00478089

Component

http://onlinepubs.trb.org...trr/1988/1159/1159-007.pdf

https://scholar.google.co...Ladd&publication_year=1988

Wick drains were installed along portions of the 2-mi-long highway embankment crossing up to 50 ft of soft highly plastic clay deposited in a cutoff oxbow of the Missouri River in Omaha, Nebraska. About 1,650,000 lineal feet of 4-in.-wide band-type wick drains were installed in a triangular pattern at spacings ranging from 3.25 to 5.5 ft to facilitate strength gain of the foundationn clays during stage construction and to precompress the clays under a surcharge before paving. The wick drains have allowed the excess pore water pressures generated by fill placement to dissipate. Apparent horizontal coefficients of consolidation calculated from pore pressure and settlement observations range from about one-half to several times the values estimated for design. Measurements during three consolidation intervals to date have shown that the wick drains continue to function without significant changes in the apparent horizontal coefficient of consolidation after vertical strains greater than 15 percent and total settlements greater than 5 ft. Instrumentation placed between the wick drains has shown that the apparent horizontal coefficient of consolidation is significantly smaller where the wick drain spacing is 3.25 ft than in similar soil layers where the spacing is 5.5 ft.

This paper appears in Transportation Research Record No. 1159, Prefabricated Vertical Drains and Pavement Drainage Systems. 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

01416410

p. 58-67

1988

Transportation Research Record

0309046688

Figures (16) ; References (6)

Consolidations; Embankments; Pore water pressures; Road construction; Soft clays; Spacing; Wick drains

Geotechnology; Highways; I42: Soil Mechanics

TRIS, TRB, ATRI

Dec 31 1988 12:00AM

• CORE FLOW-CAPACITY REQUIREMENTS OF GEOCOMPOSITE FIN-DRAIN MATERIALS USED IN PAVEMENT SUBDRAINAGE
• DESIGN, CONSTRUCTION, AND EVALUATION OF WEST VIRGINIA'S FIRST FREE-DRAINING PAVEMENT SYSTEM
• HYDRAWAY EDGEDRAIN EXPERIENCE IN OHIO
• PERFORMANCE OF A PREFABRICATED VERTICAL DRAIN INSTALLATION BENEATH AN EMBANKMENT
• PERFORMANCE OF WICK DRAINS IN NEW ORLEANS CLAYS
• SUBBASE PERMEABILITY AND PAVEMENT PERFORMANCE