00235367

Component

http://onlinepubs.trb.org...rbbulletin/115/115-005.pdf

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.

No 115, pp 51-52 Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

01410516

1955

Highway Research Board Bulletin

Digital/other

Drainage; Impervious soils; Mountains; Pavement widening; Plastic soils; Relocation (Facilities); Road construction; Sand; Sand drains; Soils; Varved clays

Relocation; Widening

Geotechnology; Highways; Hydraulics and Hydrology

TRIS, TRB

Oct 7 1994 12:00AM

• ECONOMIC ASPECTS OF VERTICAL SAND DRAINS
• MODIFICATION OF SAND-DRAIN PRINCIPLE FOR PRESSURE RELIEF IN STABILIZING EMBANKMENT FOUNDATION
• SAND DRAINS FOR EMBANKMENT ON MARL FOUNDATION
• STABILIZATION OF MARSH DEPOSIT