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为探讨某高混凝土面板堆石坝在强震等作用下竖缝止水失效时坝前粘土铺盖的防渗作用问题,采用饱和—非饱和渗流有限元法构建三维有限元模型,分析了不同竖缝失效后竖缝处渗透流量明显增大,粘土铺盖坡降增大,但均在允许范围之内,粘土铺盖在止水失效时起到了一定的防渗作用;随着粘土铺盖渗透系数的增大,粘土铺盖阻渗能力减弱,坝体浸润线逐渐升高至失效竖缝的顶端,浸润线抬升速度逐渐变缓,粘土铺盖渗透系数对整个坝体的防渗体系起到重要作用;在坝高100m对应高程以下竖缝全长全失效情况下,若坝体浸润线高程渗透流量满足渗透稳定要求,就不必做防渗修补工作,面板坝仍能正常运行。
In order to investigate the seepage control effect of the pre-dam clay cover when a concrete faced rockfill dam is damaged by strong seismics such as strong earthquake, the three-dimensional finite element model of saturated-unsaturated seepage finite element method is constructed, After the failure, the percolation flow rate in the vertical seam increased obviously, but the slope of the clay cover increased, but it was within the allowable range. The clay cover had a certain seepage prevention effect when the water stop failure. With the increase of the permeability coefficient of the clay cover Large, clay cover barrier capacity weakened, the dam infiltration line gradually rose to the top of the failure of the vertical seam, saturation line slowing down the rate of rise, clay cover the permeability coefficient of the dam system plays an important role in anti-seepage; dam Under the condition that the height of 100m high corresponds to the total failure of the vertical joints below the elevation, if the seepage flow at the dam infiltration line elevation meets the requirement of seepage stability, it is not necessary to do seepage proofing work, and the dam can still operate normally.