Study of geotechnical properties of silty loess soil stabilized with lime and glass fiber

In this study, lime and glass fibers were used to improve the silty loess soil. To achieve this, the silty loess soil was sampled from a region of Golestan province and transferred to the Soil Mechanics Laboratory of the Shams University of Gonbad-e-Kavos. Then, in order to compare soil stabilization and reinforcement, the effect of lime and glass fiber each individually and simultaneously on geotechnical characteristics of silty loess soil has been investigated. The percentages of mixing for lime is (0%, 4% and 8% of dry weight of soil) and glass fiber (0%, 0.3%, 0.6%, 0.9%, 1.2%, 1.5% and 2% of dry weight of soil). The effect of mixing rate and different curing periods on the compaction behavior, compressive strength and shear strength of the samples have been investigated. The results of unconfined compressive strength tests showed that adding glass fiber to lime stabilized soil significantly increases the compressive strength of the samples and increases the strain of the rupture and also reduces the width of the cracks. In the direct shear test, it was observed that mixing the soil with lime and glass fibers increases the shear strength, increases displacement at failure, increases the friction angle of the soil and increases cohesion. Unconfined compression strength and direct shear tests showed that there is a fiber percentage that by increasing the fiber percentage from that, the strength decreases. This amount of fiber was obtained in most tests between 0.9 to 1.2% fibers.