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Volume 38 Issue 8
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GUO Wan-li, ZHU Jun-gao, WEN Yan-feng. Unified description for four grading scale methods for coarse aggregate[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(8): 1473-1480. DOI: 10.11779/CJGE201608015
Citation: GUO Wan-li, ZHU Jun-gao, WEN Yan-feng. Unified description for four grading scale methods for coarse aggregate[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(8): 1473-1480. DOI: 10.11779/CJGE201608015
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Unified description for four grading scale methods for coarse aggregate

  • 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing 210098, China; 3. Department of Geotechnical Engineering, China Institute of Water Resources and Hydropower Research, Beijing 100038, China

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  • Received Date: July 02, 2015
  • Published Date: August 24, 2016
    Graphical Abstract
    • Abstract
  • A gradation equation is used to describe the four grading scale methods in the Chinese standard, which are exclusion method, similar grading method, equivalent substitution method and hybrid method, and a new and unified equation is put forward to calculate the gradation after reducing the scale. The relationship between the parameters (dmax, b, m and C) of the new equation and those of the old equation (d0max, b0 and m0) is studied and revealed. The results show that the new parameter m of the four methods is m=m0, and parameter C of the exclusion method and the similar grading method is C=0, and parameter b of the equivalent substitution method and the hybrid method is, and the parameter C of the equivalent substitution method is decided by and P5. This method is simpler than the methods in the Chinese standard; and especially for the hybrid method, the fine particle content P5 can be defined firstly. To some extent, the unified equation makes it possible to study the reduced scale effects quantitatively and systematically. At the same time, the reduced scale calculation of soil gradation for rockfill of Nuozhadu Dam is demonstrated according to this relationship.
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    • References (15)
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