], in which the stiffness K z of the ground was modelled in such a way as to obtain more and more vertical dents u z of the bottom plates with a full tank. The whole tank was made of steel with yield strength f y = 235 N/mm 2 . The numerical model was created from bar elements and shell elements. The tank structure has been mapped with 4 nodal shell elements, while maintaining alignment with the central surface of the coating. The density of finite elements (FEA) was determined on the basis of the so-called solution convergence analysis, and as a criterion, it
 BRANDL H., Vertical barriers for municipal and hazardous waste containment , Proceedings Symposium on Developments in geotechnical Engineering, Bangkok, 1994, 301-334.
 KODA E., STĘPIEŃ M., Application of Vertical Bentonite Barriers Surrounding Sanitary Landfills , 4th International Waste Forum „Systems of Waste Management”, Poznań-Piła, 2001, 1-12.
 VERRUIJT A., KODA E., Analysis of Pollution Control by Finite Elements , Water Science and Technology Library (Vol. 12