Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Drainability of Granular Bases for Highway Pavements
This report presents a new method for analysis of the drainage of a saturated base. Starting from basic principles of water retention and flow in porous media, this analysis leads to some new methods for the estimation of minimum degrees of saturation, drainable porosities and drainage times. This study found that current practices in the Federal Highway Administration subdrainage design manual tends to overestimate the amount of drainage from fine-grained bases and greatly underestimates the amount of drainage from coarse-grained bases. Also of importance is the ability to estimate the lowest degree of saturation that can be achieved through gravity drainage. The new methods for the analysis of pavement subdrainage are implemented in two computer programs: (1) SUBDRAIN-simulates the drainage of water from a pavement base that is initially saturated. It provides estimates of the minimum degree of saturation in the field and key drainage times. (2) SUBDRAIN-simulates the flow of water into and out the base over a period of years. The inputs include a long-term record of 15-minute rainfall data. The output shows how often the base is likely to be saturated or nearly saturated.
Drainability of Granular Bases for Highway Pavements
This report presents a new method for analysis of the drainage of a saturated base. Starting from basic principles of water retention and flow in porous media, this analysis leads to some new methods for the estimation of minimum degrees of saturation, drainable porosities and drainage times. This study found that current practices in the Federal Highway Administration subdrainage design manual tends to overestimate the amount of drainage from fine-grained bases and greatly underestimates the amount of drainage from coarse-grained bases. Also of importance is the ability to estimate the lowest degree of saturation that can be achieved through gravity drainage. The new methods for the analysis of pavement subdrainage are implemented in two computer programs: (1) SUBDRAIN-simulates the drainage of water from a pavement base that is initially saturated. It provides estimates of the minimum degree of saturation in the field and key drainage times. (2) SUBDRAIN-simulates the flow of water into and out the base over a period of years. The inputs include a long-term record of 15-minute rainfall data. The output shows how often the base is likely to be saturated or nearly saturated.
Drainability of Granular Bases for Highway Pavements
B. M. McEnRoe (Autor:in)
1994
106 pages
Report
Keine Angabe
Englisch
Highway Engineering , Construction Equipment, Materials, & Supplies , Soil & Rock Mechanics , Porous materials , Drainage , Pavement bases , Subgrades , Highway design , Pavements , Hydraulics , Road materials , Computer programs , Mathematical models , Soil mechanics , Geotechnical engineering , Drainage systems , SUBDRAIN computer program , SUBDRAIN-C computer program , Drainability
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