Shi Hong-yan, Liu Shan-shan. Finite Element Programming for the Superposed Element Used to Analyze Consolidation of Soil[J]. 2014, 31(4): 115-120.DOI: 10.3969/j.issn.1007-7162.2014.04.022.
To meet the different order needs of displacement and pore-pressure shape functions in consolidation problem analysis
it used the superposed element
formed by superposing two elements with the same geometry but different nodal numbers and nodal degree of freedom numbers. Based on the careful comparison of the difference between the superposed element and the ordinary element
the programming method and some SUBROUTINEs designed by FORTRAN77 were given for the superposed element. The feasibility of the method has been proved by giving two examples.