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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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In the current marine seismic engineering research, the influence of overlying seawater weight and soft soil on seabed ground motion is often ignored, which leads to unsafe seismic design. In this paper, four representative calculation models are constructed and the finite element method is used for numerical simulation analysis in order to evaluate the amplification effect of overlying sea water and seafloor soft soil layer on ground motion.
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https://doi.org/10.5194/nhess-2020-177
https://doi.org/10.5194/nhess-2020-177

  29 Jul 2020

29 Jul 2020

Review status: a revised version of this preprint was accepted for the journal NHESS and is expected to appear here in due course.

Study on the influence of seafloor soft soil layer on seismic ground motion

Jingyan Lan1, Juan Liu2, and Xing Song1 Jingyan Lan et al.
  • 1Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin University of Technology, Guilin, Guangxi 541004, China
  • 2Institute of Engineering Mechanics, China Earthquake Administration, Harbin, Heilongjiang 150080, China

Abstract. In the complex medium system of sea area, the overlying sea water and the surface soft soil have a significant impact on the seafloor ground motion, which brings great seismic risk to the safety of offshore engineering structures. In this paper, four sets of typical free field models are constructed and established, which are land model, land model with surface soft soil, sea model and sea model with surface soft soil. The dynamic finite difference method is used to carry out two-dimensional seismic response analysis of typical free field based on the input forms about P and SV wave. By comparing the seismic response analysis results of four groups of calculation models, the effects of overlying seawater and soft soil on peak acceleration and acceleration response spectrum are studied. The results show that when SV wave is input, the peak acceleration and response spectrum of the surface of soft soil on the surface and the seabed surface can be amplified, while the overlying sea water can significantly reduce the ground motion. When P wave is used, the effect of overlying seawater and soft soil on peak acceleration and response spectrum of surface and seabed can be ignored. The peak acceleration decreases first and then increases from the bottom to the surface, and the difference of peak acceleration calculated by four free field models is not obvious. The results show that the overlying sea water and the surface soft soil layer have little effect on the peak acceleration of ground motion below the surface.

Jingyan Lan et al.

 
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Jingyan Lan et al.

Jingyan Lan et al.

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Short summary
In the current marine seismic engineering research, the influence of overlying seawater weight and soft soil on seabed ground motion is often ignored, which leads to unsafe seismic design. In this paper, four representative calculation models are constructed and the finite element method is used for numerical simulation analysis in order to evaluate the amplification effect of overlying sea water and seafloor soft soil layer on ground motion.
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