上软下硬型边坡渗流特征分析

Analysis of seepage characteristics of slope with soft on top and hard on bottom

库水边坡常因为其渗流场变化而出现岩体变形,严重者甚至出现整体失稳,形成滑坡。本文以一种上软下硬型库水边坡为研究范例,对其渗流场进行了模拟。首先通过勘查资料建立了斜坡工程地质模型,在明确了地下水位线的基础上,使用SWEEP/W模块建立了渗流模型,通过施加水头的方式来模拟初始水位,计算了这类型斜坡的渗流场,研究成果显示:对上软下硬型边坡而言,若地下水水位线在基岩层内,则斜坡整体失稳的可能性不大,渗流方向沿斜坡中后部启动,至河谷剪出,河谷右岸存在塌岸风险,在进行水利工程建设时应充分考虑这类斜坡的特点。希望通过这次研究,为相关人员提供有效的借鉴和参考。

Reservoir slopes often deform due to changes in the seepage field.In severe cases,they may even lose stability and form landslides.In this paper,a kind of upper soft and lower hard reservoir slope is taken as a research example to simulate its seepage field.First,the slope engineering geological model was established through survey data.On the basis of clarifying the groundwater level,the SWEEP/W module was used to establish a seepage model.The initial water level was simulated by imposing a water head,and the seepage field of this type of slope was calculated.The research results show that for the upper lower and hard soft slopes,if the groundwater level is in the bedrock layer,the overall slope instability is unlikely,and the seepage direction starts along the middle and rear part of the slope and cuts out to the valley.There is a risk of bank collapse on the right bank,and the characteristics of this type of slope should be fully considered when constructing water conservancy projects.