Influence of the reinforce scheme on dynamic properties of the reinforced loess with dynamic triaxial test

In order to explore influence of the reinforce scheme (position, layers) on dynamic properties (dynamic modulus of elasticity, damping ratio) of reinforced loess, a series of dynamic triaxial were conducted under 4 different confinement pressures and 10 different reinforce schemes. The results show that for both the reinforced and unreinforced loess, the dynamic modulus of elasticity decays exponentially with the increase of dynamic strain, but Ed rises with the increasing confinement pressure. When dynamic strain is less than 0.05%, the damping ration shows discrete distribution. While dynamic strain is large than 0.05%, the damping ratio goes up with the increaseing confinement pressure and dynamic strain. The reinforce material efficiently improves the dynamic modulus of elasticity and reduces the damping ratio. By establishing and comparing the normalized parameters of reinforce effectiveness, this paper illustrates that the reinforcement performance is affected significantly by the confinement pressure and load propagation direction and under medium confinement pressure the reinforcement shows better performance. In terms of the sample size of this test, 2 layers of reinforcement shows best performance. Under both the static and dynamic load, putting the reinforce material at 2/3 to 3/4 position of the loess sample will have better performance than other positions.