Tray investigation of tangential stress along the pile, which isn’t previously connected with a fragment of raft

Abstract

Annotation. Purpose. Laboratory research of the stress-strain state of base fragment of pile foundation with individual, or sequential loading of its elements, to obtain a qualitative picture of the process’ influence of the alternate involvement the pile foundations’ elements to work on the forces’ behavior of additional tangential stress and friction along the lateral surface of the pile. Methodology. Two series of tests were carried out: first series - the plate connected with the pile was loaded (it imitates the work of the classical pile foundation fragment, which deformation of the base will be taken as 100%). During the 2nd and 3rd series, the elements of the pile foundation fragment were gradually applied to the work (loaded plate, not connected with the pile, and subsequently the plate and the pile were interconnected), but during the third series, additionally, the pile was loaded in the absence of the connection to the stove. Results. During the 1-st stage of the second and third series of tests deformation of the soil under the plate, that caused the displacement of the pile (unconnected with the piece of plate), was recorded. Originality. Laboratory recorded the occurrence of additional tangential stresses around the pile, unconnected with the piece of plate under loading plate, to the depth of 1,2...1,8 of the width of the piece of plate. Practical value. The model of the pile foundations’ fragment, the elements of which are involved to the work of the rotate, is capable of perceiving and withstand greater loads in comparison with the simultaneous loading of the piles’ foundation’s fragment. Sequential mobilization of all components of the pile foundation will help increase their trust level and to utilize the maximum potential of the ground bases, which could be an additional factor in the preservation of resources for the construction of pile foundations in general.