ACCELERATION RESPONSE CHARACTERISTICS OF COLLUVIAL LANDSLIDE BASED ON CENTRIFUGAL SHAKING TABLE MODEL TEST
TU Jiewen1，LIU Hongshuai2，TANG Aiping1，ZHENG Tong3
(1. School of Civil Engineering，Harbin Institute of Technology，Harbin，Heilongjiang 150090，China；2. National Earthquake Infrastructure Service，Beijing 100036，China；3. Institute of Engineering Mechanics，China Earthquake Administration，Harbin，Heilongjiang 150080，China)
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.
刘红帅，王根龙，薄景山. 汶川8.0级特大地震汉源背后山滑坡科考报告[R]. 中国地震局工程力学研究所，防灾科技学院，2008.(LIU Hongshuai，WANG Genlong，BAO Jingshan. Behind mountain landslide research report in Hanyuan county town during the Wenchuan Ms 8.0 earthquake[R]. Institute of Engineering Mechanics，China Earthquake Administration，Institute of Disaster Prevention Science and Technology，2008.(in Chinese))
<body>Your browse does not support frame!</body>
2015, Vol. 34 
