Geomechanics and Engineering

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Seismic holding behaviors of inclined shallow plate anchor embedded in submerged coarse-grained soils

  • Zhang, Nan (School of Civil Engineering, Geotechnical and Structural Engineering Research Center, Shandong University) ;
  • Wang, Hao (School of Civil and Construction Engineering, Oregon State University) ;
  • Ma, Shuqi (Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, School of Civil Engineering, Southwest Jiaotong University) ;
  • Su, Huaizhi (State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University) ;
  • Han, Shaoyang (Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University)
  • Received : 2020.07.20
  • Accepted : 2021.12.20
  • Published : 2022.01.25
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Abstract

The seismic holding behaviors of plate anchor embedded into submerged coarse-grained soils were investigated considering different anchor inclinations. The limit equilibrium method and the Pseudo-Dynamic Approach (PDA) were employed to calculate the inertia force of the soils within the failure rupture. In addition, assuming the permeability of coarse-grained soils was sufficiently large, the coefficient of hydrodynamic force applied on the inclined plate anchor is obtained through adopting the exact potential flow theory. Therefore, the seismic holding resistance was calculated as the combination of the inertia force and the hydrodynamic force within the failure rupture. The failure rupture can be developed due to the uplift loads, which was assumed to be an arc of a circle perpendicular to the anchor and inclines at (π/4 - φ/2). Then, the derived analytical solutions were evaluated by comparing the static breakout factor Nγ to the published experimental and analytical results. The influences of soil and wave properties on the plate anchor holding behavior are reported. Finally, the dynamic anchor holding coefficients Nγd, were reported to illustrate the anchor holding behaviors. Results show that the soil accelerations in x and z directions were both nonlinear. The amplifications of soil accelerations were more severe at lower normalized frequencies (ωH/V) compared to higher normalized frequencies. The coefficient of hydrodynamic force, C, of the plate anchor was found to be almost constant with anchor inclinations. Finally, the seismic anchor holding coefficient oscillated with the oscillation of the inertia force on the plate anchor.

Keywords

Acknowledgement

This research is partially supported by the National Key Research and Development Program of China (SN: 2019YFC1510801), National Natural Science Foundation of China (SN: 51979093), the Fundamental Research Funds for the Central Universities (2682021CX003 and 2682021ZTPY049). The author would also acknowledge the anonymous reviewers for their valuable comments to improve this work.

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