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Volume 33 Issue 11
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LIU Dong-yan, ZHAO Bao-yun, ZHU Ke-shan, XUE Kai-xi. Direct tension creep behaviors of sandstone and improvement and application of Burgers model[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(11): 1740-1744.
Citation: LIU Dong-yan, ZHAO Bao-yun, ZHU Ke-shan, XUE Kai-xi. Direct tension creep behaviors of sandstone and improvement and application of Burgers model[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(11): 1740-1744.
shu

Direct tension creep behaviors of sandstone and improvement and application of Burgers model

  • (1. College of Civil Engineering, Chongqing University, Chongqing 400045, China; 2. School of Civil Engineering and Architecture, Chongqing University of Science & Technology Chongqing, Chongqing 401331, China)

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  • Published Date: November 14, 2011
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    • Abstract
  • The direct tension creep of red sandstone is tested by means of the rock direct tension device developed by the authors. The test results indicate that the sandstone in direct tension under the low stress condition is characterized by primary creep and steady-state creep while under high stress conditions by a rather short accelerated creep stage. Based on the creep behaviors of the sandstone, the Burgers model is improved by introducing a nonlinear viscoplastic body, and the direct tension creep test results are fitted by using the BFGS algorithm. The improved Burgers creep model agrees with the experimental curve. The introduction of the nonlinear viscoplastic body with the initial viscosity value ηN as large as over 1019 (MPa.h) implies that the nonlinear viscoplastic body in the sandstone acceleration creep stage plays a leading role. The improved Burgers model can describe the primary creep and steady-state creep of sandstone under direct tension and better describe the process of the accelerated creep. It is concluded that it is important to evaluate the effects of tensile on the stability of geotechnical engineering.
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