值
打捞驳船	总长/m	120.00
	型宽/m	34.00
	型深/m	9.00
	排水量/t	6 000.00
沉船	总长/m	46.00
	型宽/m	17.00
	型深/m	8.50
	排水量/t	9 500.00
系泊缆	长度/m	800.00
	直径/mm	120
	轴向刚度/GN	1.46
	最小破断强度/kN	9 720
	单位长度质量/(kg·m^-1)	273.95
提升缆	长度/m	107.00
	直径/mm	78
	轴向刚度/MN	246
	最小破断强度/kN	5 721
	单位长度质量/(kg·m^-1)	133.20

工况	波浪					风		流		提升速度/ (m·s^-1)
工况	波高/m	谱峰周期,T/s	浪向角/(°)	谱峰因子		风速/(m·s^-1)		流速/(m·s^-1)		提升速度/ (m·s^-1)
DP1	0.1	9	90	3.3	10.8		0.77		0.01
DP2	0.5	9	90	3.3	10.8		0.77		0.01
DP3	1	9	90	3.3	10.8		0.77		0.01
DP4	0.5	5	90	3.3	10.8		0.77		0.01
DP5	0.5	7	90	3.3	10.8		0.77		0.01
DP6	0.5	11	90	3.3	10.8		0.77		0.01
DP7	0.5	9	90	3.3	10.8		0.77		0.005
DP8	0.5	9	90	3.3	10.8		0.77		0.05
DP9	0.5	9	90	3.3	10.8		0.77		0.1
DP10	0.5	9	0	3.3	10.8		0.77		0.01
DP11	0.5	9	10	3.3	10.8		0.77		0.01
DP12	0.5	9	20	3.3	10.8		0.77		0.01
DP13	0.5	9	30	3.3	10.8		0.77		0.01
DP14	0.5	9	40	3.3	10.8		0.77		0.01
DP15	0.5	9	50	3.3	10.8		0.77		0.01
DP16	0.5	9	60	3.3	10.8		0.77		0.01
DP17	0.5	9	70	3.3	10.8		0.77		0.01
DP18	0.5	9	80	3.3	10.8		0.77		0.01

工况	波高/m	谱峰周期T/s	浪向角/ (°)	提升速度/ (m·s^-1)	系泊缆张力极值/kN	系泊缆安全系数	提升缆张力极值/kN	提升缆安全系数
DP1	0.1	9	90	0.01	582.10	16.70	3 957.65	1.45
DP2	0.5	9	90	0.01	710.76	13.68	4 162.30	1.37
DP3	1.0	9	90	0.01	902.90	10.77	4 371.29	1.31
DP4	0.5	5	90	0.01	605.63	16.05	4 028.12	1.42
DP5	0.5	7	90	0.01	646.57	15.03	4 133.80	1.38
DP6	0.5	11	90	0.01	769.24	12.64	4 062.40	1.41
DP7	0.5	9	90	0.005	718.19	13.53	3 523.41	1.62
DP8	0.5	9	90	0.05	721.97	13.46	4 379.50	1.31
DP9	0.5	9	90	0.1	672.52	14.45	4 825.92	1.19
DP10	0.5	9	0	0.01	573.49	16.95	4 075.73	1.40
DP11	0.5	9	10	0.01	586.45	16.57	4 039.18	1.42
DP12	0.5	9	20	0.01	599.96	16.20	5 198.95	1.10
DP13	0.5	9	30	0.01	636.16	15.28	6 961.31	0.82
DP14	0.5	9	40	0.01	670.23	14.50	8 273.32	0.69
DP15	0.5	9	50	0.01	674.32	14.41	9 143.16	0.63
DP16	0.5	9	60	0.01	670.20	14.50	7 211.56	0.79
DP17	0.5	9	70	0.01	670.79	14.49	5 256.72	1.09
DP18	0.5	9	80	0.01	671.38	14.48	4 107.06	1.39