MEASUREMENTS OF A SWELLING CLAY IN A PONDED CUT

PONDING IS THE CONTAINING OF WATER ON A CLAY SUBGRADE OF HIGH SWELLING POTENTIAL IN ORDER TO CAUSE POTENTIAL SOIL SURFACE HEAVES TO OCCUR BEFORE A HIGHWAY PAVEMENT IS CONSTRUCTED. THE EFFECTIVENESS OF THE USE OF PONDING, IN TEXAS AND ELSEWHERE, OVER THE LAST FOUR DECADES IS REVIEWED HERE. A DEEP CUT SECTION OF U.S. 90 UNDER CONSTRUCTION WEST OF SAN ANTONIO WAS PONDED FOR FROM 30 TO 45 DAYS IN THE SPRING OF 1970. DEEP BENCH MARKS SET AT 2 FEET, 3.3 FEET, 4.5 FEET, 10.5 FEET, AND 19 FEET WERE USED TO RECORD VERTICAL MOVEMENTS BEFORE, DURING, AND AFTER PONDING AT THREE LOCATIONS WITHIN AND ONE LOCATION OUTSIDE OF THE POND. NUCLEAR DEPTH PROBES WERE USED IN THREE ACCESS TUBES TO MEASURE CHANGES IN MOISTURE CONTENT AND DRY DENSITY IN THE VICINITY OF ONE SET OF BENCH MARKS. THE SURFACE WATER PENETRATED ONLY THE UPPER 3 FEET OF SOIL DURING THE PONDING BUT SOME WETTING AT DEPTH WAS INDICATED AFTER THE AREA HAD BEEN DRAINED. ABOUT 50 PERCENT OF THE POTENTIAL VERTICAL RISE WAS ACHIEVED BY THE PONDING.

  • Supplemental Notes:
    • REPORT NO 118-6
  • Corporate Authors:

    University of Texas, Austin

    Center for Highway Research, 200 West 21st Street
    Austin, TX  United States  78712
  • Authors:
    • Watt, W G
    • Steinberg, M L
  • Publication Date: 1972-6

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 60 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00238100
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 8 1973 12:00AM