Mechanism for the rapid motion of the Qianjiangping landslide during reactivation by the first impoundment of the Three Gorges Dam reservoir, China
Mechanism for the rapid motion of the Qianjiangping landslide during reactivation by the first impoundment of the Three Gorges Dam reservoir, China
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DOI：
10.1007/s10346-008-0130-7
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发表时间：
2008-06
期刊：
影响因子：
6.7
通讯作者：
Fawu Wang;Yeming Zhang;Zhitao Huo;Xuanming Peng;Shimei Wang;S. Yamasaki
中科院分区：
文献类型：
--
作者：
Fawu Wang;Yeming Zhang;Zhitao Huo;Xuanming Peng;Shimei Wang;S. Yamasaki
中国三峡水库首次蓄水始于2003年6月1日，水面高程为95米，到2003年6月15日达到135米。在水位达到135米后不久，许多斜坡开始变形，并发生了一些滑坡。钱江坪滑坡是最大的滑坡；它发生在2003年7月14日凌晨，造成了巨大的生命财产损失。现场调查表明，虽然在储层达到135 m后发生破坏，但边坡的稳定性已经被预先存在的剪切层理面所降低。为研究该恢复滑坡的快速运动机理，分别在滑坡带的黄粘土层和黑粉土层取2个土样，进行了一系列环剪试验。一组环剪试验模拟蠕变变形行为，另一组环剪试验模拟不同剪切速率。环剪试验分析表明，恢复滑坡快速运动的机制是由蠕变破坏后运动阶段的黑粉土层的速率效应引起的。黄粘土层在2003年的快速运动中没有发挥任何重要作用。
The first impoundment of the Three Gorges Dam reservoir in China started from a water surface elevation of 95 m on June 1, 2003 and reached 135 m on June 15, 2003. Shortly after the water level reached 135 m, many slopes began to deform and some landslides occurred. The Qianjiangping landslide is the largest one; it occurred on the early morning of July 14, 2003 and caused great loss of lives and property. Field investigation revealed that, although failure occurred after the reservoir reached 135 m, the stability of the slope was already reduced by preexisting sheared bedding planes. To study the mechanism of the rapid motion of this reactivated landslide, two soil samples were taken from a yellow clay layer and a black silt layer in the sliding zone, respectively, and a series of ring shear tests were conducted on the samples. One series of ring shear tests simulates the creep deformation behavior, while the other series simulates different shear rates. Conclusions drawn from analysis of the ring shear tests indicate that the mechanism of the rapid motion of the reactivated landslide was caused by the rate effect of the black silt layer during the motion phase after the creep failure. The yellow clay layer did not play any important role in the rapid motion in the 2003 event.