The MTS-810 vibration triaxial testing machine is used to study the change law of damping ratio of frozen clay and loess with different loading frequencies

confining pressures and temperatures. The results show that for frozen clay

the damping ratio firstly decreases and then gradually increases with the increase of dynamic strain amplitude under the conditions mentioned above. For frozen loess

the damping ratio firstly decreases and then tends to be a stable value with the increase of dynamic strain amplitude. Damping ratios of frozen clay and frozen loess decrease with the increase of loading frequencies

and changes slightly with the increase of confining pressure under the same dynamic strain amplitude. The change of damping ratio is insignificant with the confining pressure when the temperature is in the range of -0.2 to -1 ℃

the value of damping ratio of frozen soil at the temperature of -2 ℃ is apparently less than that at the temperature of -0.2 to -1 ℃. Damping ratio is greatly affected by frequency at a relatively low dynamic stress level and is greatly affected by temperature at a relatively high dynamic stress level. In the whole loading process

damping ratio is minimally affected by confining pressure. The influence of frequency on frozen loess is greater than that on frozen clay when the dynamic strain amplitude is at relative low level. With the increase of dynamic stress

the influence of frequency on frozen loess is gradually less than that on frozen clay. In the whole loading process

temperature has greater influence on frozen loess than on frozen clay

while confining pressure has less influence on frozen loess than on frozen clay.