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Assessing the Internal Stability of Filters Designed by the NRCS Procedure

  • Technical Note - Civil Engineering
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Abstract

A widely accepted method of filter design is the “US Natural Resources Conservation Service” (NRCS, Gradation design of sand and gravel filters, 1994) procedure in which a lot of criteria are suggested to satisfy proper filtration and permeability requirements of the filter and to prevent segregation during construction, yet the internal stability against suffusion is not fully considered. The method of Wan and Fell (J Geotech Geoenviron Eng 134(3):401–407, 2008) is adopted to assess the internal stability of granular filters. Theoretical analysis confirmed by experimental tests shows that the NRCS yields internally unstable filters in some special cases.

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Abbreviations

Cu :

Coefficient of the uniformity

D 5 :

The particle diameter corresponding to 5 % finer

D 10 :

The particle diameter corresponding to 10 % finer

D 15 :

The particle diameter corresponding to 15 % finer

D 20 :

The particle diameter corresponding to 20 % finer

D 60 :

The particle diameter corresponding to 60 % finer

D 90 :

The particle diameter corresponding to 90 % finer

D 100 :

The particle diameter corresponding to 100 % finer

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Authors and Affiliations

  1. College of Civil and Transportation Engineering, Hohai University, Nanjing, People’s Republic of China

    Yousif A. H. Dallo, Yuan Wang & Samson T. Tekle

  2. College of Engineering, Mosul University, Mosul, Iraq

    Yousif A. H. Dallo

Authors
  1. Yousif A. H. Dallo
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  2. Yuan Wang
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  3. Samson T. Tekle
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Correspondence to Yousif A. H. Dallo.

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Dallo, Y.A.H., Wang, Y. & Tekle, S.T. Assessing the Internal Stability of Filters Designed by the NRCS Procedure. Arab J Sci Eng 39, 2733–2737 (2014). https://doi.org/10.1007/s13369-013-0882-9

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  • DOI: https://doi.org/10.1007/s13369-013-0882-9

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