By Jacques Desrues, Gioacchino Viggiani, Pierre Bésuelle
This booklet brings jointly a complete of forty eight contributions (including five keynote papers) which have been offered on the 2d foreign Workshop at the software of X-ray CT for Geomaterials (GeoX 2006) held in Aussois, France, on 4-7 October, 2006.
The contributions conceal a variety of issues, from primary characterization of fabric habit to purposes in geotechnical and geoenvironmental engineering. contemporary advances of X-ray know-how, and software program also are mentioned. As such, it will be important analyzing for somebody attracted to the applying of X-ray CT to geomaterials from either primary and utilized perspectives.Content:
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Additional resources for Advances in X-ray Tomography for Geomaterials
03 Axial strain Figure 2. Deviator stress vs. axial strain for test ESTSYN01 (10MPa confining stress, left) and test ESTSYN02 (1MPa confining stress, right) We focus now on the X-ray CT scans of specimen ESTSYN01 during loading. Figure 3 shows the reconstruction of a tomographic slice perpendicular to the specimen’s axis for each scanning step. Note that the elevation of a given slice decreases from one scan to the next, to take into account the specimen shortening during loading. Strain localization becomes visible at step 4 as a very narrow band in the upper left part of the slice.
As compared to the pre-peak increment, the zone of localized deformation appears straight (planar) both in the vertical and in the horizontal cuts. A second shear band can also be observed, which is characterized by lower values of the (incremental) shear strain. A closer scrutiny of the 3D tomographic images revealed that very close to the intersection of these two bands, in the external part of the specimen, a large inclusion of calcite and pyrite existed in the argillite. This inclusion is in fact also revealed by the green volume (a few subsets in size) which appeared on the 3D strain fields in Figure 7 (see top left and bottom right images).
1. Permeability tests Permeability tests with a triaxial apparatus and constant-rate-of-consolidation tests were conducted to clarify the macroscopic permeability of SGM. 1. 0%) was used in a series of these tests. 5wL was prepared (1016 kg/m3). 2) Air foam made of a surfactant (238 l/m3) and blast furnace cement B (75 kg/m3) were mixed with the clay for 3 minutes. 1 g/cm3. 3) Molds of Keynote lectures 61 φ50 mm × h120 mm were filled with the mixture. 4) The molds were placed in water and the specimens were allowed to cure for about 28 days.
Advances in X-ray Tomography for Geomaterials by Jacques Desrues, Gioacchino Viggiani, Pierre Bésuelle