LOCATING AND TRACING SEEPAGE WATER IN UNSTABLE SLOPES

A PRACTICAL METHOD OF LOCATING AND TRACING SEEPAGE WATER IN UNSTABLE SLOPES. THE STUDY CONSISTED OF TESTING SEVERAL METHODS AT SIDEHILL FILL LOCATIONS WHERE THE HIGHWAY WAS DISTRESSED. IN EACH CASE, CONSTRUCTION OF THE FILL HAD BLOCKED DRAINAGE. THE RESULTS OF THE STUDY INDICATE THE FOLLOWING: (1) CLEAN, FINE SAND DID NOT REMOVE FLUORESCENT DYE FROM SOLUTION FOR MODERATE PERCOLATION DISTANCES, BUT THE DYE BECAME SOMEWHAT LESS DETECTABLE DUE TO ITS ABSORPTION BY THE SAND FOR LONGER PERCOLATION DISTANCES. THE CONVENTIONAL MONITORING EQUIPMENT (ULTRAVIOLET LIGHT) WAS NOT SUFFICIENTLY EFFICIENT TO MONITOR LOW CONCENTRATIONS OF THE DYE. THE TRACER METHOD WAS NOT DEPENDABLE FOR THE PURPOSE OF LOCATING SEEPAGE WATERS AND WAS SHOWN TO REQUIRE FURTHER IMPROVEMENT. HOWEVER, IT WAS USED TO VERIFY A SUSPECTED SOURCE OF SEEPAGE WHEN THE GROUND WATER WAS BELIEVED TO HAVE TRAVELED THROUGH DEFINED CHANNELS OR VERY POROUS MATERIAL. (2) THE WATER TABLE OBSERVATION METHOD WAS THE MOST DEFINITIVE AND USEFUL OF THE METHODS STUDIED FOR TRACING AND LOCATING SEEPAGE WATER. (3) THE ELECTRICAL RESISTIVITY METHOD DID NOT YIELD VERY ACCURATE AND DEPENDABLE RESULTS WITHOUT CORRELATION WITH ACTUAL SITE MOISTURE CONDITIONS. (4) WITH MORE AND BETTER SELECTION OF SAMPLING HOLES AND RESISTIVITY OBSERVATIONS, MORE USEFUL RESULTS COULD BE OBTAINED FROM THIS METHOD. SINCE THE RESISTIVITY RESULTS SHOW FAIR CORRELATIONS WITH ACTUAL MOISTURE CONDITIONS, IT IS CONCLUDED THAT THIS METHOD COULD BE USED AS A PRELIMINARY GUIDE AS TO WHERE DRILLING SHOULD BE PERFORMED, AND POSSIBLY TO EXTEND RELATIVE MOISTURE CONTENT DATA TO AREAS INACCESSIBLE TO DRILLING EQUIPMENT. /BPR/

  • Corporate Authors:

    Kentucky Department Highways

    ,    

    Bureau of Public Roads /US

    400 7th Street, SW
    Washington, DC  United States  20590
  • Authors:
    • Alkhoja, Y A
    • Scott, G D
  • Publication Date: 1969-8

Subject/Index Terms

Filing Info

  • Accession Number: 00233722
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Report/Paper Numbers: Hpr- Kyhpr 63-16
  • Files: TRIS, STATEDOT
  • Created Date: Dec 22 1994 12:00AM