APPLICATION OF THE MODULUS OF PASSIVE RESISTANCE OF SOIL IN THE DESIGN OF FLEXIBLE PIPE CULVERTS

EXPERIMENTS CONDUCTED IN THE 1930'S WERE DIRECTED TOWARD PREDICTING THE PROBABLE DEFLECTION OF A FLEXIBLE PIPE CULVERT UNDER AN EARTH EMBANKMENT. IN THIS WORK, LATERAL PRESSURES WERE FOUND TO BE PROPORTIONAL TO THE HORIZONTAL DEFLECTION OF THE PIPE SIDES. THIS PROPORTIONALITY FACTOR WAS CALLED THE MODULUS OF PASSIVE RESISTANCE OF THE SOIL. THE MAXIMUM UNIT PRESSURE AT THE ENDS OF THE HORIZONTAL DIAMETER WAS EXPRESSED BY THE PRODUCT OF ONE-HALF THE HORIZONTAL DEFLECTION OF THE PIPE BY THE MODULUS. THE PRESSURE ABOVE AND BELOW THE END POINTS DECREASED PARABOLICALLY TO ZERO AT POINTS ON THE ARC 50 DEG. ABOVE AND BELOW THE HORIZONTAL DIAMETER. WITH THIS LOAD HYPOTHESIS ESTABLISHED, IT WAS POSSIBLE TO ANALYZE A FLEXIBLE PIPE CULVERT AS AN ELASTIC THIN RING AND TO DEVELOP A PREDICTION EQUATION FOR THE PIPE DEFLECTION IN TERMS OF EARTH LOAD, PIPE DIMENSIONS AND ELASTIC PROPERTIES, AND THE MODULUS OF PASSIVE RESISTANCE OF THE SOIL. THE APPARATUS AND PROCEDURES USED TO MEASURE THE MODULUS IN THE LAB ARE DESCRIBED. THE CORRELATION BETWEEN MEASURED VALUES OF THE MODULUS AND SOME PROPERTIES OF THE SOIL USED, PARTICULARLY DENSITY, ARE PRESENTED, TOGETHER WITH SOME QUALITATIVE COMPARISONS WITH ESTIMATED VALUES OF THE MODULUS IN BOTH EXPERIMENTAL AND ACTUAL CULVERTS. EXPERIMENTAL PROCEDURES EMPLOYED ARE DESCRIBED. THE CORRELATION BETWEEN MEASURED VALUES OF THE MODULUS AND SOME PROPERTIES OF THE SOILS USED, PARTICULARLY DENSITY, ARE PRESENTED TOGETHER WITH SOME QUALITATIVE COMPARISONS WITH ESTIMATED VALUES OF THE MODULUS IN BOTH EXPERIMENTAL AND ACTUAL CULVERTS UNDER EMBANKMENTS. /AUTHOR/

  • Supplemental Notes:
    • Vol 36, pp 371-381, 9 FIG, 3 TAB
  • Authors:
    • Spangler, M G
    • Donovan, J C
    • Brown, D N
  • Publication Date: 1957

Language

  • English

Media Info

  • Monograph Title: Proceedings of the Thirty-Sixth Annual Meeting of the Highway Research Board, Washington, D.C., January 7-11, 1957
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00234408
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 2004 7:57PM