DRILL-LIME TREATMENT OF SHALLOW RAILWAY SUBGRADE FAILURES IN EXPANSIVE CLAYS

A METHOD OF STABILIZING ROADBEDS BY APPLYING HYDRATED LIME TO HOLES DRILLED IN THE SUBGRADE IS DESCRIBED. RAILWAY ROADBEDS WHICH ARE UNDERLAID BY SOILS THAT FAIL UNDER INCREASED LOADS ARE EVIDENCED BY SQUEEZING OR HEAVING AT THE ENDS OF TIES OVER SECTIONS VARYING IN LENGTH FROM 10 TO 100 FT. SEVERAL FORMERLY LIGHT-TRAFFIC LINES IN SOUTH-CENTRAL ALABAMA WERE LAID ACROSS PRAIRIE CLAYS WHICH DEMONSTRATED HIGHLY PLASTIC AND HIGH-SHRINKAGE CHARACTERISTICS. THE PH TESTS DESCRIBED IN A REPORT BY THE COMMITTEE ON ROADBEDS INDICATED THESE SOILS WOULD RESPOND TO LIME TREATMENT. SEVERAL METHODS CURRENTLY USED TO PRODUCE A LIME-STABILIZED SOIL WERE CONSIDERED AND REVIEWED. THE METHOD SELECTED, THE APPLICATION PATTERNS, EQUIPMENT, OPERATIONS AND COSTS ARE DESCRIBED. SHORT-TERM OBSERVATION OF RESULTS OF THE DRILL- LIME WORK IN ABOUT 80 LOCATIONS SHOW AN APPRECIABLE REDUCTION IN MAN-HOURS SPENT LINING AND SURFACING. WHILE IT IS TOO EARLY TO EVALUATE PERMANENT RESULTS, IT APPEARS THIS METHOD WILL OFFER RELIEF TO AREAS HAVING THE FOLLOWING COMBINATION OF FEATURES: (1) EXPANSIVE CLAYS RESPONDING TO LIME TREATMENT; (2) TRACK AREAS HAVING SHALLOW BALLAST SECTIONS; AND (3) SHALLOW SUBGRADE FAILURES.

  • Supplemental Notes:
    • No 626, Vol 71, PP 574-579, 5 FIG
  • Authors:
    • Farris, J B
  • Publication Date: 0

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  • Accession Number: 00232826
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 15 1970 12:00AM