A major element in the site investigations the Swedish Nuclear Fuel and Waste Management Co (SKB) conducts in order to select the most suitable area to site the final repository has been the measurement of the in situ stresses. In situ stress measurement, carried out inside a few boreholes, often very scarcely placed in a large area, cannot in detail reflect the spatial distribution of the in s...

Displacements around a tunnel, occurring as a result of excavation, consist of the elastic and plastic parts. In this paper, we discuss the elastic part of displacements as a result of excavation, called net displacement. In general, the previous analytical solutions presented for determining the displacements around a circular tunnel in an elastic medium do not give the net displacements...

The evolution of internal stresses in oxide scales growing on an Fe3Al polycrystal in atmospheric air at 700 determined using in-situ energy-dispersive synchrotron x-ray diffraction. Texture analyses were performed ex-situ after 5h of oxidation at 700 the oxide scale thickness, as determined by x-ray photoelectron spectroscopy, lays between 80 and 100nm. The main phase present in the oxide scal...

Australia has a huge resource of hot dry rock, most of which is located in Central Australia. As a first step towards experimental field testing of HDR development in Australia, in-situ stresses and natural fractures in Central Australia are being characterised. Preliminary results indicate that three stress regimes may co-exist in Central Australia, with maximum horizontal in-situ stress being...

In this study acoustic emission (AE) techniques were investigated to determine in situ rock stress from rock cores. The stresses were estimated from the AE behaviour and compared with the values calculated using conventional Hollow Inclusion (HI) cells. Stresses in three different directions such as normal to bedding and parallel to the strike and dip of bedding were determined from the rock co...

Through in situ indentation of TiN in a high-resolution transmission electron microscope, the nucleation of full as well as partial dislocations has been observed from {001} and {111} surfaces, respectively. The critical elastic strains associated with the nucleation of the dislocations were analyzed from the recorded atomic displacements, and the nucleation stresses corresponding to the measur...