FIELD TESTS ON VERTICAL DRAINAGE OF FINE-GRAINED SOILS USING A NEW TYPE OF DRAIN
VERTIKALDRAENERING AV FINKORNIGA JORDAR MED EN NY DRAEN
Field tests have been performed on a new type of drain for fine-grained soils, the "geodrain". This is about 100 mm wide and 4 mm thick, and consists of a plastics core surrounded by wet-strength paper. The paper acts as a filter, water forced out of the clay being led away through a number of longitudinal ducts formed in the core. Geodrains are placed in the same way as ordinary sand drains. Conclusions drawn from the tests are: (1) compared with ordinary sand drains, disturbances such as strength reduction and horizontal and vertical displacements are small when geodrains are installed; (2) at a spacing of 90 cm, the consolidation coefficient of geodrains is about twice that of sand drains; the equivalent diameter of a geodrain is taken as 50 mm; (3) when geodrains spaced at 90 cm are compared with sand drains spaced at 1.5 M, the consolidation coefficients are about the same, i.e. The disturbance effects on installation of the two types of drain, have about the same influence in this case on the effectiveness of the drains; (4) the consolidation coefficient for horizontal water flow appears to be 2-3 times the coefficient for vertical flow. /TRRL/
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Corporate Authors:
Swedish Board for Technical Development
P.O. Box 43200
S-100 72 Stockholm, Sweden -
Authors:
- Torstensson, B A
- Publication Date: 1976-2
Language
- Swedish
Media Info
- Features: Figures; Photos; References;
- Pagination: 19 p.
Subject/Index Terms
- TRT Terms: Alternatives analysis; Clay; Consolidation; Consolidations; Dislocation (Geology); Drainage; Field tests; Filters; Fine grained soils; Fines (Materials); Flow; Paper; Pipe; Plastics; Soils; Streamflow; Tests; Vertical drains; Water
- Uncontrolled Terms: Vertical
- Old TRIS Terms: Consolidation rate; Horizontal displacement; Vertical flow
- ITRD Terms: 5791: Consolidation (soil); 2937: Drainage; 9023: Fine (mater); 6226: In situ; 5483: Movement; 3361: Pipe; 7454: Plastic material; 4156: Soil; 6255: Test; 9087: Vertical
- Subject Areas: Geotechnology; Highways; Hydraulics and Hydrology;
Filing Info
- Accession Number: 00174094
- Record Type: Publication
- Source Agency: Transport and Road Research Laboratory (TRRL)
- Report/Paper Numbers: Monograph
- Files: ITRD, TRIS
- Created Date: Jul 19 1978 12:00AM