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三峡库区的老房子滑坡位于奉节县新城核心地段,滑坡体表面积9.71×104m2,堆积厚度42~60m,体积约480×104m3,保证边坡稳定性有重要的意义。三峡水库蓄水后在老房子滑坡部位将会形成较大的地下水压力,特别是在库水位骤降情况下,坡体内将产生较大的动水压力,这对边坡稳定是非常不利的。通过数值模拟不同工况边坡地下水渗流场可知,库水位从175m骤降至145m时,老房子滑坡所受动水压力为正常蓄水位时的6.2倍,进行稳定计算时必须考虑动水压力的影响。
The old house landslide in the Three Gorges reservoir area is located in the core of Xinjie Town, Fengjie County. The landslide surface area is 9.71 × 104m2, the accumulated thickness is 42-60m and the volume is about 480 × 104m3. It is of great importance to ensure the stability of the slope. After the Three Gorges Reservoir is impounded, large groundwater pressure will be formed in the landslide site of the old house. Especially under the sudden drop of reservoir water level, large hydrodynamic pressure will be generated in the slope body, which is very unfavorable to slope stability. Through numerical simulation of seepage field of groundwater in different working conditions, when the reservoir water level plunges from 175m to 145m, the water pressure of old house landslide is 6.2 times that of normal water level, and the hydrodynamic pressure must be considered in the steady calculation Impact.