Discrete element numerical simulation of the accumulation process of wave-induced pore water pressure in the seabed

Wang Yue; Liu Chun; Liu Xiaolei; Liu Hui; Li Yasha

doi:10.12284/hyxb2021160

Volume 43 Issue 11

Dec. 2021

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Wang Yue，Liu Chun，Liu Xiaolei, et al. Discrete element numerical simulation of the accumulation process of wave-induced pore water pressure in the seabed[J]. Haiyang Xuebao，2021, 43(11)：88–95 doi: 10.12284/hyxb2021160

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Discrete element numerical simulation of the accumulation process of wave-induced pore water pressure in the seabed

doi: 10.12284/hyxb2021160

Wang Yue^1
,,
Liu Chun^{1
,
,},
Liu Xiaolei²,
Liu Hui¹,
Li Yasha²

1.
School of Earth Science and Engineering, Nanjing University, Nanjing 210023, China
2.
College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China

Received Date: 2020-12-02
Rev Recd Date: 2021-02-09

Available Online: 2021-08-10

Publish Date: 2021-12-31

Abstract

Abstract

The seabed soil layer will gradually accumulate pore pressure under the action of wave cyclic load, reduce the stability of the soil layer, and threaten offshore engineering. In order to study the accumulation mechanism of pore water pressure, the discrete element pore density flow method was proposed, and the discrete element analysis software MatDEM was improved to realize the simulation of the accumulation process of seabed sediment pore pressure. Based on the field test device and the mechanical parameters of the soil body, a discrete element model was established. By comparing field test and numerical simulation results, it was found that after applying the wave load to the seabed sediment, a higher pore pressure was generated in the surface soil body and gradually transferred to the deep layer. Under the action of cyclic wave load, the cumulative range of pore pressure between soil particles gradually increased. When the pore pressure accumulation time was long enough, the pore pressure in the soil layer converged to the average of the maximum and minimum loads applied. As the number of load cycles increased, the pore pressure at all depths increased cumulatively until the soil body liquefied and the internal soil particles became resuspended sediments. Under the action of periodic wave loads, the soil particles moved after being liquefied and suspended, and the shallow particles had a large displacement, and the overall performance of the soil was circular arc movement.
- discrete element,
- numerical simulation,
- wave action,
- pore water pressure,
- MatDEM

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References(18)

References

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