DRAINAGE IN FISSURED ROCK

LES DRAINAGES DANS LES ROCHES FISSUREES

The author recalls recent results obtained in the field of rock hydraulics, especially as regards the problem of the drainage of rocks. The rock medium is assimilated to a fissured medium with a matrix of low permeability. Flows in the vicinity of a drain (cylindrical drain and drain in a draining trench) are analysed, taking cracking into account. A basic distinction is made between the drainage of the cracks and the drainage of the rock matrix. With the help of practical examples, it is shown that the optimum direction of a drainage system depends mainly on the distribution of the cracks. For a given drainage operation, the cost of the drainage system can be markedly reduced if the direction and depth of the drains are judiciously selected. The problem of drainage efficiency in rock is examined, and it is concluded that the drainage capacity of rocks is first and foremost related to the geometry of the cracks. /TRRL/

• Corporate Authors:

  Bureau de Recherches Geologiques et Minieres

  Department Documentation, B.P. 6009
  45018 Orleans,   France 
• Authors:
  • LOUIS, C
• Publication Date: 1972

Language

• French

Media Info

• Features: Figures; References;
• Pagination: p. 3-11
• Serial:
  • Bureau de Recherches Geolog & Mini, Sect III, Bltn
  • Volume: 2
  • Issue Number: 1
  • Publisher: Bureau de Recherches Geologiques et Minieres

Subject/Index Terms

• TRT Terms: Calculation; Cracking; Drainage; Flow; Fracture mechanics; Permeability; Physical properties; Pipe; Rock mechanics; Rocks; Tunneling
• Old TRIS Terms: Fissured; Rock properties
• ITRD Terms: 6464: Calculation; 5211: Cracking; 2937: Drainage; 5430: Flow (fluid); 4332: Hydrology; 5921: Permeability; 4154: Rock; 2831: Slope (terrain); 4372: Subterranean
• Subject Areas: Bridges and other structures; Geotechnology; Highways; Hydraulics and Hydrology; I26: Water Run-off - Freeze-thaw; I43: Rock Mechanics;

Filing Info

• Accession Number: 00125173
• Record Type: Publication
• Source Agency: Laboratoire Central des Ponts et Chausees (LCPC)
• Files: ITRD, TRIS
• Created Date: Nov 18 1975 12:00AM