Two uni-axial stress/strain devices
2 Uniaxial Compressive machines, capacity 50 kN and 500 kN.
Servo-controlled compressive machines. The control can be done with the feedback from a wide range of axial force and displacement transducers. Radial displacement and acoustic transient measurements can be performed during testing.
Laboratory of Geoscience and Engineering, Faculty of Civil Engineering and Geosciences, Stevinweg 1, Delft (building #23.
Servo-controlled compressive machine, UCS.
Unconfined compressive strength determination of rock samples, according ASTM, ISRM, and ISO standards. Also used for one-dimensional constant strain rate tests and individual particle crushing tests.
The two compressive machines are designed to be very stiff, almost no elastic deformation is in the frame for loadings up to 50 kN respectively 500 kN. Maximum axial deformation 30 mm, (travel length of the cylinder).
Research on estimation of rock strength with index testing:
W. Verwaal and A. Mulder, 1993. Estimating rock strength with the Equotip hardness tester: technical note. International Journal of Rock Mechanics and Mining Sciences and Geomechanics, 30(6): 659–662.
F. Meulenkamp, M. Alvarez Grima, Application of neural networks for the prediction of the unconfined compressive strength (UCS) from Equotip hardness. International Journal of Rock Mechanics and Mining Sciences and Geomechanics, 36(1): 29–39.
M. Alvarez Grima and R. Babuska, 1999. Fuzzy model for the prediction of unconfined compressive strength of rock samples, International Journal of Rock Mechanics and Mining Sciences and Geomechanics, 36(3):339–349.
D. Ngan-Tillard, W. Verwaal, A. Mulder, H. Engin and R. Ulusay, 2011. Application of the needle penetration test to a calcarenite, Maastricht, the Netherlands. Engineering Geology, 123(3): 214-224.
Research on impact of environmental changes on buried archaeology:
D. Ngan-Tillard, W. Verwaal, H. Huisman, and A. Muller, 2014, Resistance of buried archeological site to one-dimensional mechanical loading, IAEG XII, Torino, 2014.