Malyshev O. Bearing capacity of a base of T-cross section piles

The object of study - interaction of driven (jacked) friction T-cross section pile with a sandy and clay ground base. Purpose of the study - bearing capacity and stress-strain state ground base of friction T-cross section piles at action of static compressing vertical loading. Purpose - to define a method of calculation T-cross section piles for the І and the ІІ group of limiting conditions at action of vertical loadings, and comparison of the received results with the corresponding data of natural tests. Methods: experimental laboratory and natural tests of single models of piles-stamps and piles in natural conditions by static vertical compressive load, statistical mathematical methods processing the results of tests, development of calculating method of bearing capacity of driven and jacked T-cross section piles, comparison the results of calculations of piles behind the developed method with the data of natural tests. Novelty - investigated interaction of a lateral surface T-cross section pile with a sandy and clay ground base; revealed distribution of efforts which are transferred to the ground base separately by bottom end, a lateral surface and at their combined work by a T-cross section pile; proved influence the form of T-cross section pile on its bearing capacity; received the data on character of deformation zones and condensation of a ground around a lateral surface T-cross section piles; confirmed presence the condensed zones of the ground located between a shelf and an edge of T-cross section which positively influence on its bearing capacity; developed method of calculating T-cross section piles for the first and the second group of limiting conditions in view of features of its work which allows to construct the graphic function S=f (P). Industry - construction.