Document Type : Research Article
Msc Student, Geotechnic Engineer, University of Qom
Faculty member, Engineering Geology, Tehran University
One of the mechanical methods of soil stabilization is the use of reinforcing elements such as geotextiles, geogrids and natural or artificial fibers. In recent years, the use of disconnected artificial or natural fibers has become commonplace with random distribution to improve the mechanical properties of soil. A new type of fiber that has a natural origin and its production and application has the least environmental impact is basalt fiber. The prominent advantages of this type of fiber are the high resistance in acidic, alkaline and saline environments, and mechanical properties that are competitive with other fibers. In this study, in addition to identification tests, a series of modified compression test, uniaxial compressive strength test and indirect tensile strength test and SEM electron microscopy was tested on clay stabilized with basalt fiber with random distribution. The focus of this research was mainly on the effect of fiber length and weight percentage on soil resistance parameters. For this purpose, basalt fibers were mixed with soil in weight percentages of 0.25, 0.5, 0.75, 1, 1.5, 2 and with three different lengths of 6, 12, 25 mm, then compressed with optimum moisture content. The results show that by increasing the weight percent and length of the fibers, compressive strength and tensile strength, initially increases and then decreases. But in general, the compressive strength and tensile strength of the reinforced soil is more than unreinforced and in all cases, reinforced samples are more ductile than unreinforced specimens.