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 ef-fect. 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 instabili-ty characteristics and failure modes under seismic action after different stationary durations post-rain-fall. 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 de-creased 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.
base-covered slopesrainfall-seismic couplinginstability characteristicsshaking table test
万方数据
维普
