Migration in a Single Fracture in Granitic Rock

1983 ◽  
Vol 26 ◽  
Author(s):  
Harald Abelin ◽  
Jard Gidlund ◽  
Luis Moreno ◽  
Ivars Neretnieks
Keyword(s):  
Experimental Design ◽  
Field Data ◽  
Granitic Rock ◽  
Breakthrough Curves ◽  
Short Description ◽  
Hydrodynamic Dispersion ◽  
Single Fracture ◽  
Rock Matrix ◽  
In Situ Experiment

ABSTRACTAn in situ experiment to study migration in a single fracture in granitic rock has been performed. Both sorbing and nonsorbing tracers have been used. Results from a tracer run with a nonsorbing tracer (Uranine) are presented. The breakthrough curves have been explored with a model which takes into account hydrodynamic dispersion as well as diffusion into the rock matrix. Diffusivities and porosities of the rock matrix measured in the laboratory are used to interpret the field data. A short description of the experimental design is given. This investigation is a part of the STRIPA PROJECT phase I.

Diffusion in the Matrix of Granitic Rock Field Test in the Stripa Mine

1987 ◽  
Vol 112 ◽  
Author(s):  
Lars Birgersson ◽  
Ivars Neretnieks
Keyword(s):  
Granitic Rock ◽  
Nuclear Waste Repository ◽  
Filling Material ◽  
Rock Matrix ◽  
In Situ Experiment ◽  
Undisturbed Rock ◽  
Disturbed Zone ◽  
The Matrix ◽  
Stress Environment

AbstractThree similar migration experiments in the matrix of granitic rock are presented. The experiments have been carried out in “undisturbed” rock, that is rock under its natural stress environment. Since the experiments were performed at the 360 m level (in the Stripa Mine), the rock was subjected to nearly the same conditions as the rock surrounding a nuclear waste repository as proposed in the Swedish concept (SKB).A mixture of three non-sorbing (conservative) tracers, Uranine, Cr-EDTA and I−, were injected into the granitic rock matrix for time periods of months up to years. The subsequent overcorings of the injection holes showed that the tracers had in some cases migrated at least ≈ 400 mm (measuring limit) into the rock matrix for the experiment with the longest injection time. It could also be seen that there were large differences in migration distance into the rock matrix for samples taken fairly close to each other. One example where the tracers have diffused through fissure coating (filling) material located in “undisturbed” rock is also presented.The results from all three experiments show that all three tracers have migrated through the disturbed zone close to the injection hole, through the fissure coating material and a distance into the “undisturbed” rock matrix.These results therefore indicate that dissolved compounds may migrate into the rock matrix. This migration into the rock matrix will increase the area available for sorption of radionuclides significantly and may therefore increase the migration times for radionuclides by order(s) of magnitude.Diffusivities and hydraulic conductivities obtained in this in-situ experiment compare well with those obtained in laboratory experiments.

scholarly journals Characterization of Granitic Rock by means of the Borehore Radar. On the Result of the Measurements at the Kamaishi Mine in-situ Experiment Site.

1992 ◽  
Vol 32 (6) ◽  
pp. 304-312
Author(s):  
Takeshi SEMBA ◽  
Nobuhisa OGATA ◽  
Ken HASEGAWA ◽  
Hiroshi IWASAKI ◽  
Kunio WATANABE
Keyword(s):  
Granitic Rock ◽  
In Situ Experiment

scholarly journals From small wrinkles to Schallamach waves during rubber friction: In situ experiment and 3D simulation

2021 ◽  
Vol 96 ◽  
pp. 107084
Author(s):  
Cui Zhibo ◽  
Su Zhaoqian ◽  
Hou Dandan ◽  
Li Genzong ◽  
Wu Jian ◽  
...  
Keyword(s):  
3D Simulation ◽  
In Situ Experiment ◽  
Rubber Friction

scholarly journals Development of a novel method for the in-situ dechlorination of immovable iron elements: optimization of Cl− extraction yield through experimental design

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Marco Veneranda ◽  
Nagore Prieto-Taboada ◽  
Jose Antonio Carrero ◽  
Ilaria Costantini ◽  
Aitor Larrañaga ◽  
...  
Keyword(s):  
Experimental Design ◽  
Optimization Design ◽  
Degradation Process ◽  
Extraction Yield ◽  
Alkaline Solutions ◽  
Iron Core ◽  
Total Consumption ◽  
Iron Leaching ◽  
Novel Method

AbstractThe conservation of iron objects exposed to marine aerosol is threatened by the formation of akaganeite, a highly unstable Cl-bearing corrosion phase. As akaganeite formation is responsible of the exfoliation of the rust layer, chlorides trigger a cyclic alteration phenomenon that often ends with the total consumption of the iron core. To prevent this degradation process, movable iron elements (e.g. archaeometallurgical artefacts) are generally immersed in alkaline dechlorination baths. Aiming to transfer this successful method to the treatment of immovable iron objects, we propose the in-situ application of alkaline solutions through the use of highly absorbent wraps. As first step of this novel research line, the present work defines the best desalination solution to be used and optimizes its extraction yield. After literature review, a screening experimental design was performed to understand the single and synergic effects of common additives used for NaOH baths. Once the most effective variables were selected, an optimization design was carried out to determine the optimal conditions to be set during treatment. According to the experimental work here presented, the use of 0.7 M NaOH solutions applied at high temperatures (above 50 °C) is recommended. Indeed, these conditions enhance chloride extraction and iron leaching inhibition, while promoting corrosion stabilization.

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