Abstract
The stability of the ancient flood control levees is mainly influenced by water level fluctuations, groundwater concentration and rainfalls. This paper takes the Lanxi ancient levee as a research object to study the evolution laws of its seepage, displacement and stability before and after reinforcement with the upside-down hanging wells and grouting curtain through numerical simulation methods combined with experiments and observations. The study results indicate that the filled soil is less affected by water level fluctuations and groundwater concentration after reinforcement. A high groundwater level is detrimental to the levee’s long-term stability, and the drainage issues need to be fully considered. The deformation of the reinforced levee is effectively controlled since the fill deformation is mainly borne by the upside-down hanging wells. The safety factors of the levee before reinforcement vary significantly with the water level. The minimum value of the safety factors is 0.886 during the water level decreasing period, indicating a very high risk of the instability. While it reached 1.478 after reinforcement, the stability of the ancient levee is improved by a large margin.
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Availability of Data/Materials: The datasets generated during this study are available from the corresponding author upon reasonable request and within the framework of cooperation agreements and scientific research projects.
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Acknowledgments
The authors thank the scientific research foundation of Zhejiang Provincial Natural Science Foundation of China (LTGG24E090002), Zhejiang University of Water Resources and Electric Power (xky2022013), Major Science and Technology Plan Project of Zhejiang Provincial Department of Water Resources (RA1904), the water conservancy management department, Zhejiang Design Institute of Water Conservancy and HydroElectric Power Co., Ltd. and the construction company for their support.
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Conceptualization and methodology was contributed by QIN Zipeng and TIAN Yan; formal analysis, investigation and data collection were contributed by GAO Siyuan, ZHOU Jianfen, HE Xiaohui, HE Weizhong and GAO Jingquan; writing original draft preparation, was contributed by QIN Zipeng and TIAN Yan; writing–review and editing, was contributed by all the authors; funding acquisition was contributed by QIN Zipeng, ZHOU Jianfen and GAO Jingquan; resources were contributed by GAO Siyuan, HE Xiaohui, HE Weizhong and GAO Jingquan; supervision was contributed by Yan Tian.
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Qin, Z., Tian, Y., Gao, S. et al. Stability behavior of the Lanxi ancient flood control levee after reinforcement with upside-down hanging wells and grouting curtain. J. Mt. Sci. 21, 84–99 (2024). https://doi.org/10.1007/s11629-023-8239-7
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DOI: https://doi.org/10.1007/s11629-023-8239-7