00469704

Component

http://onlinepubs.trb.org...trr/1987/1129/1129-004.pdf

https://scholar.google.co...iang&publication_year=1987

The present bedding factors used by the clay pipe industry are dependent only on the bedding type. This practice has led to extremely conservative designs of these buried pipes and to their perceived inability of support deep covers of soil. Due to this conservative approach, clay pipe installations under deep fills were considered to be impossible and other materials have been used instead despite the many advantages clay pipe has offered for these projects. In this study, new bedding factors were predicted by the finite element analyses of buried vitrified clay pipes with four types of backfill and bedding materials. These bedding factors were calculated as the ratio of the maximum tensile strain in the computer-simulated three-edge bearing test of vitrified clay pipes to that in the finite element analyses of buried pipes. The new bedding factors are generally higher than those given in the current ASTM specifications. It is shown that the bedding factors are affected by the backfill material type and compaction density, backfill height, trench width, and pipe diameter. Design practice around the world in also summarized in this paper.

Publication of this paper sponsored by Committee on Subsurface Soil-Structure Interaction. 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

01418113

pp 31-38

1987

Transportation Research Record

030904510X

Print

Appendices (1) ; Figures (17) ; References (21) ; Tables (4)

Backfilling; Compaction; Design; Diameter; Finite element method; Forecasting; Pipe; Pipe laying; Sewers; Tension; Trenches; Underground structures; Vitrified clay; Width

Cover depth; Vitrified clay pipe

Bridges and other structures; Design; Geotechnology; Highways; I20: Design and Planning of Transport Infrastructure

TRIS, TRB, ATRI

Jul 31 1988 12:00AM

• DESIGN OF BURIED CULVERTS WITH STRESS-RELIEVING JOINTS
• PASSIVE LATERAL EARTH PRESSURE DEVELOPMENT BEHIND RIGID WALLS
• PERFORMANCE OF THIN-WALL CONCRETE PIPE
• STRUCTURAL DESIGN OF BURIED CORRUGATED POLYETHYLENE PIPES
• THE INFLUENCE OF SURROUNDING SOIL ON FLEXIBLE PIPE PERFORMANCE
• WHEEL-LOAD-INDUCED EARTH PRESSURES ON BOX CULVERTS