CONTROL OF SLIDE BY VERTICAL SAND DRAINS

THE VIRGINIA HIGHWAY DEPARTMENT WAS RELOCATING AND WIDENING A HIGHWAY LOCATED IN ROUGH AND MOUNTAINOUS TERRAIN, WITH THE MOUNTAINS BEING CUT BY NUMEROUS STREAMS FORMING A NUMBER OF WATER GAPS. EXCAVATION SHOWS THAT THE ROAD PASSED THROUGH A THICK MANTLE OF TALUS, MOSTLY SANDY SOIL, AND BOULDERS. SLIDES SHOWED EVIDENCE OF DEVELOPING IN THE TALUS MATERIAL. STUDY DISCLOSED THE PRESENCE OF A HORIZONTAL BED OF PLASTIC VARVED IMPERVIOUS CLAY ABOUT 35 FEET ABOVE GRADE. IT WAS FEARED THAT WATER DRAINING THROUGH THE LOOSE SAND WOULD REACH THIS BED OF CLAY, THEN FOLLOW IT AND BREAK OUT ON THE SLOPE. SAND DRAINS WERE INSTALLED IN HOPES THAT THE WATER WOULD BE CARRIED DOWN AND DISCHARGED IN THE POROUS MATERIAL AT THE BOTTOM. A WELL-DRILLING COMPANY CONTRACTED TO DRILL THE HOLES. THESE DRAINS WERE CONSTRUCTED AT LOW COST AND HAVE PERFORMED WELL FOR SEVEN YEARS. IT IS CONCLUDED THAT THESE DRAINS ARE OPERATING EFFICIENTLY AND CONTROLLING DRAINAGE PROBLEMS.

Media Info

  • Monograph Title: Vertical sand drains for stabilization of embankments
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00235367
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Oct 7 1994 12:00AM