FRACTURE STRESSES INDUCED BY ROCK SPLITTERS

To complement field experimentation in the use of mechanical rock splitters for rapid excavation, an analysis of the stress distribution around a hole was made by means of the Airy stress function for two assumed pressure distributions. These were chosen to simulate the probable pressure distribution caused by a rock splitter, i.e. by two feathers separated by a hydraulically activated wedge. An induced stress factor of 1.0 was obtained for an even function P sin2 theta, and of 1.65 for a Fourier series function. Results show that the design of feathers is a critical factor in determining the magnitude and distribution of stresses.(a) /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00207624
• Corporate Authors:

  Pergamon Press, Incorporated

  Headington Hill Hall
  Oxford OX30BW,    
• Authors:
  • Chollette, D
  • Clark, G B
  • Lehnhoff, T F
• Publication Date: 1976-10

Language

• English

Media Info

• Features: Figures; References;
• Pagination: p. 281-287
• Serial:
  • International Journal of Rock Mechanics and Mining Science
  • Volume: 13
  • Issue Number: 10
  • Publisher: Pergamon Press, Incorporated
  • ISSN: 0020-7624

Subject/Index Terms

• TRT Terms: Drilling; Equipment; Excavation; Excavations; Fourier series; Fracture mechanics; Hydraulic fluids; Hydraulics; Mathematical analysis; Pressure; Rocks; Splitting (Communications); Stresses
• Uncontrolled Terms: Fracture; Pressure distribution; Quick
• Old TRIS Terms: Splitting
• ITRD Terms: 4577: Aggregate; 2894: Alignment; 6471: Analysis (math); 5711: Bore hole; 224: Cost; 2812: Cutting (earthworks); 2937: Drainage; 3871: Drilling; 2801: Embankment; 3674: Equipment; 5275: Erosion; 5155: Excavation (process); 3377: Foundation; 4101: Granite; 2855: Highway design; 5431: Hydraulics (fluid); 2752: Motorway; 4048: Mountain; 5412: Pressure; 9149: Prevention; 9064: Quick; 8092: Republic of Korea; 1053: Road network; 4154: Rock; 5731: Seismic; 5722: Site investigation; 5575: Stress (in material); 2950: Subgrade; 4025: Surveying (land); 4059: Valley
• Subject Areas: Bridges and other structures; Construction; Geotechnology; Highways; I43: Rock Mechanics; I54: Construction of Tunnels;

Filing Info

• Accession Number: 00149025
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Analytic
• Files: ITRD, TRIS
• Created Date: Jun 17 1977 12:00AM