库区滑坡的次生灾害分析与研究——以藕塘滑坡为例

Analysis and Research on Secondary Disasters of Landslide in Reservoir Area

滑坡除直接成灾外,还会产生次生灾害,滑坡体落入江河中,可形成巨大涌浪,造成较大的危害。涌浪高度除受滑速、失稳体积、水深等重要因素的影响外,波浪的形成还要受水库地形、库面宽度、滑坡入库过程的持续时间以及滑坡体的宽度等因素的影响,尤其在峡谷地区更为显著,且波浪在传播过程中,还受到河谷两岸的阻碍、往返的折射以及波群的相互干扰或迭加等影响。以藕塘滑坡为例,在滑波局部失稳情况下采用潘家铮涌浪算法,计算和预测滑体冲入库区后的滑速和造成的涌浪高度,并且考虑了地震作用和滑坡前缘泡在水中所产生的阻力。

Landslide is not only a direct disaster, but also can cause secondary disasters, huge surge formed by landslide body falling into the river will bring great harm.The surge height is affected by sliding speed, failure volume, water depth and other important factors; the formation of waves is affected by reservoir terrain, reservoir width, the duration of landslide falling into the reservoir and the width of landslide.Especially in the canyon area, in the wave propagation process, waves are also affected by the obstacles on both sides of the valley, round-trip refraction and wave group mutual interference or su-perposition.In this paper, Pan Jiazheng surge algorithm is used, under the condition of local landslide instability in Out-ang, the sliding velocity and surge height by landslide rushing into the reservoir are calculated and predicted; the earth-quake action and the resistance of leading edge in reservoir water are considered.