Hochdruck-Hochtemperatur-Triaxialprüfmaschine (HDHT)

The Hochdruck-Hochtemperatur-Triaxialprüfmaschine (HDHT) offers the possibility of investigating a wide variety of natural rocks under stress and temperature conditions that are representative of the Earth's upper crust, whose diverse sustainable use is required in the future.

The determination of static and dynamic stress-strain relationships under these conditions requires precise deformation measurement techniques and monitoring of p- and s-wave velocity by ultrasonic transmission. Simultaneous tomography of acoustic emissions allows the detection of processes in the rock structure, which nevertheless characterizes the unexplained transition from cataclastic (fracture-forming) to non-cataclastic (fracture-free) behaviour in the limit state. For this purpose, it is also necessary to be able to vary the deformation rates over a wider control range and at high lateral pressures. When CO2 is stored in deep geological formations, stationary and dynamic fluid movements occur in the rock. The test technique therefore includes a test flow with single-phase and multiphase mixtures in parallel to the thermal-mechanical stress.


Maximum punch force: 2600 kN

Maximum sheath pressure: 1400 bar

Maximum temperature: 200°C