IMPROVED PERFORMANCE OF UNPAVED ROADS DURING SPRING THAW

摘要: Unpaved roads in Vermont are subject to deterioration from seasonal freezing and thawing, many towns have that suffer chronic serviceability problems during the so-called "spring thaw," or mud season. Several techniques thought mitigate of unpaved spring thaw were constructed on test sections two towns. Each potential remedy was aimed at providing some combination limiting availability moisture winter, improving drainage spring, strengthening upper portion road. technique used local and/or commercially available materials, all easy construct, i.e., a town road crew could build them. For seasons, authors compared strength estimates based dynamic cone penetrometer tests percentage surface rutted for treated control sections. Methods permanently improved top 12 inches decreased water content resulted significant performance improvement thaw. Cement cellular confinement systems worked well by layers soil. Two new techniques--geowrap, comprising clean sand sandwiched geotextile separators placed 12-18 deep, patented Geosynthetic Capillary Barrier Drain--provided benefit keeping soil relatively dry. Geogrid inch deep trench drains parallel provided no observable benefit.