Experimental investigation on static and dynamic characteristics of granulated rubber-sand mixtures as a new railway subgrade filler

Because of their low unit weight, strong linear elastic deformation ability, good durability and high energy dissipation, mixtures waste tire rubber sand have been increasingly used as a new type subgrade filler in railway engineering. To investigate static dynamic characteristics granulated rubber-sand filler, consolidated undrained monotonic cyclic triaxial tests were carried out. The reveal that the shear strength first increases then decreases with increasing content is maximized when approximately 10%. Based on theory an equivalent intergranular void ratio, equation for estimating peak deviatoric stress proposed. addition can constrain generation accumulation pore water pressure improve liquefaction resistance mixtures. change modulus inversely proportional to frequency, directly confining pressure. A also established calculating maximum considering effect ratio By comparing other it concluded less than 20% meet engineering requirements related stiffness. damping correlated content, negatively insensitive loading frequency. relationship between strain conforms proposed by Hardin Drnevich. analysis different optimum should be