EXPERIMENTAL STUDIES ON SINGLE STONE COLUMNS WITH TIRE DERIVED AGGREGATE (TDA)

Abstract

Given the increasing land prices, the need for construction development on unsuitable lands (from a geotechnical perspective), environmental restrictions on the use of quality lands, etc., there is an ever-increasing need for the development of new methods for improving substandard lands. Choosing the right method for improvement in a specific site is of utmost importance. Depending on the project conditions, including the location of implementation, adjacent structures, available technologies, and the project's economy, one can benefit from one of the soil improvement methods. One of the applications of deep foundations is when the soil at shallow depths does not have sufficient bearing capacity, and the loads must be transferred to the harder layers below. Stone columns can be referred to as an ideal option for improving loose layered soils, clays, and loose silty sands. Considering the implementation conditions, the stone column method is more known as an empirical method and requires more extensive research to predict the ultimate strength of the soil reinforced by this method. Factors such as column length, column diameter, gradation of column materials, protective coating on the column, and the arrangement of columns when employing a group of columns should be considered, and different results can be obtained by changing any of these factors. Therefore, the need for further research in this field is felt. This document focuses on the study and modeling of stone columns covered with a protective layer, featuring gravel mattress on the columns, as well as the utilization of tire derived aggregate (TDA). The study has explored the impact of reinforcement on the load bearing capacity of footings by examining encased stone columns. It is hoped that through acquiring the necessary expertise in this field and conducting extensive research, new solutions or at least ones that complement previous studies in this area can be provided.