Influence of the rock mass structure and lithology on the dynamic response characteristics of steep rock slopes during earthquakes

SONG Danqing; HUANG Jin; LIU Xiaoli; WANG Enzhi

doi:10.16511/j.cnki.qhdxxb.2021.25.020

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Journal of Tsinghua University(Science and Technology) ›› 2021, Vol. 61 ›› Issue (8) : 873-880. DOI: 10.16511/j.cnki.qhdxxb.2021.25.020

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Influence of the rock mass structure and lithology on the dynamic response characteristics of steep rock slopes during earthquakes

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Abstract

Numerical models were used to study the influence of the rock mass structure and lithology on the seismic response characteristics of steep rock slopes for homogeneous soft/hard rock slopes and layered soft/hard rock slopes. The dynamic analyses used the finite element method. The predictions gave the dynamic acceleration amplification coefficient (M_PGA) of the slopes that characterized the influence of the rock structure and lithology on the wave propagation characteristics and the amplification effect. The results show that the rock structure and the lithology influence the wave propagation characteristics in the slopes with weak interlayer interactions leading to local amplification of the seismic waves in the slopes. The dynamic amplification effect is greater for soft rock slopes than for hard rock slopes. The lithology has more effect on the dynamic response of the slopes than the rock structure. The lithology also more greatly influences the seismic amplification of layered slopes than homogeneous slopes. The M_PGA ratios of homogeneous soft rock and homogeneous hard rock slopes are smaller than those of layered soft rock and layered hard rock slopes. The soft and hard rock slopes also show elevation and trend magnification effects. The elevation amplification effect of the layered slopes does not vary linearly as with homogeneous slopes. The weak interlayer interactions impact the slope amplification effect while the dynamic magnification effect of layered slopes with weak interlayer interactions is larger than for homogeneous slopes.

Key words

rock mass structure / lithology / high-steep rock slope / dynamic response / earthquake

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SONG Danqing, HUANG Jin, LIU Xiaoli, WANG Enzhi. Influence of the rock mass structure and lithology on the dynamic response characteristics of steep rock slopes during earthquakes[J]. Journal of Tsinghua University(Science and Technology). 2021, 61(8): 873-880 https://doi.org/10.16511/j.cnki.qhdxxb.2021.25.020

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