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Geomechanics and Engineering
  Volume 18, Number 6, August30 2019, pages 627-638
DOI: http://dx.doi.org/10.12989/gae.2019.18.6.627
 


Effect of confining stress on representative elementary volume of jointed rock masses
Na Wu, Zhengzhao Liang, Yingchun Li, Xikun Qian and Bin Gong

 
Abstract
    Estimation of representative elementary volume (REV) of jointed rock masses is critical to predict the mechanical behavior of field-scale rock masses. The REV of jointed rock masses at site is strongly influenced by stress state. The paper proposed a method to systematically studied the influence of confining stress on the REV of jointed rock masses with various strengths (weak, medium and strong), which were sourced from the water inlet slope of Xiaowan Hydropower Station, China. A finite element method considering material heterogeneity was employed, a series of two-dimensional (2D) models was established based on the Monte-Carlo method and a lot of biaxial compressive tests were conducted. Numerical results showed that the REV of jointed rock masses presented a step-like reduction as the normalized confining stress increased. Confining stress weakened the size effect of jointed rock masses, indicating that the REV determined under uniaxial compression test can be reasonably taken as the REV of jointed rock masses under complexed in-situ stress environment.
 
Key Words
    numerical simulation; confining stress; scale effect; representative elementary volume; jointed rock masses
 
Address
Na Wu, Zhengzhao Liang, Yingchun Li, Xikun Qian and Bin Gong: State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China
 

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