Citation

Yin XT, Ding WH, Li CG, Wang SL. Zhejiang Daxue Xuebao Gongxue Ban 2010; 44(10): 1944-1949.

Copyright

(Copyright © 2010, Zhejiang da xue chu ban she)

DOI

10.3785/j.issn.1008-973X.2010.10.017

PMID

unavailable

Abstract

Taking sandstone as object, a virtual specimen and uniaxial compression test of sandstone was conducted under particle flow code with its embedded fish language according to the experimental results of sandstone's grain analysis, compression strength, tensile strength and its cohesion or friction angle tests. The uniaixal compression tests with seven kinds of strain rate such as 10-3, 510-3, 10-2, 210-2, 510-2, 10-2, 210-2 s-2 were designed to analyze the effect of strain rate. The influences of rupture process, crack number and propagation, curve of stress and strain, energy transformation derived from strain rate were analyzed. Results show that the increase of strain rate ruins the advantageous shear zone's development, which makes the shear zone expand with the same velocity, and the material failure plane changes from shearing failure to cone breakage. The strain rate meso-enhances the material mechanics and deformation features with the uplifting of stress-strain curve's slope and peak value. Total cracks increase with the decreasing tensile crack and the increasing shearing crack. The boundary energy enhances, so the friction energy, kinetic energy and strain energy monotonically increase, which illustrates the increase of shear crack, violent failure and rockburst of side.