QUANTIFICATION OF THE DISCONTINUITIES OF ROCK AND ROCK MASSES - METHODS AND APPLICATIONS

QUANTIFICATION DES DISCONTINUITES DE LA ROCHE ET DU MASSIF ROCHEUX - METHODES ET APPLICATIONS.

The breaking up of rock may be considered on two different scales - (1) the scale of the tool which attacks and penetrates the rock' that is the scale of the miner's pick, of the toothed wheel, of the drill bit of the pneumatic drill, of the cutting edge of the ripper; it is also the scale of the test sample. (2) the scale of the rock mass within which the structure is constructed: gallery, chamber, shafts or trenches. The discontinuities affecting rock at those two levels having an important role in the process of breakdown and mechanical excavation, two methods have been developed. The first uses the rock quality index defined on the basis of measurements of wave velocity in samples. This permits the detection, the quantification and the description of discontinuities affecting the rock at the scale of the sample (porosity, micro-cracking). The second is concerned with the description of the rock mass: utilizing the possibilities offered by mathematical morphology, and texture analysis, it enables a quantitative characterisation (extension, opening) of the discontinuities to be made in so far as these affect the rock mass and the excavation for the structure on the basis of graphical representations. Examples of the application concern the mechanical excavation of rock. /TRRL/

• Corporate Authors:

  Laboratoire Central des Ponts et Chausees (LCPC)

  Boulevard Lefebvre 58
  Paris Cedex 15,   France  F-75732
• Authors:
  • Fourmaintraux, D
• Publication Date: 1975-1-2

Language

• French

Media Info

• Features: Figures; Photos; References;
• Pagination: p. 69-76
• Serial:
  • Bulletin de Liaison des Lab des Ponts et Chaussees
  • Issue Number: 75
  • Publisher: Laboratoire Central des Ponts et Chausees (LCPC)

Subject/Index Terms

• TRT Terms: Charts; Coefficients; Cracking; Crushers; Digital computers; Discrete systems; Drilling; Drills; Excavating equipment; Excavation; Excavations; Fracture mechanics; Innovation; Mass; Mathematics; Microcracking; Morphology; Mountains; Porosity; Quality control; Rocks; Samples; Shape; Sound; Speed; Structures
• Uncontrolled Terms: Breaking up; Discontinuity; Discontinuous; Quality; Rock mass
• Old TRIS Terms: Concepts; Rippers
• ITRD Terms: 3604: Breaking up; 6486: Chart; 6410: Coefficient; 5211: Cracking; 8673: Digital computer; 9015: Discontinuous; 3871: Drilling; 5155: Excavation (process); 6455: Mathematics; 4048: Mountain; 5938: Porosity; 9063: Quality; 4154: Rock; 6251: Sample (mater); 9073: Shape; 6748: Sound; 5408: Speed
• Subject Areas: Bridges and other structures; Geotechnology; Highways; I43: Rock Mechanics;

Filing Info

• Accession Number: 00168159
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Analytic
• Files: ITRD, TRIS
• Created Date: Jun 14 1978 12:00AM