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Mohamad Ali Maroof, Jafar Bolouri Bazaz,
Volume 8, Issue 4 (3-2015)
Abstract

The collapsible soils are usually known as soils with open structure and weak bonding between particles. The behavior of such soils is similar to very loose soils. These types of soils, when saturated without any changes in loading or subjecting vibratory loads, experiences huge settlements. The present research deals with investigation on collapsible soils located in the North East of Mashhad. The results of laboratory and in situ tests show that collapsible soil in this region was very sensitive to the increasing of moisture content. This means that an increase in soil moisture content, significant excess settlement occurs during a short time. This indicates that the soil in this region suffers from high potential collapsibility. The huge soil settlement will lead to the stability of existing structures to be at risk. It is, therefore, necessary for the collapsible soil in the region to be improved. For soil improvement, many techniques including moisture mitigation and soil replacement or compaction may be employed. Also stabilization of soil with lime, cement or coarse aggregates are practical methods. Which The results of the present research indicate that stabilization of soil lime is the most appropriate method for increasing bearing capacity of soil and reducing structural settlement.

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