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Study on the Dynamic Stability and Spectral Characteristics of a Toppling Dangerous Rock Mass under Seismic Excitation

Author

Listed:
  • Linfeng Wang

    (Key Laboratory of Geological Hazards Mitigation for Mountainous Highway and Waterway, Chongqing Jiaotong University, Chongqing 400074, China)

  • Jixu Zhang

    (Key Laboratory of Geological Hazards Mitigation for Mountainous Highway and Waterway, Chongqing Jiaotong University, Chongqing 400074, China)

  • Xiaoming Huang

    (School of Transportation, Southeast University, Nanjing 211189, China)

  • Guojin Tan

    (College of Transportation, Jilin University, Changchun 130012, China)

Abstract

To evaluate the dynamic stability of dangerous rock masses under seismic excitation more reasonably, a mass viscoelasticity model was adopted to simulate the two main controlling surfaces of a toppling dangerous rock mass. Based on the principles of structural dynamics, a dynamic response analysis model and motion equations were established for toppling dangerous rock masses. The Newmark- β method was utilized to establish a calculation method for the dynamic stability coefficient of a toppling dangerous rock mass. This method was applied to the WY2 dangerous rock mass developed in a steep cliff zone in Luoyi Village, and the dynamic stability coefficient time history was calculated. Subsequently, the acceleration response signals of the dangerous rock mass in different directions were analyzed using wavelet packet transform. The results show that the sum of the energy proportions of the first to third frequency bands in the n 1 and s 2 directions exceeded 95%. This suggests that the n 1 and s 2 directions of the WY2 dangerous rock mass suffered the initial damage under bidirectional seismic actions. Finally, the marginal spectra variations of the acceleration response signals in different directions were analyzed based on the HHT. The results show that the seismic energy in the n 1 and s 2 directions of the dangerous rock mass was found to be the most significant under seismic loading, indicating that the rock mass experienced the most severe damage along these two directions. This reveals that the failure mode of the dangerous rock mass is inclined toppling, consistent with the results of wavelet packet analysis.

Suggested Citation

  • Linfeng Wang & Jixu Zhang & Xiaoming Huang & Guojin Tan, 2023. "Study on the Dynamic Stability and Spectral Characteristics of a Toppling Dangerous Rock Mass under Seismic Excitation," Sustainability, MDPI, vol. 15(21), pages 1-21, October.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:21:p:15397-:d:1269310
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    References listed on IDEAS

    as
    1. Yan Du & Mowen Xie, 2022. "Indirect method for the quantitative identification of unstable rock," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 112(1), pages 1005-1012, May.
    2. Yanchang Jia & Zhanhui Li & Tong Jiang & Yan Li & Shaokai Wang & Guihao Song, 2023. "Study on Early Identification of Landslide Perilous Rocks Based on Multi-Dynamics Parameters," Sustainability, MDPI, vol. 15(7), pages 1-13, April.
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