THE FAILURE OF A ROAD CONSTRUCTED ON A COLLAPSING SOIL

The occurance of damage to buildings founded on certain silty sands and residual granites due to sudden collapse of the soil structure upon inundation has come to be well recognised. It has recently become apparent that these collapsing soils can also cause damage to roads, and a case is reported where extensive settlement failures occurred on a heavily-trafficked road founded on such material. Agreement was found between the observed settlements of four or six inches and the results of computations based on both the increase of density beneath the road and the results of double consolidometer tests. Collapse extended down to a depth of three or four feet. Such soils cover wide areas in Southern Africa, and collapse could constitute an important road problem. The first essential to achieving a satisfactory design is the recognition of the soils and their inderent danger. Since this is not guaranteed by normal soil survey procedures, a number of criteria to aid recognition of such soils are given. In construction it is essential that the soil be improved to a considerable depth, and some possible construction procedures are discussed.

  • Supplemental Notes:
    • Proceedings of the 3rd Regional Conference.
  • Corporate Authors:

    Africa on Soil Mechanics and Fdn Engineering Conf

    Salisbury, ZZ Southern Rhodesia   
  • Authors:
    • Knight, K
    • Dehlen, G L
  • Conference:
  • Publication Date: 1963-6

Media Info

  • Pagination: p. 31-34

Subject/Index Terms

Filing Info

  • Accession Number: 00264642
  • Record Type: Publication
  • Source Agency: CSIR
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Jan 29 1975 12:00AM