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Estimation of Active Earth Pressure for Narrow Unsaturated Backfills Considering Soil Arching Effect and Interlayer Shear Stress

Author

Listed:
  • Daxi Fu

    (School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
    Henan Provincial Transportation Planning and Design Institute Co., Ltd., Zhengzhou 450015, China)

  • Minghui Yang

    (School of Architecture and Civil Engineering, Xiamen University, Xiamen 361005, China)

  • Bo Deng

    (College of Civil Engineering, University of South China, Hengyang 421001, China)

  • Hutao Gong

    (Henan Provincial Transportation Planning and Design Institute Co., Ltd., Zhengzhou 450015, China)

Abstract

Affected by climatic conditions such as rainfall, evaporation and air temperature, most of the backfill soil is in an unsaturated state, and the decrease in matric suction leads to the failure of the retaining structure. In view of this, this study takes the vertical rigid retaining wall with narrow unsaturated backfill as the research object, assuming that the backfill behind the wall forms a circular soil arch and considering the interlayer shear stress; thus, the analytical solution of the active earth pressure of narrow unsaturated soil is derived based on the thin layer element method. The reliability of this method is verified by comparing with the experimental and existing theoretical results. A parameter analysis demonstrates that with the increase in the interface friction angle of the moving wall–soil, the average shear stress coefficient of zone I and zone II increases gradually, but with the increase in the interface friction angle of the fixed wall–soil, the average shear stress coefficient of zone I decreases; with the increase in effective internal friction angle and effective cohesion, the active earth pressure decreases and the tension crack depth increases; with the increase in the interface friction angle, the active earth pressure in the upper part of the retaining wall increases slightly, while the active earth pressure in the lower part decreases obviously; with the increase in matric suction, the active earth pressure first decreases rapidly and then increases gradually, and the tension crack depth first increases and then decreases, but the distribution pattern of the horizontal active earth pressure remains unchanged; the active earth pressure decreases with the decrease in the aspect ratio, and when the aspect ratio is smaller, the attenuation is more obvious; until the aspect ratio reaches a certain value, the active earth pressure is basically unchanged.

Suggested Citation

  • Daxi Fu & Minghui Yang & Bo Deng & Hutao Gong, 2022. "Estimation of Active Earth Pressure for Narrow Unsaturated Backfills Considering Soil Arching Effect and Interlayer Shear Stress," Sustainability, MDPI, vol. 14(19), pages 1-18, October.
  • Handle: RePEc:gam:jsusta:v:14:y:2022:i:19:p:12699-:d:934553
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    References listed on IDEAS

    as
    1. Zeyue Wang & Xinxi Liu & Weiwei Wang & Ziyu Tao & Song Li, 2022. "Inclined Layer Method-Based Theoretical Calculation of Active Earth Pressure of a Finite-Width Soil for a Rotating-Base Retaining Wall," Sustainability, MDPI, vol. 14(15), pages 1-25, August.
    2. Yi Tang & Jiangong Chen, 2018. "A Computational Method of Active Earth Pressure from Finite Soil Body," Mathematical Problems in Engineering, Hindawi, vol. 2018, pages 1-7, May.
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