JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2017, Vol. 47 ›› Issue (3): 125-129.doi: 10.6040/j.issn.1672-3961.0.2017.099

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Silt mudstone stress relaxation characteristics under tri-axial stress condition

CHEN Fangming, HU Quanguang, NING Guangzhong   

  1. No. 3 Engineering Co, Ltd., China Gezhouba Group, Xi'an 710000, Shaanxi, China
  • Received:2017-02-14 Online:2017-06-20 Published:2017-02-14

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Abstract: To investigate the stress relaxation characteristics of soft rock, step loading relaxation tests under tri-axial stress condition were performed with silt mudstone samples. Based on the analysis of silt mudstone relaxation characteristics with different confining stresses, the stress relaxation properties could be well reflected by the Burgers model. The evolution of stress relaxation rate with the change of original stresses was studied. The results showed that, when the original stress was lower, the stress relaxation rate decreased exponentially with the increase of the initial stress; while higher original stress was applied, the stress relaxation of some samples showed a slight increase trend.

Key words: silt mudstone, Burgers model, stress relaxation rate, stress relaxation test

CLC Number: 

  • TU45
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