Abstract
Liquefaction of seabed sediments under the action of storm waves is an important form of seabed instability, which may cause damage to submarine structures such as pipelines and cables. A commonly used parameter to identify sediment liquefaction is pore pressure. The pressure response of the pore water at different depths of a silty soil seabed under storm waves was monitored by a probe rod in the Yellow River delta. The probe is made of a steel pipe with a length of 8 m and an outer diameter of 10 cm, which is equipped with 10 pore pressure sensors. According to the collected data, under a water depth of 8 m, silty soil seabed liquefaction starts when the significant wave height reaches 0.5 m, and the liquefaction depth is between 3.3 and 3.8 m under waves with a significant wave height of 3.65 m. Seabed liquefaction develops in a top-down manner, and the average development rate of the liquefaction depth is approximately 0.17 m/min.
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Abbreviations
- d :
-
grain size
- h :
-
water depth
- H :
-
wave height
- \( \overline{H} \) :
-
average wave height
- H max :
-
maximum wave height
- H 1/3 :
-
significant wave height
- K :
-
coefficient of permeability
- K P :
-
pressure coefficient
- k 0 :
-
lateral earth pressure coefficient at rest
- P :
-
magnitude of the pressure change at the water bottom
- P e :
-
excess pore pressure
- \( {\overline{P}}_e \),:
-
residual excess pore pressure
- P m :
-
measured pore pressure
- P z :
-
magnitude of the pressure change at burial depth z
- P 0 :
-
static pore pressure
- T :
-
wave period
- \( \overline{T} \) :
-
average wave period
- T 1/3 :
-
significant wave period
- v :
-
development rate of liquefaction depth
- W g :
-
water content
- z :
-
burial depth of the sensor
- γ :
-
unit weight
- γ s :
-
effective unit weight of soil
- γ w :
-
effective unit weight of sea water
- σ ′ :
-
effective stress
- σ v0 ′ :
-
initial vertical effective stress
- σ 0 ′ :
-
initial effective stress
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Funding
This study was funded by the National Natural Science Foundation of China (Grant No. 41576039).
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Xu, X., Xu, G., Yang, J. et al. Field observation of the wave-induced pore pressure response in a silty soil seabed. Geo-Mar Lett 41, 13 (2021). https://doi.org/10.1007/s00367-020-00680-6
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DOI: https://doi.org/10.1007/s00367-020-00680-6