Abstract
It is shown by the fact of recent earthquakes that dam structures designed in accordance with
the state of the art are safe structures. For such safe dam design it is necessary to account for
the loading in an appropriate way together with the geotechnical site conditions. Based on
these, the optimum layout of the structure can be found. For the dynamic loading of the dam
structure intensive site specific investigations are needed. The interaction with the abutment is
in most cases approximated by means of rigid body models.
To account for the dynamic interaction a more elaborated model is investigated based on
calculations and results from the ICOLD "10 th Benchmark Workshop on Numerical Analysis
of Dams". For this the orographic left rock wedge in the abutment of the Luzzone Dam is
discretized within a numerical arch dam model accounting for the wedge mass gravitational
forces. Time histories of accelerations are applied and fluid structure interaction is accounted
for with added mass approach compared against fluid elements.
The investigations on the stability are carried out within the finite element model and – with
the time history of the dam thrust acting onto the wedge – with the Londe method. The results
of the calculations are compared with respect to different distributions of the pore water
pressure in the contact between rock wedge and underlying rock. It is to conclude that more
sophisticated, realistic models show higher margins to entire system failure, which
anticipates, that the existing model assumptions are conservative – as it is assumed
the state of the art are safe structures. For such safe dam design it is necessary to account for
the loading in an appropriate way together with the geotechnical site conditions. Based on
these, the optimum layout of the structure can be found. For the dynamic loading of the dam
structure intensive site specific investigations are needed. The interaction with the abutment is
in most cases approximated by means of rigid body models.
To account for the dynamic interaction a more elaborated model is investigated based on
calculations and results from the ICOLD "10 th Benchmark Workshop on Numerical Analysis
of Dams". For this the orographic left rock wedge in the abutment of the Luzzone Dam is
discretized within a numerical arch dam model accounting for the wedge mass gravitational
forces. Time histories of accelerations are applied and fluid structure interaction is accounted
for with added mass approach compared against fluid elements.
The investigations on the stability are carried out within the finite element model and – with
the time history of the dam thrust acting onto the wedge – with the Londe method. The results
of the calculations are compared with respect to different distributions of the pore water
pressure in the contact between rock wedge and underlying rock. It is to conclude that more
sophisticated, realistic models show higher margins to entire system failure, which
anticipates, that the existing model assumptions are conservative – as it is assumed
| Original language | English |
|---|---|
| Title of host publication | Failure Mechanisms and Determination of Parameters |
| Place of Publication | Salzburg |
| Publisher | GEOAUSTRIA |
| Number of pages | 8 |
| Publication status | Accepted/In press - 2011 |
| Event | Calculation Methods in Geotechnics - Salzburg, Austria Duration: 12 Sept 2012 → 12 Sept 2012 |
Conference
| Conference | Calculation Methods in Geotechnics |
|---|---|
| Country/Territory | Austria |
| City | Salzburg |
| Period | 12/09/12 → 12/09/12 |
Fields of Expertise
- Sustainable Systems
Treatment code (Nähere Zuordnung)
- Theoretical
- Review