DYNAMIC RESPONSE OF CONCRETE-FACED ROCKFILL DAMS TO STRONG SEISMIC EXCITATION

This paper presents a dynamic plane-strain finite-element study of the response of a typical 100-m-tall concrete-faced rockfill (CFR) dam to strong seismic shaking. The rockfill is modeled as an equivalent-linear material, whose strain-dependent shear modulus is proportional to the square root of the confining pressure. The behavior of the interface between face slab and dam is governed by Coulomb's friction law, and slippage is allowed to occur whenever the seismic shear tractions exceed the pertinent frictional capacity. Two sets of historic accelerograms are used as excitation. Numerical results highlight key aspects of the seismic response of CFR dams with emphasis on the internal forces developing in the slab. Indications are that slab distress may be produced only from axial tensile forces, developing primarily because of the rocking component of dam deformation. Not accounted for are the potentially detrimental three-dimensional narrow-canyon effects.

Language

  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 185-197
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00675500
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 6 1995 12:00AM