AN EXPERIMENTAL STUDY ON THE MECHANISM OF RAPID AND LONG RUN-OUT LANDSLIDE TRIGGERED BY WENCHUAN EARTHQUAKE
AN EXPERIMENTAL STUDY ON THE MECHANISM OF RAPID AND LONG RUN-OUT LANDSLIDE TRIGGERED BY WENCHUAN EARTHQUAKE
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发表时间：
2010
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通讯作者：
S. Ping
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作者：
S. Ping
2008年汶川特大地震引发多发快速、长程滑坡,造成大量人员伤亡和财产损失。东河口滑坡是汶川地震引发的典型快速、长程滑坡,位于青川县,由于其成因机制复杂,目前备受关注和讨论。现场调查表明,其成因机制和动力特征主要有破碎崩塌、水平滑坡等。为了模拟和重建振动液化现象，采集了东河口滑坡滑带的代表性土体进行土体试验，利用先进的DPRI环剪仪，对真实地震波作用下东河口滑坡体的振动液化过程进行了一系列环剪试验研究，取得了较为理想的结果。潜在滑动面发生的液化对快速、长跳动滑坡的产生起着重要作用。土体干燥时,仅产生较小的位移(0.007m),无法形成高速、长跳动的滑坡;振动液化时,剪切强度下降,产生较大的位移,为快速、长跳动滑坡的发生提供了必要条件。
The 2008 great Wenchuan earthquake caused multiple rapid and long run-out landslides,which resulted in a lot of deaths and property loss.Donghekou landslide,a typical rapid and long run-out landslide triggered by Wenchuan earthquake,is located in Qingchuan county,and at present,it is concerned and discussed particularly because of its complex original mechanism.Field investigations show that the original mechanisms and dynamic features mainly include the followings,for example,the shattering collapse,the horizontal slinging,the debris flow and the vibration liquefaction,etc.In order to simulate and reconstruct the vibration liquefaction,representative soils on sliding zone of Donghekou landslide were collected for soil tests.By using the advanced DPRI ring shear apparatus,a series of ring shear tests have been carried out to study the vibration liquefaction process of Donghekou landslide under the loading of real seismic waves,and some ideal results were gotten.The test results show that when the earthquake happened,the vibration liquefaction occurring on the potential sliding surface played an important role in generating the rapid and long run-out landslide.When the soils were dry,only a small displacement(0.007m)was generated,which couldn't form a landslide with high speed and long run-out;with the vibration liquefaction,the shear strength could be decreased and a large displacement could be generated,which supplied a necessary condition for the generation of rapid and long run-out landslide.