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针对渗透水流对土石坝坝体、坝基的渗透破坏危害性极大问题,以金佛山水电站混凝土面板堆石坝为例,根据地质条件和渗流控制特点建立平面二维有限元计算模型,模拟了坝体在不同水位组合条件下的渗流场,研究了渗透破坏的可能性,并分析了防渗帷幕及坝基渗透系数的敏感性。计算结果表明,各种水位组合下混凝土面板及防渗帷幕起主要阻水作用,水力比降大,渗流场分布对防渗帷幕及坝基渗透系数不敏感,渗流流量相对敏感,为坝坡安全性和渗流稳定性评估提供了依据。
In view of the great harm of seepage flow to the infiltration and destruction of earth-rock dam body and dam foundation, taking the concrete face rockfill dam of Jinfooshan Hydropower Station as an example, a two-dimensional finite element model of plane is established according to geological conditions and seepage control features to simulate the dam The seepage field under different water level combinations is studied. The possibility of seepage failure is studied. The permeability of impervious curtain and dam foundation is also analyzed. The calculation results show that the concrete panels and anti-seepage curtains under various water level combinations play a major role in blocking water and decreasing the hydraulic ratio. The seepage field distribution is insensitive to the seepage curtain and dam foundation permeability, and the seepage flow rate is relatively sensitive. And provide a basis for the assessment of seepage stability.