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。
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。
In this paper, the assumption of equivalent stress method only used near the dam heel and toe and the middle regions stress USES the FEM calculated stress.
针对该问题，提出局部等效应力方法，即对坝基面坝踵和坝趾局部区域进行局部等效处理，坝基面中间大部分区域仍采用有限元计算。
Main contents and results are as follows:(1)To evaluate dam toe line is of vital importance in dam computer auxiliary design, however, its evaluation traditionally adopts graphic solution.
求解堤坝坡 脚线是堤坝计算机辅助设计中一个十分重要的工程问题，而这一问题的求解一直采用传统的图解法。
Main contents and results are as follows:(1)To evaluate dam toe line is of vital importance in dam computer auxiliary design, however, its evaluation traditionally adopts graphic solution.
求解堤坝坡 脚线是堤坝计算机辅助设计中一个十分重要的工程问题，而这一问题的求解一直采用传统的图解法。
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