FAILURES IN LIMESTONES IN HUMID SUBTROPICS-DISCUSSION

The case of a landslide in Miocene clayey sand in Florida is described, comments are made regarding similar landslides in the Netherlands, and questions are asked regarding the decrease of density of a sand deposit. The Florida landslide occurred in partially indurated clayey sands, in flat-lying region into which a stream valley had been eroded. The alide crater was circular, and the slide had developed by retrogressive slumping from the sides of crater towards the center. Similar landslides have occurred in silty and clayey sands along the Netherlands coast, by the banks of large rivers, and in Norwegian fjords. The similarities between the behavior of these soils and the very sensitive clays in which the same landslide mechanisms occur are due to the looseness of the resulting metastable nature of the structures of the soils. The difference between the Florida soils and other soils is age. Under normal circumstances and as the result of erosion, ground-water level fluctuations, and tectonic disturbances, it is expected that the very old sandy soils are denser and not likely to fail in comparable fashion to young loose sandy soils. The questions are asked as to why Florida's very old clayey sand exists in a loose condition, and if the dissolution of sand grains can cause the density of a sand to decrease?

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00134656
  • Record Type: Publication
  • Report/Paper Numbers: ASCE #11521
  • Files: TRIS
  • Created Date: Jun 23 1976 12:00AM