基于离心振动台的堆积型滑坡加速度响应特征

doi:10.13722/j.cnki.jrme.2014.1273

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Abstract The law of acceleration response can be used to analyse landslide damage mechanisms and determine the earthquake influencing coefficient reasonably. Hence，a centrifuge shaking table model test of colluvial landslide was designed and carried out on a centrifuge shaking table at 50 gravitational accelerations in order to research its acceleration response characteristics. The model landslide was installed into a rigid aluminum alloy container with the length of 600mm，width of 400mm and height of 500mm. Bedrock wave (Qingxi wave) was inputted from the bottom of the model to study the dynamic response behavior of the colluvial landslide under earthquakes of different intensities by scaling the amplitude of the input seismic wave. And the bedrock wave was derived from the one recorded by Qingxi station during the Wenchuan earthquake. Results show that both the horizontal and vertical peak ground acceleration (PGA) amplification coefficients at landslide surface increase with the increasing height of landslide. The landslide shows an obvious elevation amplification effect，i.e.，the increasing rate of PGA amplification coefficients becomes notably larger approaching the slope crest. The acceleration response characteristics of the landslide surface and landslide body are significantly different under earthquake，which shows the surface effect. The horizontal acceleration at bedrock has amplification effect on input seismic wave along the height of the landslide，but it is weaken much weaker by comparison with that at the landslide surface. The slope crest has an obvious wave mode conversion phenomenon to the input seismic wave. The PGA amplification coefficients along landslide surface decrease with the increasing of the earthquake amplitudes. The results are helpful to reveal acceleration response characteristics of the same type of colluvial landslide under earthquake，and provided valuable references for determining the earthquake influence coefficient and analysing landslide damage mechanisms.

Key words： colluvial landslide centrifuge shaking table acceleration response model test

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2014.1273 OR http://www.rockmech.org/EN/Y2015/V34/I07/8

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