Purpose of longitudinal drains under roads and their effectiveness in lowering water table are discussed; effect of lowering water table on strength of road subgrades and on design thickness of flexible pavements in examined; it is shown that in saturated soils of low permeability, deep drains are ineffective in lowering water-table below formation level and do not significantly increase strength of soil.
Sub-soil drainage and structural design of roads
Great Britain. Ministry Transport -- Road Research Laboratory -- Report
1967
12 pages
Report
English
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