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Seismic performance of a nonhomogeneous slope reinforced by anchored piles using centrifuge tests

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Abstract

This paper conducts a series of centrifuge model tests to evaluate the seismic response characteristics of an anchor-pile-slope system. A real reinforced nonhomogeneous slope that remained stable during the 2008 Wenchuan earthquakes is utilized as the reference prototype. The recorded ground motion near the slope is selected as the seismic input. The responses in terms of slope acceleration and deformation, earth pressure, pile deformation and bending moment, and the anchor cable axial force are measured. The results have demonstrated that the slope vertical settlements and pile head displacements increase with increasing motion intensity. The maximum acceleration amplification is observed around the pile head, and the accelerations around the bedrock surface are attenuated. The largest dynamic earth pressure occurs at the pile head and then decreases with increasing depth due to the decreased soil-pile relative deformation. The presence of the anchor cable inhibits the build-up of dynamic earth pressure and leads to a negative bending moment. The maximum bending moment appears around the soil-rock interface because of the significant stiffness difference. Experimental results also illustrate that the axial force of the anchor cable is proportional to the pile head deformation. This work provides experimental evidence on the seismic behavior of a slope reinforced by anchored piles and will be beneficial to the calibration of numerical models and design methods.

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Data Availability

The data that support the findings of this study are available on request from the corresponding author.

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Funding

This work was supported by the Scientific Research Fund of the Institute of Engineering Mechanics, China Earthquake Administration (Grant No. 2020C02), the National Natural Science Foundation of China (Grant No. 51808515 and 41172293), the Joint Guiding Project of Natural Science Foundation of Heilongjiang Province (Grant No. LH2020E020), the Natural Science Foundation of Hebei Province (Grant No. E2020201017), and Hebei Provincial University Science and Technology Research Project (Grant No. ZD2020157).

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Authors and Affiliations

  1. Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin, 150080, China

    Tong Zheng, Wenhao Qi & Rui Sun

  2. Key Laboratory of Earthquake Disaster Mitigation, Ministry of Emergency Management, Harbin, 150080, China

    Tong Zheng, Wenhao Qi & Rui Sun

  3. Institute of Geotechnical Engineering, Hebei University, Baoding, China

    Qiangqiang Sun & Hongshuai Liu

Authors
  1. Tong Zheng
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  2. Qiangqiang Sun
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  3. Hongshuai Liu
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  4. Wenhao Qi
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  5. Rui Sun
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Correspondence to Qiangqiang Sun.

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Zheng, T., Sun, Q., Liu, H. et al. Seismic performance of a nonhomogeneous slope reinforced by anchored piles using centrifuge tests. Bull Eng Geol Environ 83, 64 (2024). https://doi.org/10.1007/s10064-024-03559-3

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  • DOI: https://doi.org/10.1007/s10064-024-03559-3

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