ABSTRACT
Prediction and simulation of construction parameters of large shells in heterogeneous soil milieu provided considerable expansion of the area of rational use of underground areas of megacities for deep transport facilities and engineering infrastructure. Mega sizes of an RC shell allow creating open underground areas, unique in volumes and deepness. The analysis of behavior of a massive gravitational fencing shell at its gradual increasing and driving into heterogeneous soil milieu allowed identifying the nature of their non-linear and unsteady behavior. Unsteadiness of the processes of interaction of a massive structure and soil milieu causes the necessity to create methods for adaptive control of strain-stress behavior of the “gravitational large body—heterogeneous host medium” system for decreasing aggravating influence of the effect of unsteadiness on the lowering process. Due to joint step-by-step implementation of geotechnical and structural calculations a history of the processes of shell-soil milieu interaction is modeled and the parameters of adaptive control of strain-stress behavior are predicted, thus providing conditions of controlled lowering. The paper demonstrates results of implementation of the given concept during design and construction of unique underground structures of the sewage system of St. Petersburg.
