On using the thin fluid-layer approach at ultrasonic frequencies for characterising grout propagation in an artificial fracture
2016 (English)In: International Journal of Rock Mechanics And Mining Sciences, ISSN 1365-1609, E-ISSN 1873-4545, Vol. 89, 68-74 p.Article in journal (Refereed) Published
We investigate the ultrasonic transport properties of such an idealised fracture whose 100 µm aperture is about 0.02 the wavelength, and filled with various fluids flowing under external forcing. As the artificial fracture is made of two solid and parallel walls separated by a thin fluid layer, we use the thin fluid layer concept to study the compressional (P-) wavefield transmitted across and reflected off the fracture, with no mode-conversion considered. We demonstrate that air and various fluids (water, grouts of varied w/c – water to cement ratio) can be distinguished when injected into the fracture, both at atmospheric pressure or under over-pressure as done in real grouting cases in the field. Then, using an analytical solution, we verify our experimental data and predict the results that can be obtained with a different fracture aperture. Our results illustrate that replicating such ultrasonic measurements both in space and time would allow successfully monitoring the grout propagation within an artificial fracture.
Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 89, 68-74 p.
Fracture, Grout, Monitoring, Reflection, Thin fluid layer, Ultrasonic, w/c ratio, Air, Atmospheric pressure, Grouting, Mortar, Ultrasonics, Artificial fracture, External forcing, Fracture apertures, Mode conversions, Thin fluids, Ultrasonic frequency, Water to cement (binder) ratios, Transport properties
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:kth:diva-195214DOI: 10.1016/j.ijrmms.2016.07.010ISI: 000387519300007ScopusID: 2-s2.0-84984817998OAI: oai:DiVA.org:kth-195214DiVA: diva2:1047466
FunderRock Engineering Research Foundation (BeFo)
QC 201611172016-11-172016-11-022016-12-14Bibliographically approved