الفهرس 
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Abstract
INTRODUCTION: Collapsible soils are known to experience a significant sudden volume reduction due to an increase in soil moisture content, regardless of the change in the in-situ stress level. Since the collapsible structure of soil contains low moisture content naturally formed, such soils are considered as unsaturated problematic soils. Human activities nowadays continue to increase in these types of collapsible soils that exist in many countries around the world. So geotechnical engineers need to learn how to deal with these problematic soils. Reliable correlations between basic soil properties would be valuable to reduce the need of performing collapse tests either in the laboratory or in-situ. The problem of a laterally loaded single pile/shaft has been the subject of investigation and research for more than three decades. Current study is concerned with modifying the strain wedge model technique using some developed soil relationships, integrated into the analysis of the problem of laterally loaded piles embedded into collapsible soils. OBJECTIVES OF STUDY: The main research objective is the development of a number of correlations between collapsible soil properties due to the change in degree of saturation. Such correlations are employed in the assessment of laterally loaded pile response embedded into collapsible soil as a result of full saturation. STUDY PROCEDURES: Present study focuses on collapsible soil of sandy type. Data for soil samples is collected from different reports and search work. Representative correlations were obtained from collected data and integrated in Strain Wedge Method software package (SWM V6.2) which is used to study the response of laterally loaded (long, intermediate and short) piles embedded into collapsible soils before and after full saturation. CONCLUSIONS: The study results display the variation in soil strength properties over initial and full degree of saturation of collapsible soils based on the value of the collapse potential. The change in void ratio before and after full saturation can be related to the value of collapse potential. For different values of uniformity coefficient (Cu) and void ratio (e), values of (ε50) are not affected before and after full saturation if the initial degree of saturation is more than 50%. The Strain Wedge Model Computer Program has been modified using proposed relations which are applied to the analysis of laterally loaded piles embedded into collapsible soil with different initial degrees of saturation prior to full saturation.