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- W4301399024 abstract "Abstract When it comes to underground structures, water ingress from the surrounding formations leads to several environmental, economic and sustainability issues. To obtain the sealing, the grouting of rock fractures is done. Today, in the grouting operations, which are commonly conducted in almost all the tunnel and subsurface infrastructure projects, the pressure applied is static. This type of applied pressure might be suitable for the large fracture apertures > 100 μm, but it has been acknowledged that it is difficult to obtain sufficient penetration through smaller apertures, where filtration of cement particles starts to occur. Research is already done to overcome this issue by applying dynamic grouting pressure instead of static. It was proved that this approach erodes the formed filter cakes and improves grout penetrability in fractures below 100 μm. This research focuses on low‐frequency rectangular pressure impulse as an alternative to other methods. The goal is to improve grout spread in micro‐fractures (especially in apertures < 70 μm). During the investigation, a prototype dynamic injection equipment was built and tested under laboratory conditions. The 4 m variable aperture long slot (VALS) was used in the experiments to simulate rock fractures. The test showed better grout penetrability using dynamic pressure approach. At the current time of writing this article, preparation works are done for field test of prototype equipment at SKB Hard Rock Laboratory (HRL) at Äspö, Sweden." @default.
- W4301399024 created "2022-10-05" @default.
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- W4301399024 date "2022-10-01" @default.
- W4301399024 modified "2023-09-26" @default.
- W4301399024 title "Development of dynamic grouting under laboratory and field conditions" @default.
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- W4301399024 doi "https://doi.org/10.1002/geot.202200023" @default.
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