It should be borne in mind that the latter circumstance leads to a shift in the center of gravity of the building and an additional non-linear increase in torque loads on the foundation that is even more enhancement of deformation bases. Third geotechnical feature high-rise buildings is substantially higher than for conventional buildings, the amount of development zones precipitate out patches of the building. This feature together with increased values of stresses in soil mass can lead, in particular, to the fact that the precipitation of high-rise buildings are stabilized relatively slowly and reach the final values for the longer intervals time than for conventional buildings. Increasing the size of the zone of influence should also be taken into consideration when designing structures adjacent to tall buildings, and in the development of measures to protect surrounding buildings. As in the general case, the design of foundations, basements and underground parts of tall buildings based on the fundamental engineering concepts of limit states, soil base and material foundation structural strength, bearing capacity and deformations.
However, you must enter a significant change in the procedure for determining the allowable values in the calculation of the second group of limit states for soil foundation. Based on years of experience in precipitation observations constructed and properly operated buildings were assigned values of limiting strain and rolls for a wide range of conventional buildings and structures (Snip 02/02/2001 2, snip 02.02.2003 3, mgsn 7.2 19, etc.). These empirical values can not be directly used for calculations of high-rise buildings. On the other hand, for the direct purpose similar to the corresponding values for calculation bases of tall buildings for the second group of limiting states of available observational data is currently impossible due to lack of observational data and individual characteristics of the designed objects. Degree of responsibility the choice of design solutions for zero-cycle construction of tall buildings is higher than for conventional structures, also because the patch is approved in the design of geotechnical errors in the construction process for such buildings is considerably more complicated and more expensive than ordinary buildings, and in particularly difficult conditions such corrections may not be possible.