LABORATORY INVESTIGATION OF SOIL INFILTRATION THROUGH PIPE JOINTS

RESULTS ARE PRESENTED OF A LABORATORY INVESTIGATION TO DEVELOP A SYSTEM OF CLASSIFYING SOILS ACCORDING TO THE DEGREE THAT SOIL INFILTRATION THROUGH OPENINGS IN PIPE JOINTS OR SEAMS MAY BE EXPECTED TO OCCUR. THE FOLLOWING SOILS WERE TESTED' A POORLY GRADED, MEDIUM TO FINE SAND, A UNIFORMLY GRADED, FINE SAND, A SILT, AND A LEAN CLAY. THE INVESTIGATION INCLUDED DESIGN AND CONSTRUCTION OF A MODEL SIMULATING A PROTOTYPE PIPE JOINT, STUDY OF THE FEASIBILITY OF USING THE MODEL FOR SUCH STUDIES, INVESTIGATION OF THE VARIABLES AFFECTING SOIL INFILTRATION, AND INVESTIGATION OF THE INFILTRATION CHARACTERISTICS OF THE FOUR SOILS. RESULTS SHOWED THAT THE MODEL PROVIDED A FEASIBLE MEANS OF STUDYING SOIL INFILTRATION THROUGH PIPE JOINTS. THE IMPORTANT FACTORS LEADING TO SUCH INFILTRATION ARE SOIL GRADATION, DENSITY, AND SIZE AND CONFIGURATION OF JOINT OPENING. THE STUDY ALSO INDICATED THAT EXTERNALLY INDUCED VIBRATION HAS A SIGNIFICANT EFFECT ON INFILTRATION OF COHESIONLESS SOIL. FOR STABILITY AGAINST INFILTRATION, THE RESULTS OF THE LIMITED INVESTIGATION INDICATE THAT RATIOS OF D 85 TO JOINT OPENINGS SHOULD BE LESS THAN 0.28 FOR THE MEDIUM TO FINE SAND AND 0.21 FOR THE UNIFORM SAND. IT IS RECOMMENDED THAT COHESIONLESS BACKFILL USED AROUND CORRUGATED METAL PIPE HAVE A MINIMUM D 85 SIZE OF ABOUT 2 MM FOR SIZES OF PIPE LARGER THAN 12 IN. DIAMETER AND A MINIMUM D 85 SIZE OF ABOUT 1 MM FOR PIPE 12 IN. OR SMALLER IN DIATMETER.

  • Supplemental Notes:
    • No 3-781, 46 PP, 6 FIG, 12 TAB, 8 PHOT, 6 REF, 1 APP
  • Authors:
    • Nettles, E H
    • Compton, J R
  • Publication Date: 1967-6

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  • Accession Number: 00204095
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 30 1994 12:00AM