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- Marine Geotechnics
- Marine Geotechnics Lab
- Dynamic Triax
Dynamic Triax
To this day, the conventional soil mechanics mainly assumed static forces on constructions within the foundation designing process.
In reality, however, it has to be dealt with time-variable load effects.For onshore construction wind and traffic loads are the essential forces which have to be taken into consideration.
For the construction of offshore structures time-variable waves, swell, tides, currents and the general sea state must be taken into account besides already mentioned wind loads. Similarly, an earthquake can act as dynamic load on the foundation (-soil) and - as the case my be - overstrain the conventionally determined maximum static load capacity of a structure.
It becomes clear that the loads and forces acting on a foundation soil can rarely be assumed as simply static ones. Especially when looking offshore, dynamic/cyclic stresses
may affect construction structures with frequencies (of sometimes large amplituedes) of about 0.05 Hz (e.g. sea state) up to 20 Hz ( e.g. earthquakes).
For these purpposes, a custom triaxial loading test which simulates cyclic and dynamic loads of 0 - 50 Hz with up to 20 kN of push (i.e. loading) force was designed and build.
In reality, however, it has to be dealt with time-variable load effects.For onshore construction wind and traffic loads are the essential forces which have to be taken into consideration.
For the construction of offshore structures time-variable waves, swell, tides, currents and the general sea state must be taken into account besides already mentioned wind loads. Similarly, an earthquake can act as dynamic load on the foundation (-soil) and - as the case my be - overstrain the conventionally determined maximum static load capacity of a structure.
It becomes clear that the loads and forces acting on a foundation soil can rarely be assumed as simply static ones. Especially when looking offshore, dynamic/cyclic stresses
may affect construction structures with frequencies (of sometimes large amplituedes) of about 0.05 Hz (e.g. sea state) up to 20 Hz ( e.g. earthquakes).
For these purpposes, a custom triaxial loading test which simulates cyclic and dynamic loads of 0 - 50 Hz with up to 20 kN of push (i.e. loading) force was designed and build.
Main Technical Components
- Real-time controller
- Controlled lateral pressure
- Pore pressure sensor
- Flow rate measurement with "back pressure"
- Hydraulic cylinder and -power unit
Technical Specifications
- Dynamic load frequency: 0-50 Hz
- Maxiumum push force of hydraulic cylinder: 20 kN
- Maxiumum stroke of hydraulic cylinder: 250 mm
- Axial piston pump, throughput of 15 l/min
- Maximal pressure of hydraulic unit: 280 bar
Typical Fields of Application
- Cyclic loading of soil samples, e.g. for simulation of foundation loads at an offshore wind mill
- Dynamic loading of soil samples, e.g. to simulate traffic loads (e.g. embankment of a railway) or at an industrial factory (e.g. heavy machinery foundation)
- Liquefaction of grained soil e.g. due to earthquake loading
Further Reading / Informative Material (german only)
