New designs of bored piles with a tapered shaft shape are proposed. To confirm reduction or absence of the potential impact of additional load (negative) friction forces effectiveness on piles lateral surfaces in structurally unstable soils (fill-up grounds etc.) due to a change in the edge slope angle, laboratory experimental research on models of tapered piles have been conducted; the confirming results have been provided and described in detail in the laboratory experimental research. The impact of the changed slope angle of the edge on the effect of additional load friction forces on the lateral surfaces of experimental piles was demonstrated; the correlation between the change in taper of piles and the decrease in their surface area has been proven.
In modern urban conditions, needs arise for the development of sites, which are geotechnically complex and disadvantageous for construction. The peculiarities of such sites, among other things, include the presence of structurally unstable soils that exhibit subsidence deformations when wet or under dynamic and vibration loads due to a decrease in the strength of structural bonds. In this regard, the development and implementation of rational design solutions are of current interest when designing and constructing foundations in the presence of structurally unstable soils. One such solution is the use of bored piles. When designing piles for structurally unstable soils, the action of loading friction forces should be taken into account; these forces can arise if the subsidence rate of the soil mass around the pile exceeds the subsidence rate of the pile itself. The study of the interaction of a structurally unstable soil mass with piles and the corresponding theoretical justification are necessary to clarify the methods for evaluating loading friction forces. In an experimental study, the effect of reduction of loading friction forces depending on the taper rate of the pile was discovered, and the results of laboratory measurements of loading forces were analyzed using various schemes for modeling subsidence deformations.
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