Low-pressure injection piles are increasingly used both while reinforcing old foundations and designing new engineering solutions. In the course of design works, piles are often linked functionally with foundations. The research presented in this study does not confirm the guidelines according to which the coefficients reducing the bearing capacity of piles used as part of a set of piles should be applied. The area around a pile, which is affected by significant ground deformation, is very limited. According to the performed experiments, piles bear different in fluence on cohesive and non-cohesive soils. In both cases, a noticeable difference of pile and ground dislocation within their contact zone has occurred. It therefore seems necessary to verify the operating model of a pile in the ground, considering the slipping of both means in relation to each other.
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The results of relocation measurements carried out for injection piles under axial load in wide range of loads, considerably exceeding their normative carrying capacity, indicate that employed computational models do not represent actual deformation process in an appropriate way. Taking into account slide at the contact between pile side surface and soil makes it possible to approximate theoretical model behaviour to actual soil reaction. Moreover, the proposed model gives an opportunity to characterise many effects resulting from susceptible combination of two different materials - cement grout and soil. In particular when we abandon the assumption made in this work of the interaction between soil and pile deformation.
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