00648222

Component

http://onlinepubs.trb.org...trr/1993/1425/1425-003.pdf

https://scholar.google.co...ason&publication_year=1993

Field investigation results of narrow-trench compaction methods with granular materials are presented. To determine what levels of compaction energy would produce target densities of at least 95% of standard Proctor, thus minimizing shoulder settlement above pavement edge drain trenches, a 200-mm (8-in.)-wide trench was excavated to four different depths: 300, 600, 900, and 1200 mm (12, 24, 36, and 48 in.). Fine filter aggregate was backfilled above a 75-mm (3-in.) inside diameter corrugated polyethylene pipe. Four compaction methods were evaluated: (a) one and two passes with a relatively low-energy modified plate compactor, (b) one and two passes with a high-energy vibratory wheel compactor, (c) one pass with a front-end loader tire, and (d) flooding with water. Sand cone densities and dynamic cone penetrometer tests were taken in each test section to determine how well the backfill was compacted. The high-energy wheel performed the best, producing satisfactory compaction to 300 mm (12 in.) with one pass and to 600 mm (24 in.) with two passes. It was the only method that actually achieved the desired target density. Slight pipe distortion was noted after two vibratory wheel passes at 300 mm (12 in.) deep, but no crushing was found. The vibratory ski performed poorly; in fact, one pass of the front-end loader tire gave generally better results than two passes with the vibratory ski. Water densification in the narrow trench was only slightly better than no compaction at all. Dynamic cone penetrometer testing generally correlated well with percent of Proctor compaction data, thus showing promise for evaluating compaction in narrow, granular-backfilled trenches.

This paper appears in Transportation Research Record No. 1425, Field Performance of Subsurface Drainage. 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

01398729

English

p. 18-27

1993

Transportation Research Record

0309055725

Figures (9) ; Photos (4) ; References (5)

Backfilling; Compaction; Cone penetrometers; Corrugated pipe; Density; Depth; Field studies; Granular materials; Plastic pipe; Soil compaction test; Subdrains

Proctor compaction test

Construction; Geotechnology; Highways; I51: Earthworks and Soil Drainage

TRIS, TRB

Jun 21 1994 12:00AM

• DETERMINATION OF FREE-DRAINING BASE MATERIALS PROPERTIES
• DRAINAGE AND BACKFILL PROVISIONS FOR APPROACHES TO BRIDGES
• FIELD AND LABORATORY COMPARISON OF PAVEMENT EDGE DRAINS IN KENTUCKY
• HYDRAULIC REQUIREMENTS OF PERMEABLE BASES
• METHODOLOGY FOR INSPECTION OF COLLECTOR SYSTEMS
• PERFORMANCE EVALUATION OF RETROFIT EDGE DRAIN PROJECTS