Seepage free surface issue exists in analysis of the seepage concerning geotechnical slope, earth dam, underground cave and groundwater movement.

在岩土边坡、土坝、地下洞室及地下水运动等渗流分析中，均存在有渗流自由面问题。

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In design of homogeneous earth dam, sudden drawdown of water level is always a control condition for stability of upstream slope.

在均质土坝设计中，水位骤降通常是上游边坡稳定计算时需控制的工况。

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According to the safe slope ratio of earth-filled core wall and the seepage calculation of earth dam, a simple method to calculate the core wall thickness of earth dam is given.

文章从心墙填筑填土料的安全渗透比降为基础，结合土坝的渗流计算，得出土坝心墙厚度的简便计算方法。

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