Based on the method of adjusting the conductivity matrix, the composite element method is proposed to deal with the elements intersected by free surface in the analysis of unconfined seepage problems.

• 针对无压渗流问题,在传导矩阵调整法的基础上,对穿越自由面的单元用复合单元来处理,每个复合单元具有两套结点水头,一套用于饱和区的水头插值;另一套则用于无水区。