THE PHENOMENON OF CONTACT ZONES OF SOIL MECHANICS

The basic principles of the phenomenon are detailed and the development of practical experience in the field is recounted. Experience with a landslide in Sicily and another in a woodland adjacent to a secondary road are reviewed. The subject of reducing railside hazard is discussed and the question of finding other methods of checking potential differences found in the field is considered. A high degree of consistency was found when the potential present among bivalent and trivalent iron in between two layers was determined by means of the Nernst formula and was compared with the values determined in the field. Laboratory tests are described in which reactions appearing in nature were realistically simulated. As long as the two layers of clay (blue lying, rich in iron and brown hanging, rich in trivalent iron) are touching each other, electric potential exists. When short-circulated by a short circuit conductor, the potential drops drastically, approximately in the ratio of 60 Mv:8 MV. Soil samples as from a borehole may be taken and the prospective potential can be calculated according to the proportion of bi or trivalent iron. It is therefore possible to discover the potentials latent between different layers without direct measurements and the establish probable slip areas. Chemo-physical reaction in soil caused by the metabolism of micro-organisms may provide explanation of the reoccurrence of landslides after long rest periods. Details are given of field tests and conclusions based on test results are presented and discussed. The treatment is outlined of spritzstosse or the pumping up of wet cohesive material into ballast due to the flexing of the track close to the joints of rails, in the zone of maximum vibration. Tunnel walls in Roumania were stabilized by insertion to a depth of 250 m of 50 cm steel tie rods of 25 mm dia. An Austrian technique is also described which involves a 15 cm coating of shot concrete applied after insertion of the anchor rods.

  • Availability:
  • Corporate Authors:

    Foundation Publications Limited

    33 Short Croft
    Doddinghurst, Essex,   England 
  • Authors:
    • Veder, C
  • Publication Date: 1973-9

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 30-38
  • Serial:
    • GROUND ENGINEERING
    • Volume: 6
    • Issue Number: 5
    • Publisher: EMAP CONSTRUCT LIMITED
    • ISSN: 0017-4653

Subject/Index Terms

Filing Info

  • Accession Number: 00262274
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 22 1974 12:00AM