Adopting automatic encoding method based on isoparametric mapping, it is possible to dissect given solid automatically into a number of hexahedrons with 20 nodes or pentahedrons with 15 nodes or their combinations.

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The foundation of arch dam usually is layer rock base, and the depths of the layer are small, it is common that several layer rock base contact with one layer element grid. According to the geometry relation and the property of shape function, a new element kind that includes 24 nodes has been proposed to dissect the dam and foundation effectively, whose shape function are independent. In fact the element can be looked as a hexahedron divided into five small hexahedrons. It can be simulate all kind of the condition of the base and the dam.

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The FEM model used 8-node hexahedrons.

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