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本文为无压稳定渗流条件下土坝渗流计算的研究。对心墙土料渗透系数的变化,直至与坝壳料相等时的情况进行了计算,以便分析过渡带的排水效果。为了便于分析,兹采用一座建于岩基上,高度为63m,心墙下游设有垂直排水过渡带的土坝,以确定其心墙内浸润线的变化为例来说明。该坝址处河床高程为172m,坝基高程为159m;坝顶高程为222m。分析方法通过土坝的稳定渗流可采用有限差分数值法求解拉普拉斯方程,算得在土坝范围内矩形网络上的总水头势。用以划分正交网格和进行数值计算的有限差分
In this paper, the seepage calculation of earth dam under pressureless and steady seepage condition is studied. The change of the permeability coefficient of the core wall material until the same as the dam shell material was calculated in order to analyze the drainage effect of the transition zone. In order to facilitate the analysis, an earth dam built on a rock foundation with a height of 63m and a vertical drainage transition zone downstream of the core wall is used to illustrate the change of the infiltration line in the core wall. The dam bed elevation of 172m, dam foundation elevation of 159m; crest elevation of 222m. Analytical Methods The Laplace equation can be solved by finite difference numerical method for steady seepage through earth dam, which can be calculated as total water head potential on a rectangular network in earth dam. The finite difference used to divide the orthogonal grid and perform numerical calculations