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Stability analysis and design optimization of multi-stage slope in gully land consolidation projects on the Loess Plateau

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Abstract

Many loess multi-stage slopes have been constructed in gully land consolidation projects on the Chinese Loess Plateau, which are vulnerable to failure induced by unreasonable excavation or rainfall. However, few studies have analyzed the influence of slope shape parameters and their design optimization on the stability of multi-stage slopes. We selected the Nangou catchment as a case study. Based on detailed field investigations, numerical analysis was conducted to reveal the influence of slope shape parameters (single stage slope height h, single stage slope ratio i, and berm width d) and platform setting on displacement, shear strain, plastic zone distribution, and the factor of safety (FS) of the multi-stage slope. Additionally, the sensitivity analysis method was used to compare and analyze the sensitivity of the slope shape parameters to FS. The results show that FS is negatively correlated with h and i and positively correlated with d. The sensitivity order of slope shape parameters to FS is i > d > h. The setting of a platform separates the shallow plastic zone of the slope into two independent parts to prevent larger landslides. In addition, based on the function relationship of FS with slope height and gradient: FS = a(tanθ)b (where a and b are functions of the slope height), the design optimization of the multi-stage slope with different slope heights and a comprehensive treatment are proposed. The research results could provide theoretical support for the design and prevention of related risks for excavation slopes in gully land consolidation projects.

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Funding

This work was supported by the National Natural Science Foundation of China (No. 42041006, 41790443), the National Key Research and Development Program, China (No. 2017YFD0800501), and the Innovation Capability Support Program of Shaanxi (No. 2021TD-50, 2021TD-51).

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Authors and Affiliations

  1. Department of Geological Engineering, Chang’an University, Xi’an, 710054, China

    Zhiyu Guo, Qiangbing Huang, Qingyu Xie & Daijin Yu

  2. Key Laboratory of Ecological Geology and Disaster Prevention, Ministry of Natural Resources, Xi’an, 710054, China

    Qiangbing Huang

  3. School of Water and Environment, Chang’an University, Xi’an, 710054, China

    Yue Liu

  4. Shaanxi Transportation Holding Group Construction Company, Xi’an, 710065, Shaanxi, China

    Zikan Jiang

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  1. Zhiyu Guo
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  2. Qiangbing Huang
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  5. Qingyu Xie
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Correspondence to Qiangbing Huang.

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Guo, Z., Huang, Q., Liu, Y. et al. Stability analysis and design optimization of multi-stage slope in gully land consolidation projects on the Loess Plateau. Bull Eng Geol Environ 82, 431 (2023). https://doi.org/10.1007/s10064-023-03451-6

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