Abstract
The natural frequency of dam-foundation system is a function of its stiffness and the participating mass. In the present study, an attempt is made to understand the effect of rock joint orientation on the natural frequency of the dam-foundation system. Discrete element simulations are carried out using UDEC (1993) software for the intact rock foundation and rock foundations having joint inclinations of 0°, 30°, 60°, 90°, 120° and 150° with 20 m, 10 m, 5 m, 2.5 m and 1 m joint spacing in the rock mass. Results, confirm that the joint orientation affects the natural frequency of the system significantly. The natural frequency of the dam-foundation system is found higher for the intact rock foundation as compared to other jointed rock foundations. Results also reveal that the magnitude of the natural frequency of the system increases as the joint spacing increases in the rock mass.
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