Pre-stabilization of soft soils using high-modulus columns prior to bored pile construction: an innovative approach

Abstract

The construction site of a silo, which was built as two sites, consists of very soft alluvial soils. Since the superstructure loads exceeded the bearing capacity of the shallow foundation, the structure was built on a deep foundation with bored piles. Due to the very soft soils, some difficulties were encountered during the bored pile construction at site-1. As a result of the difficulties encountered, Jetgrout columns were constructed around the bored piles in site-2 and then the bored piles were constructed. Loading tests were performed on the bored piles at both sites and their bearing capacity performance was evaluated. The study comparatively describes the bored pile construction before and after soil improvement in very soft soils, the difficulties encountered during the construction phase, the solutions to the difficulties, and the bearing capacity performance of the piles. At the same time, in this article, it is explained in detail with field observations that bored piles installed in partial composite soil improved with jetgrout columns are faster and more economical. This study is a field study that aims to contribute to the literature by evaluating the geological, geophysical and geotechnical evaluation of such industrial structures constructed with large-scale budgets from an academic point of view.