VOLUME CHANGE OF COMPACTED CLAY FILL

Clay fill is used frequently in earth dams, commonly in road embankments and sometimes as backfill below or within structures. The clay is taken from a borrow pit with a moisture content in equilibrium with its surrounding vertical and horizontal effective stresses. After placing and compaction new stresses will exist requiring a change in equilibrium moisture content. However clay volume also alters with variations in effective stress, the clay particles changing their spacing relative to each other. The research presented deals with the volume change resulting from an increase in the equilibrium moisture content where dry clay, shales or mudstones are used as fill and subsequently become wetter. The volume changes may be incompatible with a structure or with other fill materials resulting in a differential settlement or heave. While shear failure is the main cause for concern, the secondary movements due to volume changes are a common cause of damage to earth dams and road and floor slabs. (TRRL)

Media Info

  • Features: Figures; References;
  • Pagination: p. 79-86

Subject/Index Terms

Filing Info

  • Accession Number: 00311821
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-7277-0069-3
  • Files: ITRD, TRIS
  • Created Date: Nov 19 1980 12:00AM