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论文类型： 期刊论文

发表时间： 2019-08-30

发表刊物： GEOMECHANICS AND ENGINEERING

收录刊物： SCIE、EI

卷号： 18

期号： 6

页面范围： 627-638

ISSN号： 2005-307X

关键字： numerical simulation; confining stress; scale effect; representative elementary volume; jointed rock masses

摘要： 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.