DYNAMIC RESPONSE CHARACTERISTICS OF DAGUANGBAO LANDSLIDE TRIGGERED BY WENCHUAN EARTHQUAKE
YIN Yueping1，WANG Meng2，LI Bin3，FENG Zhen3
(1. China Institute of Geological Environment Monitoring，Beijing 100081，China；2. Sichuan Geological Survey，Chengdu，
Sichuan 610081，China；3. Institute of Geomechanics，Chinese Academy of Geological Sciences，Beijing 100081，China)
Abstract：The complicate earthquake dynamic response is simulated with FLAC3D that is much different with simple/homogeneous slope due to poor amplitude effect along the height. For the horizontal acceleration response，the front of the landslide has greater vibrating frequency and amplitude，that is easier to trigger the slide along the inclined layer. For the vertical acceleration response，the back of the landslide has greater amplitude of vibration，and as three times as the absolute value of the acceleration in the front，that is easier cracking，fragmenting or even throwing rock mass. In light of the earthquake dynamic response and movement，the landslide accumulation and source are zoned as follows：(1) the lower inclined bedding sliding accumulation，which distributed in the East and dammed a tributary named the Huangdongzi；(2) the upper avalanche accumulation，which distributed in the Northwest and the North that overlay the North margin of previous sliding accumulation with belt-like；(3) the back cliff and talus，in which lots of cracks in the cliffs shows the tensive failures during the vibration；and lots of talus masses show gravity processes after the earthquake；(4) inclined bedding sliding surface and striation，which distributed at the back of the lower inclined bedding landslide. Enormous large-scale striation belts show the moving direction to North that is as same as the tendency of the layer.
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2012, Vol. 31 
