The singularity of hydraulic gradient, which is always found in the calculation of seepage at the toe of dam, is not accord with the reality and makes the trouble in judging the safety of the dam.

根据现行计算方法，堤坝下游坡脚处渗流水力坡降具有奇异性，这给工程设计中判别渗透安全性带来困难，同时与实际情况也不符合。

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High arch dam toe area is the focus of reinforcement design.

高拱坝坝趾区域是加固设计的重点关注区域。

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The results show that the failure of dam foundation is caused mainly by the extension of dam heel crack and the expansion of shear-yield zone of the foundation rock near the dam toe.

结果表明，坝基的破坏主要表现为坝踵裂缝的延伸和坝趾附近基岩剪切屈服区的扩展。

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