The phenomenon of collapse is described as a special case of structurally unstable soils where an unsaturated soil subjected to load suffers an additional settlement under the presence of water. In almost all cases, the process of collapse due to flooding is instantaneous or of very short duration and can produce surface settlement in the ground of up to 2 M, as has been recorded in a gypsum silt soil in Aragon (Spain). However, when the overburden process is slow and gradual (road embankments) the settlements are lower. In all cases the phenomenon of collapse is produced by the soil structure's incapacity to support new load and moisture conditions suddenly affecting it. Emphasis is placed on the mechanisms producing settlement in these soils and the internal and external factors the phenomenon creates. Among the first to be commented upon are the genetic factors and those concerning the structure (type and quantity of each of the materials present, the mineralogy and content of clay, size and shape of grains, void ratio and its size distribution, density, natural moisture content and thickness of strata involved). Among the external factors the following are considered: external loads to which the soils are subjected, the concentration and type of liquid that can reach the soil, the stress pattern involved and, finally, the possible effect of the climate. /TRRL/

  • Availability:
  • Corporate Authors:

    Laboratorio del Transporte y Mecanica del Suelo

    Alfonso XII
    Madrid, ZZ Espagne   
  • Authors:
    • Lopez, A
  • Publication Date: 1978-3-4


  • Spanish

Media Info

  • Features: Figures; References;
  • Pagination: p. 3-18
  • Serial:
    • Boletin de Informacion
    • Issue Number: 126
    • Publisher: Institute of Civilian Engineers of Spain
    • ISSN: 0210-9085

Subject/Index Terms

Filing Info

  • Accession Number: 00196700
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Sep 29 1979 12:00AM