Acceleration response of colluvial landslide based on centrifugal shaking table test

The acceleration response can be used to analyze the mechanisms of a landslide and to determine the coefficients of earthquake influence reasonably. The centrifuge shaking table test of 50g modelling the colluvial landslide was carried out. The landslide model was placed in a rigid aluminum alloy container with the length of 600 mm, width of 400 mm and height of 500 mm. The bedrock wave recorded at Qingxi station during the Wenchuan earthquake was exerted from the bottom of the model. The amplification coefficients of the horizontal and vertical peak ground acceleration(PGA) at landslide surface were found to increase with the increasing of the elevation. The increasing rate of the amplification coefficients of PGA at the measured spots near the slope crest was notably larger. The acceleration response at the slope surface was significantly different from that inside the landslide. The horizontal acceleration at bedrock had the amplification effect along the elevation of the landslide, but was much smaller than that at the landslide surface. A phenomenon of wave mode transformation was found at the crest of the landslide. The amplification coefficients of PGA at the crest of landslide increased firstly and subsequently decreased with the increasing of the amplitudes of the input seismic wave.