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Bulletin of Engineering Geology and the Environment

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28-10-2020 | Original Paper

Characteristics of wave propagation through rock mass slopes with weak structural planes and their impacts on the seismic response characteristics of slopes: a case study in the middle reaches of Jinsha River

Authors: Danqing Song, Xiaoli Liu, Jin Huang, Enzhi Wang, Jianmin Zhang

Published in: Bulletin of Engineering Geology and the Environment | Issue 2/2021

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Abstract

Time-frequency joint analysis was used to investigate the seismic response of rock slopes containing weak structural planes. Four three-dimensional finite element models containing infinite element boundaries were modelled: homogeneous slope, anti-dip slope, bedding slope, and block slope models. The material of the models was elastic material. The influence of the structural planes on the seismic responses of the slopes was systematically analyzed. The results of time-frequency joint analysis show that the structural planes impact the propagation characteristics of the waves and the dynamic amplification effect of the slopes. The wave propagation characteristics and peak ground acceleration distribution of the block slope model are more complex than those of the other models. The influence of structural planes on the amplification effect of the slopes is discussed. Additionally, according to frequency-domain analysis, structural planes have a small impact on the natural frequencies and the peak Fourier spectrum amplitude distribution of the slope but have a significant influence on its dynamic deformation characteristics. The natural frequencies of slopes can be obtained by using modal analysis and Fourier spectrum analysis. The relationships between the natural frequencies of the slopes and their dynamic deformation characteristics were analyzed; in particular, the impacts of low-order and high-order natural frequency on the deformation of the surficial slope were investigated. The applicability of the energy spectrum in the evaluation of the dynamic deformation characteristics of slopes was discussed. The effects of structural planes on the seismic failure mode of the slopes are identified according to the analyses of the dynamic responses of the slopes.

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Title: Characteristics of wave propagation through rock mass slopes with weak structural planes and their impacts on the seismic response characteristics of slopes: a case study in the middle reaches of Jinsha River
Authors: Danqing Song
Xiaoli Liu
Jin Huang
Enzhi Wang
Jianmin Zhang
Publication date: 28-10-2020
Publisher: Springer Berlin Heidelberg
Published in: Bulletin of Engineering Geology and the Environment / Issue 2/2021
Print ISSN: 1435-9529
Electronic ISSN: 1435-9537
DOI: https://doi.org/10.1007/s10064-020-02008-1

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