الفهرس | Only 14 pages are availabe for public view |
Abstract The swelling phenomenon of expansive soils is considered as one of the most serious problems which face the foundation engineers. Several techniques were used to reduce the detrimental effects of this type of soil. In the present work, the sand piles effect on an isolated footing resting on expansive soil was investigated using model tests. Two different expansive soils were used; the first having moderate swelling properties and the second having very high swelling potential. Twelve tests were performed using several footing models under an applied constant stress of 2 kg/cm. The various factors which affect the behaviour of an expansive specimen containing sand pi les have been investigated: sand pi les I diameter, their number, volume of single sand pile, the footing diameter and sand pile depth. It was found that using sand piles is a suitable treatment to reduce the maximum swelling in case of expansive soi 1 with moderate swell ing properties. On the other hand for clay with very high swelling potential this technique may have some limitations. The results of the thesis provide some practical consideration regarding the implementations of sand piles as a treatment method for swelling soils. |