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

Linfeng Wang, Jixu Zhang (), Xiaoming Huang and Guojin Tan
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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

Sustainability, 2023, vol. 15, issue 21, 1-21

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.

Keywords: toppling dangerous rock mass; dynamic stability; Newmark- ? method; wavelet packet transform; Hilbert–Huang Transform; failure mode (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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