Deformability characteristics of quarried rockfill material
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Rockfill materials are being used widely in the construction of rockfill dam to trap river water because of their inherent flexibility, capacity to absorb large seismic energy and adoptability to various foundation conditions. Rockfill material is obtained from Pakal Dul Dam site, Jammu and Kashmir. The prototype gradation rockfill material with the maximum particle size (dmax) of 600 mm is used in the dam. For testing, the prototype gradation material is scaled down to modeled gradation with dmax of 25, 50 and 80 mm using parallel gradation technique. One Dimensional Compression (Oedometer) tests are carried out with a specimen size of 1000 mm diameter and 600 mm height with varying vertical stress (σ1) from 0.637 to 3.82 MPa. All the dmax are tested for 87% relative density (RD). Stress-strain behaviour of the modeled rockfill material is studied and presented. It is observed that the stress-strain behaviour is nonlinear and inelastic. The elastic modulus, E were determined for all the dmax and observed that the E increases with increase in maximum particle size. The coefficient of earth pressure increases with decrease in particle size. From the study, it is observed that the void ratio decreases with increase in major principal stress and it increases with decrease in maximum particle size. The permeability of the rockfill material increases with decrease in dmax. Particle breakage analyses were carried out before and after the tests and it is observed that the breakage factor increases with increase in maximum particle size.
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