Buckling load of an infinitely long cylindrical shell interacting with the soil environment

The article considers the problems of numerical computational stability analysis for an infinitely long cylindrical shell interacting with the soil environment. Several spatial computational models of "the shell – the soil" system have been compiled to determine the buckling load and the buckling mode. The interaction of the shell and the soil environment is provided by contact pairs located on the respective surfaces. Contact pairs with a rigid connection between bodies and contact pairs with the detachment possibility of interacting bodies are used. Contact pairs with and without the friction coefficient are also used. The problem is solved in linear and nonlinear statement. The materials of the shell and the soil environment are given by elastic-plastic models of Mohr-Coulomb and Drucker-Prager. The buckling loads are defined relative to the effective gravity load. The buckling loads and the buckling modes of the cylindrical shell are obtained as a result of numerical computational stability analysis. The comparative analysis of the received buckling loads is presented and the corresponding conclusions are given. (paper)