ZHAO Hongyu,WANG Guoyi,YANG Bing,et al.Study on Dynamic Instability Failure of Base‑covered Slope at Different Duration after Rainfall[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(04):933-939.
ZHAO Hongyu,WANG Guoyi,YANG Bing,et al.Study on Dynamic Instability Failure of Base‑covered Slope at Different Duration after Rainfall[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(04):933-939. DOI: 10.13409/j.cnki.jdpme.20230301003.
Study on Dynamic Instability Failure of Base‑covered Slope at Different Duration after Rainfall
The instability failure process and characteristics of base-covered slopes
characterized by a loose upper deposit and underlying bedrock
differ significantly from other slopes under rainfall and seismic action. The time interval between rainfall and earthquake significantly affects their coupling effect. Using a self-made model box
shaking table model tests were conducted on base-covered slopes to study the influence of different rainfall cessation durations on slope stability
as well as the instability characteristics and failure modes under seismic action after different stationary durations post-rainfall. The test results showed that the failure mode of the slope exhibited transitional failure regardless of the time interval between rainfall and earthquake. After reaching a certain rainfall intensity
the soil moisture content and pore water pressure of the slope increased sharply during the rainfall
and decreased continuously to a stable state with the increasing stationary duration after rainfall stopped. With the increase of the stationary duration
the critical acceleration of slope instability increased
showing a positive correlation with the stationary duration.
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