USE OF PORTABLE SEISMIC EQUIPMENT FOR SUBSURFACE EXPLORATION AND SALT STABILIZATION OF SUBGRADE

THE USE IS DESCRIBED OF PORTABLE SEISMIC EQUIPMENT FOR SUBSURFACE EXPLORATION. THE USE IS ALSO DESCRIBED OF A PORTABLE REFRACTION SEISMOGRAPH ON A RAILROAD IN COLORADO IN AN ATTEMPT TO LOCATE POTENTIAL SINK HOLES NEAR THE TRACK CAUSED BY CAVITIES IN UNDERLYING SOIL OR GYPSUM BEDROCK. A CUT-FILL WAS INVESTIGATED ALONGSIDE A MOUNTAIN ON WHICH THE RAILROAD WAS CONSTRUCTED. THE GYPSUM WAS FOUND NOT TO BE PRESENT IN LARGE ENOUGH DEPOSITS TO FORM LARGE CAVITIES BY ITSELF. THE SEISMIC EQUIPMENT IS CONCLUDED TO BE OF VALUE IN DETERMINING SUBGRADE CONDITIONS FOR EXCAVATION AND FOUNDATIONS CONDITIONS. IT IS NOT INTENDED AS A COMPLETE SUBSTITUTE FOR TEST BORINGS, BUT RATHER TO AUGMENT THE INFORMATION OBTAINED THROUGH SUCH BORINGS. SALT STABILIZATION OF SUBGRADE WAS USED SUCCESSFULLY TO PROVIDE A DENSE, IMPERVIOUS LAYER BETWEEN THE SUB-BASE, WHICH WAS PREDOMINANTLY CLAY, AND THE SUB-BALLAST TO PREVENT SEEPAGE OF SURFACE WATER INTO THE SUB-BASE. INSPECTION AFTER TWO YEARS SHOWED HARD SHOULDERS, NO EROSION, AND THE SURFACE AND CROSS LEVEL OF THE TRACK ARE IN GOOD SHAPE. NO EVIDENCE OF PUMPING WAS FOUND. THE NATURAL AFFINITY OF SALT FOR WATER SEEMS TO PROVIDE THE NECESSARY MOISTURE FROM A HUMID ATMOSPHERE TO MAKE THE CLAY PRACTICALLY IMPERVIOUS.

  • Supplemental Notes:
    • Vol 68, BulL 605, PP 502-505
  • Publication Date: 0

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  • Accession Number: 00231308
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 15 2004 2:41AM