EVALUATION OF IN-PLACE SUBSURFACE DRAINAGE SYSTEMS IN PIERRE SHALE
Some areas of the upper depositions of Pierre Shale are fractured and lie in jointed platy layers. When these layers are exposed in open roadway cut sections, surface water tends to accululate and build up perched water tables in the roadbeds. The water build up is due to the fact that, in some areas, the platy layers are dyked off by impervious shale beds and have no free drainage outlets. Water build up, in the lower portions of roadbeds, usually result in severe warping of roadway surfaces. Underdrain systems have been placed in areas, where perched water conditions developed, to provide an outlet for the acumulated subsurface water. This study is primarily concerned with the evaluation of ten in-place subsurface drainage systems, in order to ascertain how effective these systems are in removing the surface water which percolates into the jointed shale under the roadbeds. Roughness Measurements, moisture tests and dynaflect readings indicate that the underdrains, when properly installed, have effectively removed the subsurface water. /FHWA/
- Sponsored by the Department of Transportation, Federal Highway Administration and the South Dakota Department of Transportation, Division of Highways.
Pierre, SD USA 57501
- McDonald, E B
- Publication Date: 1976
- Pagination: 33 p.
- TRT Terms: Deposition; Pavement layers; Shale; Subdrains; Subgrade (Pavements); Surface course (Pavements); Warpage; Water areas; Water table
- Uncontrolled Terms: Surface waters; Warping
- Old TRIS Terms: Deposition (Materials and soils); Subsurface drainage systems
- Subject Areas: Geotechnology; Highways; Hydraulics and Hydrology;
- Accession Number: 00185281
- Record Type: Publication
- Source Agency: Federal Highway Administration
- Report/Paper Numbers: FHWA-SD-78-5832 Tech Rpt.
- Files: TRIS, USDOT, STATEDOT
- Created Date: Mar 14 1979 12:00AM