三峡库区树坪滑坡地下水渗流场分析

库岸边坡的地下水分布对其稳定性影响重大。以三峡库区树坪滑坡为例，基于Visual Modflow软件，对不同工况下的地下水渗流场进行数值模拟。结论表明：滑坡地下水位随着库水位波动而变化； 滑坡体后缘地下水受到影响较小，中部和前缘水头变化明显； 在库水位下降过程中，滑坡体内地下水随时间变化呈现水位不变、加速下降、降速减缓、稳定水位的趋势，且不同库水降速只对地下水位变化速率产生影响，对最终地下水位没有影响； 库水位降速越大，滑坡前缘地下水位变化越强烈，水力梯度也越大，且在滑坡东西两侧边界处形成的水力梯度最大。其成果将为库岸滑坡渗流场变化及稳定性分析提供一定的参考价值。

THE ANALYSIS OF GROUNDWATER SEEPAGE FIELD IN SHUPING LANDSLIDE IN THE THREE GORGES RESERVOIR

The distribution of groundwater has a great influence on the stability of the reservoir slope. Taking Shuping landslide for example, Visual Modflow software was adopted in numerical simulation calculation on seepage field under different conditions. The conclusions are as follows：the groundwater level changes with the reservoir water level fluctuations; the water level is less affected on the trailing edge of the landslide, while it's changed significantly on the middle and the front edge; in the process of reservoir water level falling, the relationship between the time and water level in the landslide shows the following characteristics：stable water level, falling down fast, slowly falling and stable water level. And the different falling speed only affects the water level change rate, while having not effect on the final water level; with the increase of reservoir water drop speed, the greater the landslide leading edge of the underground water level changes, the greater the hydraulic gradient becomes, and the hydraulic gradient becomes largest on the both side of the border of the landslide. And the paper also provides a reference for landslide groundwater seepage field changes and its stability analysis in Three Gorges Reservoir.