混凝土面板堆石坝垂直缝止水劣化过程量水堰监测分析

为研究混凝土面板堆石坝垂直缝接缝止水劣化引起的渗漏量和渗透坡降的变化规律,以某面板堆石坝为例,采用有限元计算方法,模拟了面板左岸垂直缝、面板中间垂直缝、面板中间垂直缝不同高程分别发生止水劣化过程中的渗流,计算了不同工况下通过面板渗漏量、量水堰渗漏量测值、浸润面分布,分析渗透坡降和量水堰测值的关系。计算结果表明,量水堰测值能够反映出面板垂直缝止水劣化程度及垫层区渗透坡降是否超出允许值;随面板止水劣化,面板中间垂直缝较面板左岸垂直缝引起的渗漏量更大、浸润线上升更为明显;面板中间垂直缝随高程降低,引起的渗漏量增加、浸润线上升更为明显。

Measuring weir monitoring analysis of water sealing deterioration process in vertical joints of a concrete faced rockfill dam

To study the variation law of the leakage and seepage drop due to the deterioration of water sealing in the vertical joints, a concrete face rockfill dam(CRFD)was taken as an example to simulate the seepage in the vertical joints on the left bank of the face slab, the vertical joints in the middle of the face slab, and the middle sag of the face slab under different elevations in the process of water sealing deterioration based on finite element method. The leakage through the face slab, the leakage measurement value of the measuring weir and the distribution of the seepage surface were calculated and the relationship between seepage gradient and the measured value of the measuring weir behind the dam was analyzed. The calculation results show that the measured value of the weir can reflect the deterioration degree of the water sealing in the vertical joints of face slabs and it can also estimate whether the seepage slope in the cushion zone exceeds the allowable value. With the deterioration of the water sealing, the leakage caused by the vertical joint in the middle of the panel increases, and the rise of the seepage line is more evident than that of the left bank. In addition, with the decrease of elevation, the leakage caused by the vertical joint in the middle of the panel increases, and the rise of the seepage line is also obvious.