The site selected for building a new freight depot and switching yard was found completely unsuitable for building. It was decided to consolidate the soil sufficiently to enable the site to be used for rails and switches by means of a vertical and horizontal drainage system as well as by surcharge loading. First, a large number of core drillings were made to a grid pattern. Consolidation time was found to depend primarily upon the distance between the drains and to a lesser extent upon the thickness of the layer. Once the pre-tests and theoretical calculations were complete, a stabilization plan for the subsoil was decided. In order to avoid the formation of an undesireable lubricant layer on the walls of the drill holes of the vertical drains, the drilling apparatus that was used loosened the soil and transported it to the surface by means of flushing with water only. High demands were placed on the drainage sand and on the fill material used for loading and surcharge. Measurement points were placed at ten spots in the area and were equipped with porewater pressure meters, depth gages, surface gages, and water level pipes. It was thus possible to determine the connection between settlement and excess porewater pressure in the individual layers of soil. The soil stabilization process for the freight depot together with the comprehensive theoretical investigations led to the corroboration of theory with practice. It was proved that peaty soils do not adversely affect the action of vertical drains when these are properly installed. In addition these soils followed the settlement process described in the Terzaghi-Frohlich theory of consolidation. Also, it was possible to predict a high percentage of the settlement.

  • Availability:
  • Corporate Authors:

    Foundation Publications Limited

    7 Ongar Road
    Brentwood CM15 9AU, Essex,   England 
  • Authors:
    • Schumacher, E
    • Veder, C H
  • Publication Date: 1978-1

Media Info

  • Features: Figures; References;
  • Pagination: p. 20-44
  • Serial:
    • Volume: 11
    • Issue Number: 1
    • ISSN: 0017-4653

Subject/Index Terms

Filing Info

  • Accession Number: 00173890
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 31 1978 12:00AM