›› 2015, Vol. 36 ›› Issue (11): 3143-3149.doi: 10.16285/j.rsm.2015.11.014

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study of damping ratio of frozen soil under stepwise loading

LUO Fei1, 2, HE Yi-ting1, ZHAO Shu-ping2, ZHU Zhan-yuan1, 2, MAO Lei2   

  1. 1. College of Civil Engineering, Sichuan Agricultural University, Dujiangyan, Sichuan 611830, China; 2. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
  • Received:2015-07-20 Online:2015-11-11 Published:2018-06-14
  • Supported by:

    Project supported by the Project of Sichuan Provincial Department of Education (Grant No.035Z1041), the Center Project of Sichuan Provincial Institution of Higher Learning in the Disaster Prevention and Reduction of Villages and Towns (Grant No.CDPMV1407) and the College Students Innovation Training Program of Sichuan Agricultural University (Grant No.04060692).

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Abstract: 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.

Key words: frozen soil, MTS-810 vibration triaxial testing machine, damping ratio, dynamic strain amplitude

CLC Number: 

  • TU 431
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