On the initiation mechanism of the Daguangbao landslide triggered by the 2008 Wenchuan (Ms 7.9) earthquake
On the initiation mechanism of the Daguangbao landslide triggered by the 2008 Wenchuan (Ms 7.9) earthquake
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2008年汶川7.9级地震引发大光堡滑坡的引发机制研究
DOI：
10.1016/j.soildyn.2020.106272
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发表时间：
2020-10-01
影响因子：
4
通讯作者：
Liang Yufei
中科院分区：
文献类型：
--
作者：
Zhu Ling;Pei Xiangjun;Liang Yufei
大广堡滑坡体积为1.16 x 10（9）m（3），面积为7.2 km（2），是2008年汶川地震引发的中国最大的滑坡。为了研究该滑坡的启动机制，进行了详细的现场调查和一系列的饱和三轴试验。野外调查表明，大广堡滑坡是沿沿着以砂土为主的糜棱岩带发生的。隧道内地下水丰富，糜棱岩带土壤含水量高。此外，实验结果表明，从糜棱岩带的土壤具有很高的液化潜力。动三轴试验条件下，土体中孔隙水压力迅速增大，可能导致土体破坏。因此，在地震荷载作用下，糜棱岩带内孔隙水压力的累积，促使土体抗剪强度不断降低，最终导致了大广堡滑坡的快速启动。
The Daguangbao landslide, with a volume of 1.16 x 10(9) m(3) and an area of 7.2 km(2), is the largest landslide triggered by the 2008 Wenchuan earthquake in China. To examine the initiation mechanism of this landslide, a detailed field investigation and a series of saturated triaxial tests were carried out. The field investigation revealed that the Daguangbao landslide initiated along a mylonite zone, the soil of which was mainly sand. Abundant groundwater was observed in the tunnel and the mylonite zone soils had high water contents. In addition, the experimental results showed that the soils from the mylonite zone have a high liquefaction potential. The pore water pressures in the soils under cyclic triaxial tests increased rapidly, which could have caused the soils failure. Therefore, the mechanism by which pore water pressure within the mylonite zone accumulates under seismic loading, which promotes a continuous decrease in the shear strength of soils, ultimately led to the rapid initiation of the Daguangbao landslide.