Numerical Analysis of Force of Fluidized Solidified Slurry in Pumping for Scour Repair on Offshore Pile Foundation

doi:10.16183/j.cnki.jsjtu.2022.280

Abstract

Abstract:

As a novel scour protection measure, the fluidized solidified slurry is pumped into the developed scour holes around the pile foundation for scour repair as the fluidized material solidifies gradually. In the process of pumping operation, the fluidized solidified slurry will have a negative effect on the pile. However, there is still a lack of comprehensive study on the force acting on the pile in this process. The CFD model is adopted to simulate the flow and diffusion of the solidified slurry pumped into the scour pit around the monopile. The effects of pumping velocity, current velocity, and material property of solidified slurry on the force acting on the pile are systematically investigated, of which, current velocity is the most sensitive factor. A simplified analysis method for force of fluidized solidified slurry acting on the monopile is proposed, providing basis for the design and construction of the pumping operation.

Key words: fluidized solidified slurry, scour protection, CFD method, offshore pile foundation, force

CLC Number:

TU432

LI Ruyu, WU Xiaoni, CHEN Jinjian, JIANG Haili, WANG Huili. Numerical Analysis of Force of Fluidized Solidified Slurry in Pumping for Scour Repair on Offshore Pile Foundation[J]. Journal of Shanghai Jiao Tong University, 2023, 57(12): 1609-1618.

Figures/Tables 14

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类型	流变模型	μ/(Pa·s)	τ₀/Pa	ρ/(kg·m^-3)	D_s/mm
S0	Bingham	0.125	75	1 400	200
S1	Bingham	0.253	242.642	1 400	190
S2	Bingham	0.350	412.087	1 400	170

工况	v_c/(m·s^-1)	v_m/(m·s^-1)	固化土类型
1	1	2.5	S0
2	0.5	2.5	S0
3	1.5	2.5	S0
4	2	2.5	S0
5	2.5	2.5	S0
6	1	1.5	S0
7	1	2	S0
8	1	2.25	S0
9	1	2.75	S0
10	1	3	S0
11	1	2.5	S1
12	1	2.5	S2

水平	A	B	C
水平	v_c/(m·s^-1)	v_m/(m·s^-1)	固化土类型
1	1	2	S2
2	1.5	2.5	S1
3	2.5	3	S0

工况	v_c/(m·s^-1)	v_m/(m·s^-1)	固化土类型
2-1(A1B1C1)	1	2	S2
2-2(A1B2C3)	1	2.5	S0
2-3(A1B3C2)	1	3	S1
2-4(A2B1C3)	1.5	2	S0
2-5(A2B2C2)	1.5	2.5	S1
2-6(A2B3C1)	1.5	3	S2
2-7(A3B1C2)	2.5	2	S1
2-8(A3B2C1)	2.5	2.5	S2
2-9(A3B3C3)	2.5	3	S0