Paradela and campos novos

Brazilian Committee on Dams III Symposium on CFRD Dams Honoring J. Barry Cooke Florianópolis - SC - Brazil - 25-27 October 2007

DEFORMABILITY STUDY OF A GRANULAR MATERIAL SUBMITTED TO DIFFERENTSTRESS PATHS AIMING CFRDS

Rafael Vinícius BASSO, M.Sc – Intertechne Consultores Associados Paulo Teixeira da CRUZ, Dr.– Polytechnical Scholl of USP

INTRODUCTION
Deformations in the slab Theprincipal stresses rotate Rockfill displacements during the construction and the reservoir impounding phases Reversion on the main stresses direction

CONSTUUCTION PHASES

RESERVOIR IMPOUNDING PHASESσy > σx
σx σx σy σy

σy < σx

STRESSES STUDY
• Numerical analysis (simulation) - The trajectories of stresses obtained for different points of the rockfill
750 ponto 5 (enchimento)
750(σ paral. - σ perp.)/2 (KPa)

500

(σ paral. - σ perp.)/2 (KPa)

ponto 6 (enchimento) ponto 7 (enchimento)

500

250

ponto 8 (enchimento)

250 ponto 9 (enchimento) ponto 10 (enchimento)0 ponto 11 (enchimento) ponto 12 (enchimento)

0

-250 0 250 500 750 1000 1250 1500 1750 2000 2250 2500 2750

-250 0 250 500 750 1000 1250 1500 1750 2000 2250 2500 2750

(σ paral. + σperp.)/2 (KPa)

(σ paral. + σ perp.)/2 (KPa)

750

(σ paral. - σ perp.)/2 (KPa)

500

250 ponto 1 (enchimento) ponto 2 (enchimento) 0 ponto 3 (enchimento) ponto 4 (enchimento) -250 0 250 500 7501000 1250 1500 1750 2000 2250 2500 2750

(σ paral. + σ perp.)/2 (KPa)

LABORATORY TESTS
• Tri-triaxial equipment (Furnas Centrais Elétricas S. A.)

LABORATORY TESTS
• Loading programming forthe tri-triaxial tests – in kPa
INITIAL T YPE OF T EST Conventional Loading 1 Conventional Loading 2 Conventional Loading 3 Loading with Unloading and Reloading 1 Loading with Unloading and Reloading2 Isotropic Loading Transverse Loading 1 CONFINING STRESS 100 500 1000 INITIAL AXIAL STRESS 100 500 1000 FINAL CONFINING STRESS 100 500 1000 FINAL AXIAL STRESS Rupture* Rupture* Rupture* NOTE Axial...