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Calculation of Bases for Rigid Complex-Shaped Deepened Foundations According to the Second Limiting State in a Three-Dimensional Formulation

2009; Springer Nature; Linguagem: Inglês

10.1007/b11479_5

1860-6237

Sergey M. Aleynikov†,

Geotechnical and Geomechanical Engineering

In the fifth chapter boundary-element method is applied to calculate contact interaction of foundation structures with soil, taking into account the deepening factor. The need for spatially based calculation of bases of deepened foundations is explained. The principles for foundation structure calculations from the base deformations are briefly reviewed as well as the existing problem formulations and solution methods for spatial problems of contact interaction of deepened foundation structures with soil bases. Solutions of spatial contact problems for deepened monolithic-type foundation structures most widely used in the recent years are also considered, namely for (1) pyramidal piles; (2) foundations made of short vertical or inclined bored piles with caps; (3) bored pile foundations with support extensions; (4) slot foundations with the longitudinal cross-section of various shape. Heterogeneous stress-strained states of the base are taken into account as well as the formation of cavities between the soil and the foundation structures. The effect of the foundation shape on its displacement and slope at various spatial loading is estimated quantitatively. Numerous examples show the results of the boundary-element modeling to be in good agreement with the experimental measurements performed for spatial foundation structures, in most cases boundary-element method results being closer to the experiment than those obtained by other known calculation methods.