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Title:

Parametric Study of Subsurface Drainage System of Asphalt Pavement

Accession Number:

01044081

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

Providing an adequate subsurface drainage system, including the use of a permeable base and the underdrain pipes, has been recognized as an important element in pavement design. In this paper, analysis of unsaturated water flow was carried out by a finite element software SEEP/W to compute the time to drain of various Ohio Department of Transportation specific permeable base materials in a baseline pavement configuration. A comparison was also made between the computed “time to drain” using the unsaturated flow analysis (finite element SEEP/W) and the saturated flow analysis (FHWA DRIP program). It was found that SEEP/W gives a longer time to drain than DRIP due to its ability to model pavement geometry and incorporate unsaturated hydraulic conductivity. A parametric study was also conducted using SEEP/W to investigate the effects of several important design parameters on the drainage efficiency of a subsurface drainage system. The parameters studied include the hydraulic conductivity of base and subbase layers, the thickness of the permeable base, the location of the underdrain pipes, and the cross slope of the bottom of the shoulder base. It was found that specifying the minimum required hydraulic conductivity would not be sufficient to ensure adequate drainage; other factors such as pavement geometry and the SWCC (Soil Water Characteristic Curve) also plays an important role and should be considered together with hydraulic conductivity.

Monograph Accession #:

01042056

Report/Paper Numbers:

07-2262

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Rabab'ah, Samer R
Liang, Robert Y

Pagination:

26p

Publication Date:

2007

Conference:

Transportation Research Board 86th Annual Meeting

Location: Washington DC, United States
Date: 2007-1-21 to 2007-1-25
Sponsors: Transportation Research Board

Media Type:

CD-ROM

Features:

Figures (11) ; References (15) ; Tables (4)

Geographic Terms:

Ohio

Subject Areas:

Geotechnology; Highways; Hydraulics and Hydrology; Pavements; I23: Properties of Road Surfaces; I42: Soil Mechanics

Source Data:

Transportation Research Board Annual Meeting 2007 Paper #07-2262

Files:

TRIS, TRB

Created Date:

Feb 8 2007 6:56PM