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Analysis of cement grout propagation in fractured rocks ; Analys och simulering av cementinjektering i sprickigt berg
Modeling of cement grout propagation in fractured rocks is important for the design, execution and monitoring of rock grouting in practice. In this project, we studied non-Newtonian cement grouts propagation in rock fractures by theoretical analyses and numerical simulations. The analytical solutions for radial flow of a Bingham fluid, between parallel plates, are analyzed and existing disagreements in the literature regarding the two different analytical solutions that are used for analysis of grouting in rock fractures is investigated. The analyses reveal that the two solutions are both zero-order approximation solutions based on different assumptions, that is with or without consideration of the vertical velocity component across the aperture. The one without considering the vertical velocity yields to a solution with radius-independent plug flow region, which largely simplifies the calculations. By using the solution with radius-independent plug flow region, Bingham grout penetration and flowrate (at the injection borehole) evolution as functions of grouting time are given for the first time. Discrepancies in the two approximation solutions for grout penetration and flowrate evolution are illustrated, showing negligible differences. The clarification of the plug flow region and evaluation of discrepancies in the two solutions presented in this work improves our confidence and simplifies modeling and design of grouting in rock engineering applications. In reality, rock fracture grouting process involves non-Newtonian fluid flow in fractures with rough surfaces, which is rarely studied in the literature. To investigate the impact of fracture surface roughness on rock fracture grouting, we presented direct numerical simulations of non-Newtonian grouts flow in single rough-walled fractures, using a regularized method (i.e., the Bingham-Papanastasiou model) to approximate the yield-stress. The rough-walled rock fracture models are created from a laser-scanned surface of a granite rock sample, to represent ...
Analysis of cement grout propagation in fractured rocks ; Analys och simulering av cementinjektering i sprickigt berg
Modeling of cement grout propagation in fractured rocks is important for the design, execution and monitoring of rock grouting in practice. In this project, we studied non-Newtonian cement grouts propagation in rock fractures by theoretical analyses and numerical simulations. The analytical solutions for radial flow of a Bingham fluid, between parallel plates, are analyzed and existing disagreements in the literature regarding the two different analytical solutions that are used for analysis of grouting in rock fractures is investigated. The analyses reveal that the two solutions are both zero-order approximation solutions based on different assumptions, that is with or without consideration of the vertical velocity component across the aperture. The one without considering the vertical velocity yields to a solution with radius-independent plug flow region, which largely simplifies the calculations. By using the solution with radius-independent plug flow region, Bingham grout penetration and flowrate (at the injection borehole) evolution as functions of grouting time are given for the first time. Discrepancies in the two approximation solutions for grout penetration and flowrate evolution are illustrated, showing negligible differences. The clarification of the plug flow region and evaluation of discrepancies in the two solutions presented in this work improves our confidence and simplifies modeling and design of grouting in rock engineering applications. In reality, rock fracture grouting process involves non-Newtonian fluid flow in fractures with rough surfaces, which is rarely studied in the literature. To investigate the impact of fracture surface roughness on rock fracture grouting, we presented direct numerical simulations of non-Newtonian grouts flow in single rough-walled fractures, using a regularized method (i.e., the Bingham-Papanastasiou model) to approximate the yield-stress. The rough-walled rock fracture models are created from a laser-scanned surface of a granite rock sample, to represent ...
Analysis of cement grout propagation in fractured rocks ; Analys och simulering av cementinjektering i sprickigt berg
Zou, Liangchao (author) / Håkansson, Ulf (author) / Cvetkovic, Vladimir (author)
2021-01-01
Paper
Electronic Resource
English
DDC:
621
Cement Grout Flow Behavior in Fractured Rock
NTIS | 1987
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Prediction of grout penetration in fractured rocks by numerical simulation
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