Experimental study results of the strip foundation fragment action underpinned by a drill-injection pile with widening low end

Abstract

Abstract The article presents the results of static load tests of a strip foundation fragment (bearing plate) underpinned by a drill-injection pile, which has a widening low at its lower end. The static load tests were carried out at the experimental site in the city of Tyumen. A drill-injection pile with widening low end is an injector that has a rubber membrane-glass at its lower end. With the help of a hydraulic packer, the solution is injected into the rubber membrane-glass. After the solution has cured, a widening low end of the required volume is formed at the lower end of the injection pipe. To assess the results obtained, static load tests were also carried out both for a strip foundation fragment without underpinned using a drill-injection pile with widening low end, and a separately located drill-injection pile with widening low end. Based on the data obtained during static load tests in the course of the experimental study, graphs of dependencies were formed: the settlement of a strip foundation fragment on the pressure under its base and the settlement of the drill-injection pile with widening low end on the static load. As a result, it was found that the use of a drill-injection pile with widening low end to underpin a strip foundation fragment allows increasing the bearing capacity by an average of 30%.