SLOPE STABILITY. 1: NATURAL SLOPES; PART 3: SAFETY OF STRUCTURES ON UNSTABLE SITES

STABILITE DES TALUS - 1: VERSANTS NATURELS; 3EME PARTIE: SECURITE DES OUVRAGES EN SITES INSTABLES

Two articles deal with the problem of building rigid structures on unstable sites. One of them reviews monitoring and alarm systems on unstable sites. As regards foundations, two phenomena are of particular importance: (1) The bearing capacity of shallow foundations is reduced because of the slope of the natural ground. Various calculation methods are outlined together with examples of application showing the influence of various geomechanical parameters. The case of the foundation of an engineering structure is described; it shows the precautions to be taken during earthworks to build shallow foundations. (2) When surface instability exists, the foundation must reach down to the substratum and must be protected from the stresses caused by the movement of the unstable cover. Details are given of devices which have been used in such cases. As regards retaining structures, it is shown that the loads to be counteracted if a slip is to be avoided, can reach values corresponding to passive earth pressure conditions and are therefore greater than the active earth pressure forces normally taken into account behind retaining walls. A detailed example is used to show the difficulty of stabilizing a slope with localized retaining structures even if their foundations are resting on a sound substratum. Details are given of monitoring and alarm systems to be used in the case of large-scale existing or possible slips: surface monitoring, in-depth monitoring, alarm devices using tensioned wires, spirit levels, etc. /TRRL/

• Corporate Authors:

  Laboratoire Central des Ponts et Chausees (LCPC)

  Boulevard Lefebvre 58
  Paris Cedex 15,   France  F-75732
• Authors:
  • Virollet, V
  • Pouget, P
  • LENGLET, J
• Publication Date: 1976-3

Language

• French

Media Info

• Features: Figures; Photos; References;
• Pagination: p. 149-174
• Serial:
  • Bulletin de Liaison des Lab des Ponts et Chaussees
  • Publisher: Laboratoire Central des Ponts et Chausees (LCPC)

Subject/Index Terms

• TRT Terms: Bearing capacity; Bridges; Calculation; Earth pressure; Foundations; Highway grades; Landslides; Mat foundations; Measuring instruments; Methodology; Monitoring; Retaining walls; Slope stability; Slopes; Soil mechanics; Surveillance; Warning systems
• Uncontrolled Terms: Use
• Old TRIS Terms: Foundations (Structures)
• ITRD Terms: 6155: Apparatus (measuring); 3455: Bridge; 6464: Calculation; 3377: Foundation; 2806: Gradient; 4029: Landslide; 9102: Method; 3397: Shallow foundation; 2831: Slope (terrain); 5783: Slope stability; 5755: Soil mechanics; 9101: Surveillance; 9084: Use
• Subject Areas: Bridges and other structures; Geotechnology; Highways;

Filing Info

• Accession Number: 00170327
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Jun 28 1978 12:00AM