Experimental study on dynamic parameters of red mud loess complex

Sample red mud, loess and red mud loess composite samples were tested by GDS dynamic triaxial apparatus to study some dynamic parameters of red mud, loess and red mud loess composite samples, and analyze the impact of red mud content and confining pressure, aiming to explore the engineering properties of red mud loess composite material for roadbed. The results show that the red mud, red mud loess composite sample curves of stress-strain σd-εd, strain-dynamic elastic modulus Ed-εd, strain-damping ratio λ-εd have similar characteristic variation with loess, but difference in value. The incorporation of red mud enhances the composite sample strength and stiffness, and is proportional to the incorporation of m. And with the increasing incorporation of red mud, dynamic elastic modulus Ed and maximum dynamic modulus Edmax significantly increase, but increased degrees are different in different confining pressures. The corresponding damping ratio λ of composite sample decreases with the increase of the red mud content, but with the increase of the confining pressure, the impact on the red mud content is smaller. The impact of confining pressure on dynamic parameters: in the same strain, the stress σd increases with increase of the confining pressure, the dynamic elastic modulus Ed increases with increase of the confining pressure, the damping ratio λ increases with increase of the confining pressure in previous period, but it decreases with increase of the confining pressure in the latter. Thus, the best ratio of red mud loess composite sample of red mud: loess is 3:7. © 2016, Editorial Department of Journal of Southeast University. All right reserved.