Improving the Creep Properties of Modified Clay with Nanosilica and Polypropylene Fibers (Case Study: Shahid Shahcheraghi Dam Central Borrow Pits)

Long-time Settlements or creep means the gradual increase in deformation of the soil over time, which is subjected to a constant load. The phenomenon of creep is very important in geotechnics and it is carefully investigated in cases where time and factors affecting it are involved, because when settlement occurs in the structure, many problems such as creating cracks, increase in deformation and stress are created, which , reduces the efficiency, utilization and useful life of the structure. Modifying the behavior of soil by using different additives is one of the important issues for the progress of researchers in civil engineering. Common additives such as lime, cement, bitumen, fly ash, wood ash, copper slag, iron slag, etc. have been investigated in previous studies, and nano and polymer materials, whose use in other branches of engineering science has led to fundamental changes and have unique characteristics, have been more interested in geotechnical engineering in recent years.