Analysis of Climate Effects on Performance of Unpaved Roads
Publication: Journal of Transportation Engineering
Volume 115, Issue 4
Abstract
The performance of unpaved roads is strongly dependent upon the moisture content within the roadway profile. Unfortunately, there are no analytical models currently available for quantitatively predicting the influence of depth and time‐dependent moisture distribution upon this performance. Existing procedures rely on laboratory or field tests, or indirect empirical correlations, to define the strength characteristics of each roadway layer in terms of a single, generally conservative value intended to reflect worst‐case climatic conditions. This paper presents a rational methodology for analyzing the effects of site‐specific rainfall and evaporation history upon the performance of unpaved roads. The methodology consists of a predictive model for weather‐induced, soil‐moisture changes over time; relationships between soil moisture, compaction level, and strength for a variety of typical roadway soils; and a damage analysis model tailored to low‐volume unpaved roads. The capabilities of the proposed methodology are demonstrated through a numerical example. Performance predictions from the proposed methodology are comparable to those from more conventional approaches.
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References
1.
AASHTO guide for design of pavement structures. (1986). American Association of State and Highway Transportation Officials, Washington, D.C.
2.
Barber, V. C., Odom, E. C., and Patrick, R. W. (1978). “The deterioration and reliability of pavements.” Technical Report S‐78‐8, U.S. Army Engr. Waterways Experiment Station, Vicksburg, Miss.
3.
Brooks, R. H., and Corey, A. T. (1964). “Hydraulic properties of porous media.” Hydrology Paper 3, Colorado State Univ., Fort Collins, Colo.
4.
Campbell, G. S. (1974). “A simple method for determining unsaturated conductivity from moisture retention data.” Soil Sci., 117(6), 311–314.
5.
Clapp, R. B., and Hornberger, G. M. (1978). “Empirical equations for some soil hydraulic properties.” Water Resour. Res., 14(4), 601–604.
6.
“Damage analysis of unpaved roads.” (1987). Technical Report, prepared for The Earth Technology Corp. by Pavement Consultancy Services, Inc., Long Beach, Calif.
7.
Davis, L. A., and Neuman, S. P. (1983). “Documentation and user's guide: UNSAT2—variably saturated flow model.” Report No. NUREG/CR‐3390, U.S. Nuclear Regulatory Commission, Washington, D.C.
8.
“Evaporation atlas for the contiguous 48 united states.” (1982). NOAA Technical Report NWS 33, National Atmospheric and Oceanic Administration U.S. Dept. of Commerce, Washington, D.C.
9.
Hillel, D. (1971). Soil and water: physical principles and processes. Academic Press, Inc., New York, N.Y.
10.
Holmes, R. W., and Robertson, G. W. (1939). “A modulated soil moisture budget.” Monthly Weather Rev., Mar., 67(3), 101–105.
11.
Holtan, H. N., et al. (1968). “Moisture‐tension data for selected soils on experimental watersheds.” USDA‐ARS 41‐144, U.S. Dept. of Agric.
12.
Linsley, R. K., Jr., Kohler, M. A., and Paulhus, L. H. (1982). Hydrology for engineers. McGraw‐Hill Inc., New York, N.Y.
13.
Luhr, D. R., McCullough, B. F., and Pelzner, A. (1983). “Simplified rational pavement design procedure for low volume roads.” Transp. Res. Record, 898, 202–206.
14.
McCuen, R. H., Rawls, W. J., and Brakensiek, D. L. (1981). “Statistical analysis of the Brooks‐Corey and the Green‐Ampt parameters across soil textures.” Water Resour. Res., 17(4), 1005–1013.
15.
McCullough, B. F., and Luhr, D. R. (1979). “A pavement and management system for forest service roads—implementation.” Research Report 60, U.S. Forest Service, Washington, D.C.
16.
Neuman, S. P. (1973). “Saturated‐unsaturated seepage by finite elements.” J. Hydr. Div., ASCE, 99(12), 2233–2250.
17.
Neuman, S. P. (1975). “Galerkin approach to saturated‐unsaturated flow in porous media.” Finite elements in fluids, vol. 1: viscous flow and hydrodynamics, R. H. Gallagher et al., eds., John Wiley and Sons, Inc., New York, N.Y., 201–217.
18.
Rawls, W. J., Yates, P., and Asmussen, L. (1976). “Calibration of selected infiltration equations for the Georgia coastal plain.” USDA‐ARS‐S‐113, U.S. Dept. Agri.
19.
Viessman, W., Jr., et al. (1977). Introduction to hydrology. 2nd ed., INTEXT Educational Publishers, New York, N.Y.
Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 115 • Issue 4 • December 1989
Pages: 389 - 410
Copyright
Copyright © 1989 ASCE.
History
Published online: Dec 1, 1989
Published in print: Dec 1989
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