A SIMPLE SLIDING APPARATUS FOR THE MEASUREMENT OF ROCK JOINT FRICTION

An inexpensive portable apparatus is described to determine the angle of statical friction of rock joint surfaces. It consists of two hinged timber platforms so that the upper platform may be raised or lowered. The angle of the tilted platform can be measured on a scale. Sample blocks are placed with joints in contact on the movable platform, the platform is slowly raised until the upper block slides on the lower block. The angle at which sliding takes place can be measured to about + or - 0.5 degrees. A simple formula is used to calculate the shear strength of the joint. Results are given for sliding tests on wet and dry joint surfaces of upper chalk which show good correlation with other determinations of the angle of shearing resistance with respect to effective stress. The authors consider the apparatus could be used, in conjunction with careful field inspection, to study the frictional characteristics of joint surfaces. /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00168505
• Corporate Authors:

  Institution of Civil Engineers

  One Great George Street, Westminster
  London,   United Kingdom  SW1P 3AA
• Authors:
  • Cawsey, D C
  • FARRAR, N J
• Publication Date: 1976-6

Language

• English

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 382-386
• Serial:
  • GEOTECHNIQUE
  • Volume: 26
  • Issue Number: 2
  • Publisher: Thomas Telford Limited
  • ISSN: 0016-8505

Subject/Index Terms

• TRT Terms: Chalks; Equipment; Friction; Joints; Mathematical models; Measurement; Measuring instruments; Rocks; Shear strength; Strength of materials; Tests
• Old TRIS Terms: Joint
• ITRD Terms: 6155: Apparatus (measuring); 4120: Chalk; 5452: Friction; 6473: Mathematical model; 4154: Rock; 5531: Shear; 5544: Strength (mater); 6255: Test
• Subject Areas: Geotechnology; Highways; I43: Rock Mechanics;

Filing Info

• Accession Number: 00145381
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Analytic
• Files: ITRD, TRIS
• Created Date: Apr 13 1977 12:00AM