DETERMINATION OF THE DIMENSIONS OF THE COMPACTED ZONE OF THE NEAR-PILE SOIL DURING PIT STAMPING

Abstract

The paper presents research results on the development of a method for predicting the dimensions of the compacted soil zone forming around a single pile when a pit for a local grillage is stamped after the pile has been driven. This method was developed for a new type of single-pile combined foundation that integrates the functions of a driven pile and a foundation in a stamped-out pit. The relevance of this research stems from the lack of existing solutions regarding pit stamping conditions within the peripile soil. The objective of the study is to derive fundamental formulas for determining the dimensions of the compacted soil zone during the pit stamping process. These solutions are based on the mass conservation equation for the peripile soil within the compacted zone before and after the pit is stamped.

The study utilizes established calculations and techniques from mathematics, physics, and soil mechanics. Two variations of possible compacted zone configurations are considered. Analytical formulas were obtained that allow for the determination of the diameter and depth of the compacted zone (below the bottom of the pit), taking into account the density and moisture content of the peripile soil, as well as the dimensions of the driven pile and the pit stamped over the pile head. Comparative calculations performed using these formulas showed that the results are closely aligned, with the difference not exceeding 20%. The fundamental formulas include parameters for which recommendations must be developed based on experimental research. The method is recommended for use in engineering practice following experimental verification.