1557. Pseudo-static calculation method of the seismic residual deformation of a geogrid reinforced soil retaining wall with a liquefied backfill

Liyan Wang1, Guoxing Chen2, Peng Gao3, Shangkun Chen4

1, 3, 4School of Civil and Architectural Engineering, Jiangsu University of Science and Technology,
Zhenjiang, China

2Institute of Geotechnical Engineering, Nanjing University of Technology, Nanjing, China

1Corresponding author

E-mail: 1wly_yzu@163.com, 2gxchen@njut.edu.cn, 3306131870@qq.com, 41047517921@qq.com

(Received 5 January 2015; received in revised form 15 February 2015; accepted 10 March 2015)

Abstract. The geogrid reinforced soil retaining wall is a flexible retaining wall. It will produce large deformations during earthquakes, especially on liquefied backfill soils. An index of liquefaction extent is applied to express the effect of excess pore water pressure in reinforced backfill sand during earthquakes. A geogrid reinforced soil retaining wall is represented by an isotropic vertical elastic beam. The calculation method of the seismic residual deformation of the geogrid reinforced soil retaining wall is based on the Rayleigh-Ritz method and the the Mononobe‑Okabe pseudo-static method. The effect of liquefaction extent in the backfill sand is studied for seismic active earth pressures acting on a reinforced wall back and seismic residual deformations of a reinforced wall. Some influence parameters on seismic residual deformations of geogrid reinforced soil retaining walls are investigated in detail, such as the internal friction angles in the backfill sand, friction angles of the wall, horizontal seismic intensities, reinforcement length of the geogrid and soil properties. Finally, the calculated results are compared with test results of a model on large-scale shaking table. The conclusions about the parameters will be helpful for seismic designs of geo-grid reinforced soil retaining walls on liquefied foundations. The proposed pseudo-static calculation method can be used to predict safe seismic deformations of geogrid reinforced soil retaining walls.

Keywords: earthquake, liquefied backfill, geogrid reinforced soil retaining wall, seismic residual deformation, extent of liquefaction, pseudo-static method.

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Cite this article

Wang Liyan, Chen Guoxing, Gao Peng, Chen Shangkun Pseudo‑static calculation method of the seismic residual deformation of a geogrid reinforced soil retaining wall with a liquefied backfill. Journal of Vibroengineering, Vol. 17, Issue 2, 2015, p. 827‑840.

 

JVE International Ltd. Journal of Vibroengineering. Mar 2015, Volume 17, Issue 2. ISSN 1392-8716