Behaviour of Joints

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32-D0548/A: Detail of the shear box apparatus fitted with 5 digital gauges (4 vertical and 1 horizontal)

Rock joints originate from geological failures occurring when a break in the rock mass continuity along with no visible displacement has occurred. From a rock mechanics point of view, the discontinuities are characterized by a lower mechanical strength than the original rock matrix and require the following detailed test investigations:

• shear strength of the joint performed with the rock shear box apparatus,
• tilt test performed with the tilt test apparatus,
• surface roughness of the joint performed with the profilometer (Barton comb).