MICA DAM EMBANKMENT STRESS ANALYSIS

It is pointed out that the value of the deformation modulus has a decisive influence on the deformation and the stress transfer in the dam. The influence of deformation properties of the materials as well as the core width on the stresses and deformations in the dam and on the shear-stress of the fill materials was investigated for a 150-m high symmetrical dam (slopes 1:1.5). The construction was simulated by a series of 28 load increments. Deformation of the subsoil was not considered. The nonlinear stress-strain behavior of the materials was taken into account. The deformation modulus was determined as a function of the shear-stress for both core and shell material. Poissons ratio was assumed to be constant, v = 0.4 for the core and v = 0.3 for the shells. The overall bulk density was gamma - 2.0 Mp.m (cube). figures illustrate the stessses in the core along the axis to the top of the dam. Comments are made on the vertical stress in the core, the reduction due to stress transfer, overburden pressure. The greatest shear-stress occures in the stiff gravel zone near the core boundary. The shear strength of the gravel is however, not used more than up to 80 percent. There is no fear of shear failure. The contours of the deformation moduli show that an obvious decrease of the modulus takes place in the most shear-stressed zones. Investigation of the influence of the core width on the stress transfer and deformation showed that vertical stresses in the core are reduced less with increasing core widty. The investigation also showed how deformations and stresses change if, using the same core material, the gravel as the shell material is replaced by rockfill.

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  • Accession Number: 00133983
  • Record Type: Publication
  • Report/Paper Numbers: Proc. Paper #11162
  • Files: TRIS
  • Created Date: Jun 5 1976 12:00AM