PROBABILISTIC ANALYSIS OF SEEPAGE

IN NATURAL SEDIMENTS THE SOILS WITH HIGH PERMEABILITY FREQUENTLY OCCUR AS LAYERS OR LENSES OF SAND AND GRAVEL WITHIN A MASS OF SOIL WITH MUCH SMALLER PERMEABILITY SUCH AS SILT OR FINE SAND (GEOMETRIC CHARACTERISTICS). A STATISTICAL MODEL HAS BEEN FORMULATED WICH DESCRIBES THESE GEOMETRIC CHARACTERISTICS AND WHICH CAN BE USED TO COMPUTE THE PROBABILITY DISTRIBUTION OF SEEPAGE. STUDIES OF THE MISSISSIPPI RIVER ALLUVIUM AND FLUVIAL- GLACIAL DEPOSITS SHOW THAT STATISTICAL PARAMETERS MAY BE OBTAINED FROM EXCAVATIONS AND BORING RECORDS. A NETWORK SYSTEM MODEL CONTAINING STATISTICAL SYSTEM COMPONENTS MAY BE USED TO ANALYZE SEEPAGE THROUGH NONHOMOGENOUS SOIL DEPOSITS. THE SOLUTION GIVES THE PROBABILITY DISTRIBUTION FUNCTION OF SEEPAGE. THE SEEPAGE COMPUTED BY THE NETWORK MODEL FOR PORT ALLEN LOCK AND GRANVILLE DAM ARE IN GENERAL AGREEMENT WITH THE MEASURED SEEPAGE. CHARACTERISTICS WILL DIFFER CONSIDERABLY WITH THE SITE, EVEN FOR DEPOSITS OF SIMILAR GENERAL GEOLOGIC ORIGIN. THE PROBABILITY DISTRIBUTION OF SEEPAGE PERMITS THE USE OF RISK ANALYSIS IN DESIGN AGAINST SEEPAGE WHICH ALWAYS INVOLVES A LARGE DEGREE OF UNCERTAINITY. USING THE CASE OF PORT ALLEN LOCK AS AN EXAMPLE, IT IS ILLUSTRATED HOW THE DESIGNER MAY CHOOSE THE QUANTITY OF SEEPAGE. GRAPHICAL REPRESENTATIONS OF SOIL PROFILES, EXCAVATION SITES AND NETWORK MODELS ARE INCLUDED, AND THE DERIVATION OF EQUATIONS IS EXPLAINED.

  • Authors:
    • Wu, T H
    • Vyas, S K
    • Chang, N Y
  • Publication Date: 1973-4

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Filing Info

  • Accession Number: 00236652
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 17 1973 12:00AM