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Thursday, July 11 • 09:00 - 09:20
NUMERICAL STUDY ON THE PORE WATER PRESSURE DISTRIBUTION IN SEABED AROUND THE GROUND ACOUSTIC SENSOR IN SHALLOW WATER

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With the rise of Marine science, the ground acoustic sensor used to monitor the complex activities of the seabed has been gradually spread all over the seabed. In order to study the stability of ground acoustic sensor in shallow water of seabed, the influence of waves in shallow water should be considered. Considering that the sensor is an elastomer and the seabed of the buried ground acoustic sensor is a porous medium, based on the Biot dynamic consolidation theory and the approximate elliptic cosine wave theory, we use the large-scale finite element software ANSYS to establish a numerical calculation model of the seabed pore water pressure around the ground acoustic sensor in shallow water. We discuss the distribution rules of super-static pore water pressure of seabed around the ground acoustic sensor under the action of shallow water wave, and analyze the influence of the contact between the sensor and soil, the characteristics of seabed soil and the buried depth and other factors on the distribution of super-static pore water pressure of seabed around the sensor. The results show that the interaction between the sensor and the seabed has very little influence on the distribution of super-static pore water pressure in the seabed around the sensor under the action of waves. The permeability of seabed, elastic modulus and buried depth have obvious influence on the distribution of super-static pore water pressure in the seabed around the sensor. The lower the permeability of seabed, the smaller the elastic modulus, and the shallower the buried depth, the more vulnerable the sensor is to instability.

Moderators
avatar for Simon Jones

Simon Jones

Associate Professor, Rose-Hulman Institute of Technology
Professional interests include undergraduate engineering education, finite element modeling, ground-borne vibrations, vibrations of musical instruments, and dynamics of toys.
GM

Guilhem Michon

Professor, ISAE-SUPAERO

Authors

Thursday July 11, 2019 09:00 - 09:20 EDT
St-Laurent 7
  T07 Struct. dyn. & nonlin. vib., RS03 Struct ac & vibr