Robert Galler

TL;DR: In this paper, a scaled rock cutting test is presented, which is designed as an attachment for hydraulic presses commonly available in rock mechanics laboratories and used to cut rock samples several times with the possibility to adjust indentation depth and spacing.

TL;DR: In this article, the authors developed a measurement method to determine the three-dimensional loading situation of a TBM disc cutter in real-time by means of the finite element method.

TL;DR: In this paper, the authors present the implementation process of the measurement method at the first TBM of the Austrian Koralm tunnel and show that peak forces are a multiple of average forces and that the distribution of forces across the tunnel face can be very irregular.

TL;DR: In this paper, an analysis of rock failure mechanisms beneath disc cutters is presented. Butler et al. conducted full-scale cutting tests to assess the global energy input in comparison with rock chips and excavated volume and found that all specimens develop lateral cracks in sufficiently confined areas whereas median cracks typically develop in boundary regions.

TL;DR: The convergence confinement method is a two-dimensional analytical method used in the design of subsurface structures and for the description of ground and system behaviour as mentioned in this paper, which is used to derive the required support measures from the combination of the following values: the ground characteristic curve, a model of the development of the radial deformations of the excavation surface in the axial direction of the tunnel, the support characteristic curve; and the installation time and location of the support measures.