水射流冲埋砂质海床土体数值模拟

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Abstract Here, based on the SPH-FEM coupled algorithm, 2D models for water jet and seabed soil were established using the software ANSYS/LS-DYNA to study the process of water jet flushing sandy seabed soil, and analyze influence laws of stress wave characteristics, injection pressure and physical and mechanical indexes of sandy seabed soil on flushing rate. The results showed that stress wave inside seabed soil is formed along the center line of water jet, its energy is dissipated continuously in diffusion process, the maximum stress is at the contact point between water jet center line and seabed surface; the larger the injection pressure, the faster the flushing rate, flushing depth at the same time instant increases linearly with increase in injection pressure; for sandy seabed soil with the same compactness, flushing rate drops with increase in soil’s shear modulus, the larger the water jet velocity, the more significant the influence of shear modulus; for fine sandy seabed soil, flushing rate drops linearly with increase in sand’s cohesion and internal friction angle; soil porosity has smaller influence on flushing rate; compared with the depth of invasion published in literature, the correctness of the numerical model is verified; the relation expression between flushing depth and time is obtained through fitting numerical simulation results, and it can provide a reference for choosing a proper injection pressure under different seabed soil conditions.

Key words： water jet sandy seabed 2D model stress wave flush rate SPH-FEM coupling

Received: 02 January 2018 Published: 28 June 2019

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	Articles by authors
	CHI Yin1
	SHI Yuchuan1
	WU Haiyang2
	SU Jie3
	YU Min1
	LU Qiuru1

Cite this article:

CHI Yin1,SHI Yuchuan1,WU Haiyang2, et al. Numerical simulation for water jet flushing sandy seabed soil[J]. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(13): 253-260.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2019/V38/I13/253

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