Abstract
The sliding of bedding rock slopes is primarily influenced by the presence of weak interlayers, which exhibit strong destructiveness, and complex sliding mechanisms, and pose difficulties in terms of reinforcement and treatment. This study aimed to examine the deformation characteristics and failure mechanism of the bedding rock slope at Mayanpo, located on the right bank of the Xiangjiaba Hydropower Station. To this end, field investigation, geological survey, and long-term monitoring were conducted. The results of the study revealed that Mayanpo slope is comprised of sandstone and soft mudstone interbedded layers, with an inclination that is almost equivalent to that of the rock layer. The overall slope stability is controlled by the weak interlayer (JC-1), which exhibits traction-based sliding. In light of this failure mechanism, a numerical simulation analysis of slope stability was performed and reinforcement measures, such as the implementation of anti-slide piles in combination with prestressed anchor cables and drainage tunnels, were designed. The slope deformation was continuously monitored following the reinforcement treatment. The monitoring data indicated that the slope experienced dynamic balance adjustment, leading to secondary deformations at the surface of the overburden and the weak geological parts under the weak interlayer. However, after 6 years of reinforcement, the overall dynamic adjustment of the Mayanpo slope was completed and the deformation stabilized. This research provides valuable insights into the deformation characteristics and failure mechanism of bedding rock slopes and demonstrates the effectiveness of the proposed reinforcement measures in stabilizing the slope.
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Funding
The work presented in this paper was financially supported by National Natural Science Foundation of China (Grant No. U1965204); Open Research Fund of State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin (China Institute of Water Resources and Hydropower Research, Grant No: IWHR-SKL-KF202016 and SKL2022ZD05), Scientific Research Project of China Institute of Water Resources and Hydropower Research (No. GE110145B0022021), and State Grid Company Limited Headquarters Management Technology Projects (No. 5108-202218280A-2-301-XG).
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Long Jiang: Conducted feld studies and experiments. Chaojun Jia: Conducted field studies, data interpretation, and manuscript writing. Qiang Zhang: Read the manuscript and provide comments. Jun Yu: Read the manuscript and provide comments. Qingfu Huang: Drawing and preparing all fgures and data interpretation.
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Jiang, L., Zhang, Q., Jia, C. et al. Investigating on deformation characteristics and failure mechanism of bedding rock slope: field study, long-term monitoring, and reinforcement measures. Environ Earth Sci 83, 45 (2024). https://doi.org/10.1007/s12665-023-11372-6
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DOI: https://doi.org/10.1007/s12665-023-11372-6