SEEPAGE FLOW IN RIVER EMBANKMENT AND ITS INFLUENCE ON STABILITY OF SLOPE (JULY 1972)

The movement of water through a river embankment is described, and its influence upon the stability of the slope of the embankment are detailed. The seepage flow caused by rainfall in the embankment is usually unsaturated flow. The unsaturated moisture flow equation is obtained from a consideration of the relationship between a capillary head and a degree of saturation, and the non-steady flow in the embankment is discussed by means of the numerical solution of the equation. This solution agrees with the results of experiments with both small and full scale model. Non- steady flow in the embankment by a fluctuation of water level is also discussed. A graphical method is described for the solution of this kind of seepage during a flood and the solutions obtained are in reasonable agreement with observations in the actual embankment. A full scale model test is utilized to explain the loss of stability of an embankment with seepage. The phenomenon is associated with a decrease in shear strength of soils and an increase in unit weight of soils. A study of the use of impermeable membranes (eg asphalt) to cover the crown or berm of the embankment to promote its stability during rainwater seepage, proved such membranes to be effective against failure. A study was conducted on the applicability of the graphical method to solve the seepage of water into the embankment due to a rise in the external water level. Studies indicate that it is possible to explain the phenomenon of slop failure during rainfall by finding out the relationship between the moisture content and the shear strength of unsaturated soil.

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  • Corporate Authors:

    Public Works Research Institute

    2-28-32 Honkomagome, Bunkyo-ku
    Tokyo,   Japan 
  • Authors:
    • Yamamura, Kazuhiro
    • Kutara, K
  • Publication Date: 1974

Media Info

  • Features: Figures; Photos; References;
  • Pagination: p. 89-152
  • Serial:

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Filing Info

  • Accession Number: 00080838
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 6 2003 12:00AM