Failure mechanism on Qianjiangping landslide in the Three Gorges Reservoir region
Failure mechanism on Qianjiangping landslide in the Three Gorges Reservoir region
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发表时间：
2007
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通讯作者：
Peng Xuan-min
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作者：
Peng Xuan-min
体积为2400万立方米的千将坪滑坡发生在三峡水库从天然水位蓄水至139米高程时，是该地区近期最大的滑坡之一。该滑坡沿倾斜的页岩夹层发生平移，由上部的老滑坡和崩塌堆积体以及底部的基岩组成。其运动过程可分为三个区域：平移滑动、剪切滑动以及堵江和推挤。在不同情况下计算了稳定系数。在无降雨和蓄水的天然条件下，稳定系数K = 1.18，这可作为其他情况的基准。在6月21日至7月11日降雨量为162.7毫米的情况下，K = 0.97，与天然条件相比下降了20.9%。在无降雨但蓄水水位上升的情况下，K = 0.99，与天然条件相比下降了18.3%。在蓄水和降雨共同作用下，稳定系数K = 0.93，与天然条件相比下降了24.8%，这表明对滑坡有明显的触发作用。
The Qianjiangping landslide,24 million m~3 in volume,occurred while the storage of the Three Gorges Reservoir from nature to 139m elevation and was one of the largest landslide recently in this regions.The landslide is translational along the declining interbeded shale layer,consisted of the old sliding and falling accumulation in the upper and the bedrock on the bottom.The moving processes could be divided into three zone: the translational sliding,the shear sliding, and the river-damming and thrusting.The stability index is calculated under various situation.In the natural condition without rainfall and water storage,the stability index K=1.18,which could be the baseline for other situations.Under the rainfall with 162.7mm from June 21 to July 11,K=0.97,declining by 20.9%,compared with the natural condition.Under the water level rising of storage with no rainfall,K=0.99,declining by 18.3%,compared with the natural condition.The stability index K=0.93 under the combination of the storage and rainfall,declined by 24.8%,compared with the natural condition,which shows the obvious triggers on the sliding.