الفهرس 
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Abstract
Soil stabilization is required when the soil available for construction is not suitable for the particular use. Collapsible soils are causing significant problems to the civil engineering structures. Such soils have large volume changes upon adding the water. Based on the material’s origin and use in practice, several methods have been used and performed to control the problems of soils. The modification of soil properties may be done in several ways, as summarized: 1. Mechanical method (compaction): This is usually the cheapest method of improving site soil. 2. Precompression method: This method is primarily employed to reduce future settlement, but may also be used to increase strength. 3. Densification using vibratory equipment: This is particularly used in sand, silty sand and gravelly sand deposits. 4. Foundation grouting: Grouting is a technique of inserting some kinds of stabilizing agents into the soil mass under pressure. 5. Soil reinforcement by using geotextiles. 6. Soil stabilization by admixtures: Admixtures are occasionally used to stabilize soils in the field particularly fine grained soils. The most common of these admixtures are cement lime, fly ash, and asphalt. In this study, waste marble dust, which is the product of marble industry, is used for stabilization the collapsing soil. No work addresses marble dust as a stabilizer for collapsibility behavior. So this research target is directed to propose a new solution for improving collapsible soils by using marble dust. Marble factories produce millions of tons every year of marble dust, which cause pollution to the environment and health problems to humans. Furthermore, to get rid of marble dust, it is added to the collapsed soil with different particle sizes and percentages to study its properties.