THE DESIGN OF PERMANENT CUTTING SLOPES IN STIFF FISSURED CLAYS

In the design of cutting slopes for permanent or 'long-term' stability in brown london clay and weathered upper lias clay, the following shear strength parameters can be used in association with the circular arc analysis: brown london clay c' = 1.5 kn/m squared, angle of shearing resistance referred to effective stress = 20 degrees; brecciated upper lias c' = 1.5 kn/m squared, angle of shearing resistance referred to effective stress = 23 degrees; fissured upper lias c' = 2 kn/m squared, angle of shearing resistance referred to effective stress = 25 degrees. These parameters apply to first-time slides. Provided that reasonably conservative values of the pore-pressure ratio are adopted the factor of safety can be 1.0 or marginally greater. Curves relating height to slope are presented, and comparisons made with nine long-term slips in brown london clay cuttings, and with eleven long-term slips in cuttings in the weathered upper lias. /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:
  • CHANDLER, R J
  • SKEMPTON, A W
• Publication Date: 1974-12

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 457-466
• Serial:
  • GEOTECHNIQUE
  • Volume: 24
  • Issue Number: 4
  • Publisher: Thomas Telford Limited
  • ISSN: 0016-8505

Subject/Index Terms

• TRT Terms: Clay; Coefficients; Cutting; Embankments; Height; Highway grades; Landslides; Pore water pressures; Safety; Safety factors; Shear strength; Slope stability; Slopes; Strength of materials; Tar
• ITRD Terms: 4177: Clay; 2812: Cutting (earthworks); 2806: Gradient; 6489: Height; 4029: Landslide; 5762: Pore water pressure; 5504: Safety coefficient; 5531: Shear; 5783: Slope stability; 5544: Strength (mater)
• Subject Areas: Geotechnology; Highways; Safety and Human Factors;

Filing Info

• Accession Number: 00125134
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Nov 18 1975 12:00AM