DYNAMIC PROPERTIES OF PIEDMONT RESIDUAL SOILS

In-situ weathering of igneous and metamorphic rocks formed Piedmont residual soils. This research paper investigates the dynamic properties--shear modulus and damping--of these soils via a combination of resonant column and torsional shear tests. The properties were evaluated with respect to confining pressure, shear strain amplitude, particle size distribution, cyclic frequency, and number of cycles. The results were compared to other findings obtained from studies reported in the literature. In total, 32 specimens of residual soils were tested. They were classified as MH, ML, SM-ML, and SM, in accordance with the Unified Soil Classification System. The normalized shear modulus and damping values were in the same range as reported by other authors for transported sands, silts, and clays. With increase in the shear strain amplitude, the normalized shear modulus decreased and damping increased at a rate faster than that for clays, but slower than that displayed by sands. The authors established an analytical model to estimate the shear modulus and the damping ratio as a function of confining pressure and shear strain amplitude for four types of Piedmont residual soils.

Language

  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 813-821
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00730002
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 29 1997 12:00AM