Assessing the influence of a rapid water drawdown on the seismic response characteristics of a reservoir rock slope usin
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RESEARCH PAPER
Assessing the influence of a rapid water drawdown on the seismic response characteristics of a reservoir rock slope using time–frequency analysis Danqing Song1 • Xiaoli Liu1
•
Bin Li2 • Jianmin Zhang1 • Juan Jose Volcan Bastos1
Received: 1 July 2020 / Accepted: 12 October 2020 Ó Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract To investigate the influence of a rapid water drawdown (RWD) on the seismic response characteristics of reservoir rock slopes, numerical dynamic analyses and shaking table tests are conducted on a rock slope containing discontinuities under a RWD using time–frequency analysis from the perspective of spectral and energy propagation characteristics. The results show that a RWD has a magnification effect on the seismic response of a surface slope, which is mainly manifested as the RWD causing the seismic energy of the surface slope to increase significantly. The RWD has a magnification effect on the Fourier spectrum amplitude of the low-order natural frequency band. A time–frequency domain analysis shows that the RWD has an influence on the characteristics of the seismic Hilbert energy spectrum (HES) in the low-frequency band of the surface slope and magnifies the amplitude of the marginal spectrum (MS) in the high-frequency band. In addition, the applicability of the Fourier spectrum, HES and MS in analysing the relationship between the RWD and the slope dynamic response is discussed. An analysis of the seismic HES shows that the RWD has a major impact on the overall dynamic response of the surface slope, while the RWD has a significant impact on the local dynamic response of the surface slope based on the Fourier spectrum and the MS. The influence mechanism of the RWD on the HES and MS of the slope is also discussed. Moreover, the influence of a RWD on the development process of seismic damage to the slope is clarified using an energy-based method. Keywords Complex geological structure Reservoir rock slope RWD Seismic response characteristics Spectral characteristics Time–frequency analysis
1 Introduction Due to the unique dynamic characteristics of earthquakes and specific terrain conditions in populated mountainous areas, earthquake-induced landslides are considered considerable natural threats to people, structures and infrastructures [2, 11]. Recent post-earthquake surveys have shown that earthquakes can induce a large number of secondary geological disasters in mountain slopes [5, 15].
& Xiaoli Liu [email protected] 1
State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
2
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
Landslides have been one of the more prevalent seismic hazards, such as those occurring after the 1999 Chi-chi earthquake and the 2008 Wenchuan earthquake in China [4, 16]. As a discontinuity with relatively low strength, weak structural planes are usually the weak part in a rock ma
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