ІRSTІ 67.17.15                                                                                              №4 (2018г.)

Bekbasarov I.I.

To assess the effect of the shape of the lower end of the piles, laboratory studies were carried out using models of piles without a point, with a rounded bottom, with a pyramidal point, and also with a wedge-shaped point at different taper angles. The first series of experiments provided for driving models with the same number of strokes, and the second series – driving the models to the same depth. To evaluate the bearing capacity of models, the method of dynamic tests is used. It is established that the shape of the lower end and the angle of sharpening of the models affect their depth of immersion, energy-punching and bearing capacity. On the basis of the test results, the dependences obtained allowing one to take into account the influence of the shape of the tip and the angle of sharpening of the piles on their specific energy capacity of piling and bearing capacity. Formulas are recommended to use when selecting piles at the design stage of pile foundations for buildings and structures. In domestic and foreign geotechnical practice, the influence of the shape of the lower end of the piles on their parameters is not taken into account.
Keywords: pile, model, tip, ground, tray, impact, depth of immersion, specific energy intensity, bearing capacity.