Пальові фундаменти висотних будівель в складних грунтових умовах
Problem definition.When building the foundations of high-rise building should take into account a number of factors that affect the stress-strain state of the base. The important role played by non- uniform deposition of soils with special characteristics whose presence affects the choice of the lengthof the piles in the foundation.Purpose:Explore the work of pile foundation high-rise building in difficult soil conditions in thepresence of inclined soil layers with specific characteristics and installed a rational length of piles inthe foundation on an example of a real residential building.Analysis of recent research:In the work of many scientists reveals the problem of the influence ofsoil layering basics to choose the length of the pile in the foundation of high-rise buildings. Preferably, in publications sounds that soils with special characteristics must cut piles for reliable operationfoundations of high-rise buildings.Results:For the comparison of variants selected foundations of foundation piles 12 m long whenthe sole piles is above the soil layer with special characteristics; and length of 18 m, when the sole piles located in this soil layer and partially cuts through it.In both cases the value of settlement foundation plate larger in relation to regulatory requirements.In addition, the second version of the character settling foundation slab changed - maximum settling concentrated in the area where the pile is not cut through a layer of weak bases.This has skewed foundation slab, going beyond acceptable values.Therefore a new design of pile foundation piles must perform different lengths: the main piles under the building length of 20 m, in an area of weak layer length of 24 m for its cutting in corner areas - 15 m in order to reduce their effort.The final version of foundation settling decreased to 7,5 cm and are within the standards values bending moments in the foundation slab were small and uniform.Conclusion.Established that the arrangement of foundations in difficult ground conditions with piles of different lengths allows to achieve a uniform redistribution efforts in foundation construction and settling of foundation slab reduced to 2 times.