As a typical granular material, sand is widely used in infrastructure construction. In order to study the influence of dynamic normal stress amplitude on the frictional characteristic of granular material, a large dynamic shear box device is used to perform the dynamic shear test on standard sand. Experimental results show that: (1) The changing pattern of shear stress, friction coefficient and normal displacement under dynamic normal stresses show variation characteristics. (2) In the stable sliding stage, the peak and valley values of shear stress increase first and then decrease with increasing normal stress amplitude, and the maximum peak shear stress is larger than that under constant normal stress. (3) There is an obvious phase shift between the peak normal stress and peak shear stress, which decreases with increasing shear displacement and increases with increasing dynamic normal stress amplitude. However, there is no phase shift between the valley normal stress and shear stress. (4) The normal displacement under dynamic normal stress increases with increasing dynamic normal stress amplitude, and it is much larger than that under constant normal stress. The study can provide a reference for determining the strength parameters of sand under dynamic load conditions in practical engineering.
Dang Wengang
,
Zheng Juntao
,
Chen Junpeng
. Influence Study of Dynamic Normal Stress Amplitude on Frictional Characteristics of Granular Materials[J]. Chinese Journal of Underground Space and Engineering, 2025
, 21(2)
: 461
-471
.
DOI: 10.20174/j.JUSE.2025.02.12
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