Volume 23 Issue 6
Dec.  2017
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MU Huandong, SUN Ping, LI Rongjian, et al., 2017. DYNAMIC DAMPING CHARACTERISTICS AND EVOLUTION LAW OF PAN'AN STRUCTURAL LOESS. Journal of Geomechanics, 23 (6): 935-942.
Citation: MU Huandong, SUN Ping, LI Rongjian, et al., 2017. DYNAMIC DAMPING CHARACTERISTICS AND EVOLUTION LAW OF PAN'AN STRUCTURAL LOESS. Journal of Geomechanics, 23 (6): 935-942.

DYNAMIC DAMPING CHARACTERISTICS AND EVOLUTION LAW OF PAN'AN STRUCTURAL LOESS

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  • Received: 2017-05-28
  • Published: 2017-12-01
  • Seismic action often leads to the decay of dynamic strength of structural loess and a series of geological disasters such as loess landslide and depression, and attenuation of intensity is closely related to its damping characteristics, which makes dynamic damping characteristics of structural loess and its evolution law one of the important research topics of geotechnical engineering. In this article, the dynamic characteristics of undisturbed loess and remolded loess under natural and saturated conditions were studied. On the basis of experiments, the dynamic modulus, dynamic damping response characteristics and evolution law of loess are analyzed and compared. The results show that:(1) The dynamic stress of the original loess and remolded loess increases with the increase of the dynamic strain, while the dynamic modulus decreases with the increase of the dynamic strain, and the dynamic damping ratio increases with the increase of the dynamic strain; (2)Affected by structural properties of loess, the undisturbed loess is slightly larger than that of the remolded loess, and the maximum modulus of the undisturbed loess and remolded loess are slightly larger than that of saturated undisturbed loess and saturated remolded loess. The influence of the surrounding pressure on the damping ratio needs to be considered when the loess structure is strong, and the effect of the surrounding pressure on the damping ratio can be neglected by the saturated remolded loess.

     

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