Influence of Joint Orientation on the Behavior of Dam Foundation Resting on Jointed Rock Mass Under Earthquake Loading Condition

Prasun Halder, Saurabh Kumar, Bappaditya Manna and K. G. Sharma
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Prasun Halder: Indian Institute of Technology Delhi, Delhi, India
Saurabh Kumar: Indian Institute of Technology Delhi, Delhi, India
Bappaditya Manna: Indian Institute of Technology Delhi, Delhi, India
K. G. Sharma: Indian Institute of Technology Delhi, Delhi, India

International Journal of Geotechnical Earthquake Engineering (IJGEE), 2019, vol. 10, issue 1, 1-16

Abstract: In this article, the effect of an intact rock foundation and foundations with different single rock joint inclinations (0°, 30°, 60°, 90°) on the dynamic response of the concrete gravity dam under strong earthquake ground motion is investigated. Discrete element analyses are carried out using UDEC to study the stress-deformation behavior of dam for two specific dynamic load combinations (LC), i.e. considering the dead weight of the dam having an empty reservoir with earthquake loading (LC-D) and considering the dead weight of the dam along with hydro-dynamic force with earthquake load (LC-E) as per IS: 6512. From the results, the compressive stresses are found maximum at the heel of the dam for LC-D and maximum at the toe for LC-E. The dam foundation with 60° joint inclination was found most critical in terms of possessing maximum compressive stresses among all other cases. Dam foundation with a horizontal (0°) set of joints exhibits maximum crest displacement and base sliding. Foundations with 60° and 90° joint sets are found to undergo lower base sliding compared to other joint sets.

Date: 2019
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