Abstract
Soil-rock slope is a structure of slopes distributing widely in the world, but the calculation model of its stability is always set as uniform soil model under the influence of earthquake, and the effect of rock distribution on the slope can’t be considered comprehensively. Therefore, based on the method of finite element non-linear time-procedure, this paper analyses the acceleration response of slopes under the influence of earthquake with different rock distribution. Results show that the distribution of rocks have great influence on the accelerated response characteristic, and the main findings are as follows: (a) the accelerated time-history curve can filter the high frequency waves; (b) the free-surface has amplifying effect on seismic waves; (c) the acceleration response curves have different degrees of “biased”. Through above analysis, it’s expected to provide some reference for the stability analysis of soil-rock slope and reinforcement scheme under the influence of earthquake.
Highlights
Soil-rock slope is a kind of mixed-media slopes[1], consisting of rocks that have high strength and density, and soil particles which have low strength and small particles, which distributed widely in China[2]
The results showed that the slope has obvious amplifier effect on the seismic waves, and the amplifier effect was the smallest at the slope shoulder, and with the increase of the slope gradient, the amplifier effect of acceleration and velocity weakened gradually
By analyzing the acceleration responses of soil-rock slopes under the action of EI-centro seismic waves, conclusions are as follow: 1) Under seismic loading, the free surface of the slope makes its acceleration response characteristic different from the homogeneous soil slope, existing a high-frequency filter effect, seismic acceleration amplification effect, and the acceleration response related to the distributions of measures on the slope
Summary
Soil-rock slope is a kind of mixed-media slopes[1], consisting of rocks that have high strength and density, and soil particles which have low strength and small particles, which distributed widely in China[2]. Ren Ziming et al.[8]used large-scale shaking table tests to analyze the stability of the slope under seismic loading. The slope shaking table test about scale model can more reliably reflect the dynamic response characteristic of the slope under seismic loading. Chen Lingling[12] et al used the methods of time history analysis and response spectrum analysis to study the dynamic characteristics of the slope under seismic loading, and obtained the calculation formula for evaluating the stability of the rock slope. Based on the above reasons, according to the differences in distribution location of large rocks in soilrock slopes, this paper analyzes the accelerate response characteristics of slopes under seismic loading by using the nonlinear time history analysis function of MIDASGTS to guide the support engineering of soil-rock slopes
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