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Geomechanics and Engineering Volume 28, Number 2, January25 2022 , pages 197-207 DOI: https://doi.org/10.12989/gae.2022.28.2.197 |
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Seismic holding behaviors of inclined shallow plate anchor embedded in submerged coarse-grained soils |
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Nan Zhang, Hao Wang, Shuqi Ma, Huaizhi Su and Shaoyang Han
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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 (t/4 − o/2). Then, the derived analytical solutions were evaluated by comparing the static breakout factor Ny 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 Nyd, 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 (wH/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. | ||
| Key Words | ||
| inclined plate anchor; offshore anchors; pseudo-dynamic approach; seismic holding capacity; submerged soils | ||
| Address | ||
| Nan Zhang: School of Civil Engineering, Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, Shandong 250061, PR China; Department of Civil and Environmental Engineering, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, United States Hao Wang: School of Civil and Construction Engineering, Oregon State University, 101 Kearney Hall, Corvallis, OR 97331, United States Shuqi Ma: Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, School of Civil Engineering, Southwest Jiaotong University, Chengdu, 610031, China Huaizhi Su: State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China Shaoyang Han: Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China | ||