Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Earthquakes and Structures Volume 30, Number 6, June 2026 , pages 751-775 DOI: https://doi.org/10.12989/eas.2026.30.6.751 |
|
|
|
Behaviour of dam foundation due to stratification and interaction effects during seismic events |
||
Aditya Krishna Bandi, Shrabony Adhikary
|
||
| Abstract | ||
| The present study examines the seismic response of a Dam-Reservoir-Layered Foundation (DRLF) system with varying foundation layer depths. The foundation behaviour due to the stratification, interaction effects and site amplification is also investigated. Three configurations (S1, S2, and S3) with different foundation depths and the same foundation width across all systems are analysed, each further modified with distinct layer arrangements (C1, C2, and C3) for soft, medium, and unweathered rock layers. Non-linear time-history analyses were performed using 11 spectrum-compatible ground motions. The target PGA is determined through deterministic seismic hazard analysis, using the response spectrum from IS 1893: Part 1-2016. Results indicate significant variation in the DRLF system's response with changes in foundation layer depth. Interestingly, a soft layer at the surface amplifies the dam's response compared to other configurations. A proportional decrease in response parameters has been observed with increasing foundation depth. This demonstrates that seismic amplification is more prominent in shallower foundations than in deeper ones. | ||
| Key Words | ||
| concrete gravity dam; damage assessment; dynamic analysis; nonlinear analysis; numerical simulation; seismic response | ||
| Address | ||
| Department of Civil Engineering, Visvesvaraya National Institute of Technology, Nagpur 440010, India | ||