The Norwegian University of Science and Technology NTNU and SINTEF rock mechanics laboratory has performed in-situ rock stress measurements since 1964. We have participated in various projects within water power, mines, quarries, storages, caverns, sports halls and road- and railway tunnels, included the world’s largest rock cavern for public purpose, Gjøvik Olympic Mountain Hall (62m span). SINTEFs personell have through these projects achieved unique knowledge about rock stress measurements.

Todady’s methods for rock stress measurements are in house developed and are improved techniques of the original South African CSIRO cells:

• 2D Doorstopper (overcoring)
• 3D overcoring (NTH-cell)
• Hydraulic fracturing and following impression of generated joint (also in house developed)

SINTEF gets hold of all necessary equipment inclusive core drilling machine needed for the field measurements. The equipment can be shipped as air freight. The measurement procedures are in accordance with International Society for Rock Mechanics (ISRM) suggested method for rock stress measurements.

Determination of the rock properties are performed on rock cores in laboratory. The list of tests is as follows: 

• Sound velocity
• Modulus of elasticity (Youngs modulus)
• Poissons ratio (ν)
• Uniaxial compressive strength (UCS) 
• Point load test
• Brazilian test
• Triaxial test
• Shear box test

Information regarding in-situ rock stress and rock quality is invaluable when performing numerical and empirical analyses of stability.
Additional information concerning test methods and reference projects, read the laboratory brochure.

Contact person: Trond Larsen (Tel: +47 73 59 48 57)