Numerical Analysis of Treatment of Highly Expansive Soil by Partial Replacement with Crushed Concrete

Abstract

The major goal of this research work is to treat one type of the known problematic soil (expansive soil) by partial replacement with crushed concrete material which is found in large quantities and distributed on large area of Mosul city. Numerical analysis using Geo-Studio program 2007 is utilized to analyze this problem. Several parameters are considered in this study such as; thickness of the crushed concrete layer of (20, 30, 40, 50, 60, and 70) cm, width of crushed concrete layer is equal to width of footing B, 1.5B and 2B, soil with low and high suction and the time required to complete swelling are studied. All the mentioned parameters were studied with and without presence of footing. The main results of the analysis showed decreasing in vertical swelling upon increasing the thickness and width of the crushed concrete layers. The use of crushed concrete layers is more active in lowering the vertical swelling of high suction soil than that of low suction soil. Finally, the increase in thickness of the crushed concrete layers reduces the increase in vertical swelling with time.