INFILTRATION INTO A SWELLING MATERIAL

J. R. PHILIP IN A SERIES OF PAPERS (PHILIP 1972) HAS PREDICTED MANY OF THE PROPERTIES OF FLOW IN SWELLING SYSTEMS. BECAUSE OF A PAUCITY OF EXPERIMENTAL DATA ON THESE MATERIALS HE HAS BEEN FORCED TO USE PLAUSIBLE ARBITRARY PROPERTIES FOR HIS ILLUSTRATIVE CALCULATIONS. THIS PAPER SEEKS TO CHECK SOME OF PHILIP'S PREDICTIONS BY EXAMINING INFILTRATION INTO A SATURATED CLAY. THE USE OF THIS MATERIAL RESULTS IN CONSIDERABLE SIMPLIFICATION OF THE MATHEMATICS WHILE THE ESSENTIAL CHARACTERISTICS OF THE SWELLING PHENOMENON, IN THE GRAVITATIONAL FIELD, ARE RETAINED. IT IS FOUND, AS PHILIP PREDICTS, THAT INFILTRATION IN SWELLING MATERIALS HAS MORE IN COMMON PHYSICALLY WITH CAPILLARY RISE THAN WITH INFILTRATION IN A RIGID SOIL. THIS ARISES BECAUSE IN A SATURATED SWELLING SOIL INFILTRATION IS ACCOMPANIED BY A NET INCREASE IN THE GRAVITATIONAL POTENTIAL ENERGY OF THE SYSTEM (IN COMMON WITH THE RIGID SOIL CAPILLARY RISE PROCESS); INFILTRATION IN A RIGID SOIL RESULTS IN A DECREASE IN THE POTENTIAL ENERGY OF THE WATER WHILE THAT OF THE SOLID IS UNCHANGED. IN ADDITION, THIS NET INCREASE IN THE POTENTIAL ENERGY OF THE SYSTEM, TOGETHER WITH THE FLOW PROPERTIES OF SWELLING CLAYS, RESULTS IN THE SORPTION COMPONENT OF THE INFILTRATION PROCESS BSEING TEMPORALLY MORE PERSISTENT, BY SEVERAL ORDERS OF MAGNITUDE, THAN IS THE CASE FOR RIGID SOILS. /AUTHOR/

  • Authors:
    • Smiles, D E
  • Publication Date: 1974-3

Media Info

  • Features: Figures; References;
  • Pagination: p. 140-7
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00238197
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 7 1974 12:00AM