Abstract
The ground response and site effects of a steep valley were verified with a two dimensional plane strain analysis in the time domain against recorded motions.Weak motions (<0.15 g) have been measured on the site with three accelerographs placed at the base and crests of the slopes. The instrument at the base is on rock and the ones towards the crests on soil. Dynamic models were done with the finite element method (FEM), loading at the base the signals recorded on rock. The peak ground accelerations (PGA) obtained with the FEMfit with the ones measured in situ. The comparison between the main frequencies of the events and the fundamental frequencies of the site show resonance effects. The raised amplifications were demonstrated to be caused by geological site effects, related to the upper geotechnical unit and not by the topography. These results show the importance of subsurface structure in causing resonance effects.
| Original language | English |
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| Title of host publication | 11th Congress of the International Society for Rock Mechanics |
| Subtitle of host publication | The second half century of rock mechanics, 9-13 July, 2007, Lisbon, Portugal |
| Editors | L. Ribeiro e Sousa, N. Grossmann, C. Olalla |
| Place of Publication | London |
| Publisher | Taylor & Francis |
| Pages | 1203-1207 |
| ISBN (Print) | 978-0-41545-084-3 |
| Publication status | Published - 2007 |
| Event | 11th Congress of the International Society for Rock Mechanics, ISRM 2007: The Second Half Century of Rock Mechanics - Lisbon, Portugal Duration: 9 Jul 2007 → 13 Jul 2007 Conference number: 11 |
Conference
| Conference | 11th Congress of the International Society for Rock Mechanics, ISRM 2007 |
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| Abbreviated title | ISRM |
| Country/Territory | Portugal |
| City | Lisbon |
| Period | 9/07/07 → 13/07/07 |
Keywords
- ADLIB-ART-226
- ESA
- n/a OA procedure