FORMATION OF SHEAR ZONES IN REINFORCED SAND

The authors conducted a series of tests on reinforced sand samples using a plane-strain hollow cylindrical testing device. The samples tested developed wider shear zones than the unreinforced samples and had wider shear zones than similarly reinforced samples tested in direct-shear devices. Shear-zone width increased with increasing reinforcement concentration, reinforcement stiffness, and soil-reinforcement bond strength. By reducing displacement data to a strain basis, the authors showed that shear, elongational, compressional, and volumetric strains differ in unreinforced and reinforced samples. Dense, dilatant unreinforced sand samples developed narrow shear zones with large strains, whereas the reinforced samples developed smaller but more uniform strains distributed throughout the samples. Reorientation of zero-extension shear planes in the reinforced samples limited the range of orientations over which the reinforcements contributed to strength. Overall, findings indicate that reinforced soils deforming in uniform stress fields do not develop narrow shear zones; therefore, reinforcement contribution to strength through reorientation and mobilization of bending moments is unlikely under field conditions. For reinforcements to be loaded in tension, their orientation should be within 45 deg of the minor principal stress.

Language

  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 873-885
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00730012
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 30 1997 12:00AM