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提出了一种渗流分析的固定网格法──虚单元法，该法通过迭代可较准确地求出自由面边界，计算区域逐步逼近实际渗流区域，可应用于稳定和非稳定渗流计算。
A fixed grid method of seepage analysis ─ ─ virtual element method is proposed. The boundary of the free surface can be calculated accurately by iteration. The calculated area gradually approximates the actual seepage area and can be applied to the steady and unsteady seepage calculation.