Driving Features of Tapered-Prismatic Piles and Their Resistance to Static Loads

prismatic piles for driving static vertical and horizontal loads are
presented. Field tests were carried out on sandy loam on piles models
(M 1:3) with different lengths and cross-sections of the pyramidal
segment. It has been established that the driving of tapered-prismatic
piles is accompanied by both large (by 1.10-1.60 times) and lower
(by 8.0-37.0%) energy consumption for their driving in comparison
with conventional prismatic and pyramidal piles. It was also revealed
that under the vertical pressing load, the bearing capacity of the
tapered-prismatic piles is 1.09-1.48 times, and under the horizontal
static load, it is 1.17-1.80 times higher than the prismatic pile. It has
been established that with an increase in the length of the pyramidal
part of the experimental piles, there is an increase in their bearing
capacity by 1.12-1.34 times. Equations are proposed for determining
the bearing capacity of tapered-prismatic piles. The research results
serve as the basis for the development of recommendations for the
calculation and design of tapered-prismatic piles. The revealed
features of the behaviour of tapered-prismatic piles allow to
reasonably assign the length and dimensions of the cross-section of
their pyramidal segment.