New relationships of shapes, sizes and properties formation for soils of the “influence area” of foundations and artificial bases, arranged without excavation, have been determined. The “influence area” parameters are decisive in assessing the stress-strain state of the system “base – foundation”. Field and laboratory methods of soil properties research of the “influence area” were improved: penetration; probing; rotational slip. A method of constructing the compaction area boundaries is considered, taking into account the shape, dimensions of the foundation cross-section and longitudinal profile, the type and properties of the base soil. For the first time, it is established that for soils with an angle of internal friction φ < 25°, the boundaries of the compaction area and the “influence area” are close to each other. When φ > 25° the boundaries of the “influence area” exceed the boundaries of the compaction area as more, the more the angle of internal friction of the soil. The relationship between the volume of the leading well and the soil compaction area diameter was also determined.
The method of bearing capacity calculation of the inter-column slabs of flat slab frame system is developed by a kinematic way based on the ultimate equilibrium method. The basis of the study is the kinematic method of the limit equilibrium method and its application to calculate the load-bearing capacity of the inter-column slab in flat slab structural system, as well as to select the area of the working reinforcement. Attention is also paid to establishing the location of the lines of plastic hinges formation.
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